From d930e122854358d99220a980e6a27382c22ad9a5 Mon Sep 17 00:00:00 2001
From: crusaderky <crusaderky@gmail.com>
Date: Wed, 17 Dec 2025 09:18:22 +0000
Subject: [PATCH 01/15] pixi builds for free-threading and tsan

---
 Tools/pixi-packages/README.md                 |  8 ++-
 Tools/pixi-packages/build.sh                  | 12 +++-
 Tools/pixi-packages/free-threading/pixi.toml  |  8 +++
 .../pixi-packages/free-threading/recipe.yaml  | 63 +++++++++++++++++++
 Tools/pixi-packages/tsan/pixi.toml            |  8 +++
 Tools/pixi-packages/tsan/recipe.yaml          | 63 +++++++++++++++++++
 6 files changed, 157 insertions(+), 5 deletions(-)
 create mode 100644 Tools/pixi-packages/free-threading/pixi.toml
 create mode 100644 Tools/pixi-packages/free-threading/recipe.yaml
 create mode 100644 Tools/pixi-packages/tsan/pixi.toml
 create mode 100644 Tools/pixi-packages/tsan/recipe.yaml

diff --git a/Tools/pixi-packages/README.md b/Tools/pixi-packages/README.md
index 50c3315ac0e5fc..049f38b06b93d0 100644
--- a/Tools/pixi-packages/README.md
+++ b/Tools/pixi-packages/README.md
@@ -12,7 +12,7 @@ python = { git = "https://github.com/python/cpython", subdirectory = "Tools/pixi
 ```
 
 This is particularly useful when developers need to build CPython from source
-(for example, for an ASan-instrumented build), as it does not require any manual
+(for example, for an ASan or TSan-instrumented build), as it does not require any manual
 clone or build steps. Instead, Pixi will automatically handle both the build
 and installation of the package.
 
@@ -20,7 +20,9 @@ Each package definition is contained in a subdirectory, but they share the build
 `build.sh` in this directory. Currently defined package variants:
 
 - `default`
-- `asan`: ASan-instrumented build with `PYTHON_ASAN=1`
+- `free-threading`
+- `asan`: ASan-instrumented build
+- `tsan`: free-threading, TSan-instrumented build
 
 ## Maintenance
 
@@ -30,7 +32,7 @@ Each package definition is contained in a subdirectory, but they share the build
 
 ## Opportunities for future improvement
 
-- More package variants (such as TSan, UBSan)
+- More package variants (such as UBSan)
 - Support for Windows
 - Using a single `pixi.toml` and `recipe.yaml` for all package variants is blocked on https://github.com/prefix-dev/pixi/issues/4599
 - A workaround can be removed from the build script once https://github.com/prefix-dev/rattler-build/issues/2012 is resolved
diff --git a/Tools/pixi-packages/build.sh b/Tools/pixi-packages/build.sh
index 120f1d6bb0088a..6fe9b4ba50c662 100644
--- a/Tools/pixi-packages/build.sh
+++ b/Tools/pixi-packages/build.sh
@@ -1,11 +1,19 @@
 #!/bin/bash
 
-if [[ "${PYTHON_VARIANT}" == "asan" ]]; then
+if [[ "${PYTHON_VARIANT}" == "free-threading" ]]; then
+    echo "BUILD TYPE: FREE-THREADING"
+    BUILD_DIR="../build_free_threading"
+    CONFIGURE_EXTRA="--disable-gil"
+elif [[ "${PYTHON_VARIANT}" == "asan" ]]; then
     echo "BUILD TYPE: ASAN"
     BUILD_DIR="../build_asan"
     CONFIGURE_EXTRA="--with-address-sanitizer"
-    export PYTHON_ASAN="1"
     export ASAN_OPTIONS="strict_init_order=true"
+elif [[ "${PYTHON_VARIANT}" == "tsan" ]]; then
+    echo "BUILD TYPE: TSAN"
+    BUILD_DIR="../build_tsan"
+    CONFIGURE_EXTRA="--disable-gil --with-thread-sanitizer"
+    export TSAN_OPTIONS="suppressions=${SRC_DIR}/Tools/tsan/suppressions_free_threading.txt"
 else
     echo "BUILD TYPE: DEFAULT"
     BUILD_DIR="../build"
diff --git a/Tools/pixi-packages/free-threading/pixi.toml b/Tools/pixi-packages/free-threading/pixi.toml
new file mode 100644
index 00000000000000..001ff78fa5d8cb
--- /dev/null
+++ b/Tools/pixi-packages/free-threading/pixi.toml
@@ -0,0 +1,8 @@
+[workspace]
+channels = ["https://prefix.dev/conda-forge"]
+platforms = ["osx-arm64", "linux-64"]
+preview = ["pixi-build"]
+
+[package.build.backend]
+name = "pixi-build-rattler-build"
+version = "*"
diff --git a/Tools/pixi-packages/free-threading/recipe.yaml b/Tools/pixi-packages/free-threading/recipe.yaml
new file mode 100644
index 00000000000000..61c01562d35519
--- /dev/null
+++ b/Tools/pixi-packages/free-threading/recipe.yaml
@@ -0,0 +1,63 @@
+context:
+  # Keep up to date
+  version: "3.15"
+
+package:
+  name: python
+  version: ${{ version }}
+
+source:
+  - path: ../../..
+
+build:
+  files:
+    exclude:
+      - "*.o"
+  script:
+    file: ../build.sh
+    env:
+      PYTHON_VARIANT: "free-threading"
+
+# derived from https://github.com/conda-forge/python-feedstock/blob/main/recipe/meta.yaml
+requirements:
+  build:
+    - ${{ compiler('c') }}
+    - ${{ compiler('cxx') }}
+    - make
+    - pkg-config
+    # configure script looks for llvm-ar for lto
+    - if: osx
+      then:
+        - llvm-tools
+    - if: linux
+      then:
+        - ld_impl_${{ target_platform }}
+        - binutils_impl_${{ target_platform }}
+    - clang-19
+    - llvm-tools-19
+
+  host:
+    - bzip2
+    - sqlite
+    - liblzma-devel
+    - zlib
+    - zstd
+    - openssl
+    - readline
+    - tk
+    # These two are just to get the headers needed for tk.h, but is unused
+    - xorg-libx11
+    - xorg-xorgproto
+    - ncurses
+    - libffi
+    - if: linux
+      then:
+        - ld_impl_${{ target_platform }}
+        - libuuid
+    - libmpdec-devel
+    - expat
+
+about:
+  homepage: https://www.python.org/
+  license: Python-2.0
+  license_file: LICENSE
diff --git a/Tools/pixi-packages/tsan/pixi.toml b/Tools/pixi-packages/tsan/pixi.toml
new file mode 100644
index 00000000000000..001ff78fa5d8cb
--- /dev/null
+++ b/Tools/pixi-packages/tsan/pixi.toml
@@ -0,0 +1,8 @@
+[workspace]
+channels = ["https://prefix.dev/conda-forge"]
+platforms = ["osx-arm64", "linux-64"]
+preview = ["pixi-build"]
+
+[package.build.backend]
+name = "pixi-build-rattler-build"
+version = "*"
diff --git a/Tools/pixi-packages/tsan/recipe.yaml b/Tools/pixi-packages/tsan/recipe.yaml
new file mode 100644
index 00000000000000..f036cac180d22f
--- /dev/null
+++ b/Tools/pixi-packages/tsan/recipe.yaml
@@ -0,0 +1,63 @@
+context:
+  # Keep up to date
+  version: "3.15"
+
+package:
+  name: python
+  version: ${{ version }}
+
+source:
+  - path: ../../..
+
+build:
+  files:
+    exclude:
+      - "*.o"
+  script:
+    file: ../build.sh
+    env:
+      PYTHON_VARIANT: "tsan"
+
+# derived from https://github.com/conda-forge/python-feedstock/blob/main/recipe/meta.yaml
+requirements:
+  build:
+    - ${{ compiler('c') }}
+    - ${{ compiler('cxx') }}
+    - make
+    - pkg-config
+    # configure script looks for llvm-ar for lto
+    - if: osx
+      then:
+        - llvm-tools
+    - if: linux
+      then:
+        - ld_impl_${{ target_platform }}
+        - binutils_impl_${{ target_platform }}
+    - clang-19
+    - llvm-tools-19
+
+  host:
+    - bzip2
+    - sqlite
+    - liblzma-devel
+    - zlib
+    - zstd
+    - openssl
+    - readline
+    - tk
+    # These two are just to get the headers needed for tk.h, but is unused
+    - xorg-libx11
+    - xorg-xorgproto
+    - ncurses
+    - libffi
+    - if: linux
+      then:
+        - ld_impl_${{ target_platform }}
+        - libuuid
+    - libmpdec-devel
+    - expat
+
+about:
+  homepage: https://www.python.org/
+  license: Python-2.0
+  license_file: LICENSE

From 57d45b97a63eff8e14287f8ff01ffa41641a52fa Mon Sep 17 00:00:00 2001
From: crusaderky <crusaderky@gmail.com>
Date: Fri, 2 Jan 2026 15:25:13 +0000
Subject: [PATCH 02/15] Rename to tsan-free-threading

---
 Tools/pixi-packages/README.md                               | 2 +-
 Tools/pixi-packages/build.sh                                | 6 +++---
 Tools/pixi-packages/{tsan => tsan-free-threading}/pixi.toml | 0
 .../pixi-packages/{tsan => tsan-free-threading}/recipe.yaml | 2 +-
 4 files changed, 5 insertions(+), 5 deletions(-)
 rename Tools/pixi-packages/{tsan => tsan-free-threading}/pixi.toml (100%)
 rename Tools/pixi-packages/{tsan => tsan-free-threading}/recipe.yaml (96%)

diff --git a/Tools/pixi-packages/README.md b/Tools/pixi-packages/README.md
index 049f38b06b93d0..c5fc4a1af15c21 100644
--- a/Tools/pixi-packages/README.md
+++ b/Tools/pixi-packages/README.md
@@ -22,7 +22,7 @@ Each package definition is contained in a subdirectory, but they share the build
 - `default`
 - `free-threading`
 - `asan`: ASan-instrumented build
-- `tsan`: free-threading, TSan-instrumented build
+- `tsan-free-threading`: TSan-instrumented free-threading build
 
 ## Maintenance
 
diff --git a/Tools/pixi-packages/build.sh b/Tools/pixi-packages/build.sh
index 6fe9b4ba50c662..b2bceda779f2cc 100644
--- a/Tools/pixi-packages/build.sh
+++ b/Tools/pixi-packages/build.sh
@@ -9,9 +9,9 @@ elif [[ "${PYTHON_VARIANT}" == "asan" ]]; then
     BUILD_DIR="../build_asan"
     CONFIGURE_EXTRA="--with-address-sanitizer"
     export ASAN_OPTIONS="strict_init_order=true"
-elif [[ "${PYTHON_VARIANT}" == "tsan" ]]; then
-    echo "BUILD TYPE: TSAN"
-    BUILD_DIR="../build_tsan"
+elif [[ "${PYTHON_VARIANT}" == "tsan-free-threading" ]]; then
+    echo "BUILD TYPE: TSAN FREE-THREADING"
+    BUILD_DIR="../build_tsan_free_threading"
     CONFIGURE_EXTRA="--disable-gil --with-thread-sanitizer"
     export TSAN_OPTIONS="suppressions=${SRC_DIR}/Tools/tsan/suppressions_free_threading.txt"
 else
diff --git a/Tools/pixi-packages/tsan/pixi.toml b/Tools/pixi-packages/tsan-free-threading/pixi.toml
similarity index 100%
rename from Tools/pixi-packages/tsan/pixi.toml
rename to Tools/pixi-packages/tsan-free-threading/pixi.toml
diff --git a/Tools/pixi-packages/tsan/recipe.yaml b/Tools/pixi-packages/tsan-free-threading/recipe.yaml
similarity index 96%
rename from Tools/pixi-packages/tsan/recipe.yaml
rename to Tools/pixi-packages/tsan-free-threading/recipe.yaml
index f036cac180d22f..dfae06ad7a51d5 100644
--- a/Tools/pixi-packages/tsan/recipe.yaml
+++ b/Tools/pixi-packages/tsan-free-threading/recipe.yaml
@@ -16,7 +16,7 @@ build:
   script:
     file: ../build.sh
     env:
-      PYTHON_VARIANT: "tsan"
+      PYTHON_VARIANT: "tsan-free-threading"
 
 # derived from https://github.com/conda-forge/python-feedstock/blob/main/recipe/meta.yaml
 requirements:

From 5ff29b41afa3d0f56035600ee901d325a093ee12 Mon Sep 17 00:00:00 2001
From: crusaderky <crusaderky@gmail.com>
Date: Fri, 2 Jan 2026 15:25:27 +0000
Subject: [PATCH 03/15] Add libclang_rt hack

---
 Tools/pixi-packages/build.sh | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/Tools/pixi-packages/build.sh b/Tools/pixi-packages/build.sh
index b2bceda779f2cc..8926de2603846f 100644
--- a/Tools/pixi-packages/build.sh
+++ b/Tools/pixi-packages/build.sh
@@ -41,5 +41,6 @@ ln -sf "${PREFIX}/bin/python3" "${PREFIX}/bin/python"
 
 # https://github.com/prefix-dev/rattler-build/issues/2012
 if [[ ${OSTYPE} == "darwin"* ]]; then
-    cp "${BUILD_PREFIX}/lib/clang/21/lib/darwin/libclang_rt.asan_osx_dynamic.dylib" "${PREFIX}/lib/libclang_rt.asan_osx_dynamic.dylib"
+    cp "${BUILD_PREFIX}/lib/clang/21/lib/darwin/libclang_rt.asan_osx_dynamic.dylib" "${PREFIX}/lib/"
+    cp "${BUILD_PREFIX}/lib/clang/21/lib/darwin/libclang_rt.tsan_osx_dynamic.dylib" "${PREFIX}/lib/"
 fi

From 9a2a8963286077536f67b89a2123355aeb049a3d Mon Sep 17 00:00:00 2001
From: crusaderky <crusaderky@gmail.com>
Date: Fri, 2 Jan 2026 16:02:29 +0000
Subject: [PATCH 04/15] Add troubleshooting for tsan

---
 Tools/pixi-packages/README.md | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/Tools/pixi-packages/README.md b/Tools/pixi-packages/README.md
index c5fc4a1af15c21..94d606cee3439d 100644
--- a/Tools/pixi-packages/README.md
+++ b/Tools/pixi-packages/README.md
@@ -36,3 +36,18 @@ Each package definition is contained in a subdirectory, but they share the build
 - Support for Windows
 - Using a single `pixi.toml` and `recipe.yaml` for all package variants is blocked on https://github.com/prefix-dev/pixi/issues/4599
 - A workaround can be removed from the build script once https://github.com/prefix-dev/rattler-build/issues/2012 is resolved
+
+## Troubleshooting
+
+TSan builds may crash on Linux with
+```
+FATAL: ThreadSanitizer: unexpected memory mapping 0x7977bd072000-0x7977bd500000
+```
+To fix it, try reducing `mmap_rnd_bits`:
+
+```bash
+$ sudo sysctl vm.mmap_rnd_bits
+vm.mmap_rnd_bits = 32  # too high for TSan
+$ sudo sysctl vm.mmap_rnd_bits=28  # reduce it
+vm.mmap_rnd_bits = 28
+```

From 97979e08317e44e3473252196f6d9243ae31e4df Mon Sep 17 00:00:00 2001
From: Isuru Fernando <isuruf@gmail.com>
Date: Thu, 8 Jan 2026 12:59:30 -0800
Subject: [PATCH 05/15] Add python_abi output and refactor

- Remove clang-19 since we are not building the experimental jit
- Remove ld_impl because we are not hacking the makefiles
- Add site_packages_path
- Make recipe.yaml identical with just the variant name difference
- Add a generate.sh to generate recipe.yaml from default variant
- Add a runtime requirement of libsanitizer for gcc
---
 Tools/pixi-packages/asan/recipe.yaml          | 121 +++++++++++-------
 Tools/pixi-packages/build.sh                  |   1 +
 Tools/pixi-packages/default/recipe.yaml       | 117 ++++++++++-------
 .../pixi-packages/free-threading/recipe.yaml  | 121 +++++++++++-------
 Tools/pixi-packages/generate.sh               |  12 ++
 Tools/pixi-packages/recipe.yaml               |  88 +++++++++++++
 .../tsan-free-threading/recipe.yaml           | 121 +++++++++++-------
 7 files changed, 392 insertions(+), 189 deletions(-)
 create mode 100644 Tools/pixi-packages/generate.sh
 create mode 100644 Tools/pixi-packages/recipe.yaml

diff --git a/Tools/pixi-packages/asan/recipe.yaml b/Tools/pixi-packages/asan/recipe.yaml
index dea88394ad9fe2..e27e5235fc554d 100644
--- a/Tools/pixi-packages/asan/recipe.yaml
+++ b/Tools/pixi-packages/asan/recipe.yaml
@@ -1,61 +1,86 @@
 context:
   # Keep up to date
   version: "3.15"
+  variant: "asan"
+  freethreading_tag: ${{ "t" if "free-threading" in variant else "" }}
+  abi_tag: cp${{ version | split(".") | join("") }}${{ freethreading_tag }}
 
-package:
+recipe:
   name: python
-  version: ${{ version }}
 
 source:
   - path: ../../..
 
-build:
-  files:
-    exclude:
-      - "*.o"
-  script:
-    file: ../build.sh
-    env:
-      PYTHON_VARIANT: "asan"
-
-# derived from https://github.com/conda-forge/python-feedstock/blob/main/recipe/meta.yaml
-requirements:
+outputs:
+- package:
+    name: python_abi
+    version: ${{ version }}
   build:
-    - ${{ compiler('c') }}
-    - ${{ compiler('cxx') }}
-    - make
-    - pkg-config
-    # configure script looks for llvm-ar for lto
-    - if: osx
-      then:
-        - llvm-tools
-    - if: linux
-      then:
-        - ld_impl_${{ target_platform }}
-        - binutils_impl_${{ target_platform }}
-    - clang-19
-    - llvm-tools-19
-
-  host:
-    - bzip2
-    - sqlite
-    - liblzma-devel
-    - zlib
-    - zstd
-    - openssl
-    - readline
-    - tk
-    # These two are just to get the headers needed for tk.h, but is unused
-    - xorg-libx11
-    - xorg-xorgproto
-    - ncurses
-    - libffi
-    - if: linux
-      then:
-        - ld_impl_${{ target_platform }}
-        - libuuid
-    - libmpdec-devel
-    - expat
+    string: "0_cp35"
+  requirements:
+    run_constraints:
+      - python ${{ version }}.* *_cp35
+
+- package:
+    name: python
+    version: ${{ version }}
+  build:
+    string: "0_cp35"
+    files:
+      exclude:
+        - "*.o"
+    script:
+      file: ../build.sh
+      env:
+        PYTHON_VARIANT: ${{ variant }}
+    python:
+      site_packages_path: "lib/python${{ version }}${{ freethreading_tag }}/site-packages"
+
+  # derived from https://github.com/conda-forge/python-feedstock/blob/main/recipe/meta.yaml
+  requirements:
+    build:
+      - ${{ compiler('c') }}
+      - ${{ compiler('cxx') }}
+      - make
+      - pkg-config
+      # configure script looks for llvm-ar for lto
+      - if: osx
+        then:
+          - llvm-tools
+
+    host:
+      - bzip2
+      - sqlite
+      - liblzma-devel
+      - zlib
+      - zstd
+      - openssl
+      - readline
+      - tk
+      # These two are just to get the headers needed for tk.h, but is unused
+      - xorg-libx11
+      - xorg-xorgproto
+      - ncurses
+      - libffi
+      - if: linux
+        then:
+          - libuuid
+      - libmpdec-devel
+      - expat
+      - if: c_compiler == "gcc" and "san" in variant
+        then:
+          - libsanitizer
+
+    ignore_run_exports:
+      from_package:
+        - xorg-libx11
+        - xorg-xorgproto
+
+    run_exports:
+      noarch:
+        - python
+      weak:
+        - python_abi ${{ version }}.* *_cp${{ version | split(".") | join("") }}${{ freethreading_tag }}
 
 about:
   homepage: https://www.python.org/
diff --git a/Tools/pixi-packages/build.sh b/Tools/pixi-packages/build.sh
index 8926de2603846f..6332ef15564a6a 100644
--- a/Tools/pixi-packages/build.sh
+++ b/Tools/pixi-packages/build.sh
@@ -31,6 +31,7 @@ else
         --oldincludedir="${BUILD_PREFIX}/${HOST}/sysroot/usr/include" \
         --enable-shared \
         --srcdir="${SRC_DIR}" \
+        --with-system-expat \
         ${CONFIGURE_EXTRA}
 fi
 
diff --git a/Tools/pixi-packages/default/recipe.yaml b/Tools/pixi-packages/default/recipe.yaml
index eeb4052ec3859c..93d6c664d6ec4e 100644
--- a/Tools/pixi-packages/default/recipe.yaml
+++ b/Tools/pixi-packages/default/recipe.yaml
@@ -1,59 +1,86 @@
 context:
   # Keep up to date
   version: "3.15"
+  variant: "default"
+  freethreading_tag: ${{ "t" if "free-threading" in variant else "" }}
+  abi_tag: cp${{ version | split(".") | join("") }}${{ freethreading_tag }}
 
-package:
+recipe:
   name: python
-  version: ${{ version }}
 
 source:
   - path: ../../..
 
-build:
-  files:
-    exclude:
-      - "*.o"
-  script:
-    file: ../build.sh
+outputs:
+- package:
+    name: python_abi
+    version: ${{ version }}
+  build:
+    string: "0_cp35"
+  requirements:
+    run_constraints:
+      - python ${{ version }}.* *_cp35
 
-# derived from https://github.com/conda-forge/python-feedstock/blob/main/recipe/meta.yaml
-requirements:
+- package:
+    name: python
+    version: ${{ version }}
   build:
-    - ${{ compiler('c') }}
-    - ${{ compiler('cxx') }}
-    - make
-    - pkg-config
-    # configure script looks for llvm-ar for lto
-    - if: osx
-      then:
-        - llvm-tools
-    - if: linux
-      then:
-        - ld_impl_${{ target_platform }}
-        - binutils_impl_${{ target_platform }}
-    - clang-19
-    - llvm-tools-19
-
-  host:
-    - bzip2
-    - sqlite
-    - liblzma-devel
-    - zlib
-    - zstd
-    - openssl
-    - readline
-    - tk
-    # These two are just to get the headers needed for tk.h, but is unused
-    - xorg-libx11
-    - xorg-xorgproto
-    - ncurses
-    - libffi
-    - if: linux
-      then:
-        - ld_impl_${{ target_platform }}
-        - libuuid
-    - libmpdec-devel
-    - expat
+    string: "0_cp35"
+    files:
+      exclude:
+        - "*.o"
+    script:
+      file: ../build.sh
+      env:
+        PYTHON_VARIANT: ${{ variant }}
+    python:
+      site_packages_path: "lib/python${{ version }}${{ freethreading_tag }}/site-packages"
+
+  # derived from https://github.com/conda-forge/python-feedstock/blob/main/recipe/meta.yaml
+  requirements:
+    build:
+      - ${{ compiler('c') }}
+      - ${{ compiler('cxx') }}
+      - make
+      - pkg-config
+      # configure script looks for llvm-ar for lto
+      - if: osx
+        then:
+          - llvm-tools
+
+    host:
+      - bzip2
+      - sqlite
+      - liblzma-devel
+      - zlib
+      - zstd
+      - openssl
+      - readline
+      - tk
+      # These two are just to get the headers needed for tk.h, but is unused
+      - xorg-libx11
+      - xorg-xorgproto
+      - ncurses
+      - libffi
+      - if: linux
+        then:
+          - libuuid
+      - libmpdec-devel
+      - expat
+      - if: c_compiler == "gcc" and "san" in variant
+        then:
+          - libsanitizer
+
+    ignore_run_exports:
+      from_package:
+        - xorg-libx11
+        - xorg-xorgproto
+
+    run_exports:
+      noarch:
+        - python
+      weak:
+        - python_abi ${{ version }}.* *_cp${{ version | split(".") | join("") }}${{ freethreading_tag }}
 
 about:
   homepage: https://www.python.org/
diff --git a/Tools/pixi-packages/free-threading/recipe.yaml b/Tools/pixi-packages/free-threading/recipe.yaml
index 61c01562d35519..14e3b47d0b298d 100644
--- a/Tools/pixi-packages/free-threading/recipe.yaml
+++ b/Tools/pixi-packages/free-threading/recipe.yaml
@@ -1,61 +1,86 @@
 context:
   # Keep up to date
   version: "3.15"
+  variant: "free-threading"
+  freethreading_tag: ${{ "t" if "free-threading" in variant else "" }}
+  abi_tag: cp${{ version | split(".") | join("") }}${{ freethreading_tag }}
 
-package:
+recipe:
   name: python
-  version: ${{ version }}
 
 source:
   - path: ../../..
 
-build:
-  files:
-    exclude:
-      - "*.o"
-  script:
-    file: ../build.sh
-    env:
-      PYTHON_VARIANT: "free-threading"
-
-# derived from https://github.com/conda-forge/python-feedstock/blob/main/recipe/meta.yaml
-requirements:
+outputs:
+- package:
+    name: python_abi
+    version: ${{ version }}
   build:
-    - ${{ compiler('c') }}
-    - ${{ compiler('cxx') }}
-    - make
-    - pkg-config
-    # configure script looks for llvm-ar for lto
-    - if: osx
-      then:
-        - llvm-tools
-    - if: linux
-      then:
-        - ld_impl_${{ target_platform }}
-        - binutils_impl_${{ target_platform }}
-    - clang-19
-    - llvm-tools-19
-
-  host:
-    - bzip2
-    - sqlite
-    - liblzma-devel
-    - zlib
-    - zstd
-    - openssl
-    - readline
-    - tk
-    # These two are just to get the headers needed for tk.h, but is unused
-    - xorg-libx11
-    - xorg-xorgproto
-    - ncurses
-    - libffi
-    - if: linux
-      then:
-        - ld_impl_${{ target_platform }}
-        - libuuid
-    - libmpdec-devel
-    - expat
+    string: "0_cp35t"
+  requirements:
+    run_constraints:
+      - python ${{ version }}.* *_cp35t
+
+- package:
+    name: python
+    version: ${{ version }}
+  build:
+    string: "0_cp35t"
+    files:
+      exclude:
+        - "*.o"
+    script:
+      file: ../build.sh
+      env:
+        PYTHON_VARIANT: ${{ variant }}
+    python:
+      site_packages_path: "lib/python${{ version }}${{ freethreading_tag }}/site-packages"
+
+  # derived from https://github.com/conda-forge/python-feedstock/blob/main/recipe/meta.yaml
+  requirements:
+    build:
+      - ${{ compiler('c') }}
+      - ${{ compiler('cxx') }}
+      - make
+      - pkg-config
+      # configure script looks for llvm-ar for lto
+      - if: osx
+        then:
+          - llvm-tools
+
+    host:
+      - bzip2
+      - sqlite
+      - liblzma-devel
+      - zlib
+      - zstd
+      - openssl
+      - readline
+      - tk
+      # These two are just to get the headers needed for tk.h, but is unused
+      - xorg-libx11
+      - xorg-xorgproto
+      - ncurses
+      - libffi
+      - if: linux
+        then:
+          - libuuid
+      - libmpdec-devel
+      - expat
+      - if: c_compiler == "gcc" and "san" in variant
+        then:
+          - libsanitizer
+
+    ignore_run_exports:
+      from_package:
+        - xorg-libx11
+        - xorg-xorgproto
+
+    run_exports:
+      noarch:
+        - python
+      weak:
+        - python_abi ${{ version }}.* *_cp${{ version | split(".") | join("") }}${{ freethreading_tag }}
 
 about:
   homepage: https://www.python.org/
diff --git a/Tools/pixi-packages/generate.sh b/Tools/pixi-packages/generate.sh
new file mode 100644
index 00000000000000..435449812d49d5
--- /dev/null
+++ b/Tools/pixi-packages/generate.sh
@@ -0,0 +1,12 @@
+#!/bin/bash
+
+# Using a single `pixi.toml` and `recipe.yaml` for all package variants is blocked on https://github.com/prefix-dev/pixi/issues/4599
+
+for name in default asan free-threading tsan-free-threading; do
+  if [[ "${name}" == *free-threading* ]]; then
+    tag="cp35t"
+  else
+    tag="cp35"
+  fi
+  sed -e 's/variant: "default"/variant: "'${name}'"/g' -e 's/${{ abi_tag }}/'${tag}'/g' Tools/pixi-packages/recipe.yaml > Tools/pixi-packages/${name}/recipe.yaml
+done
diff --git a/Tools/pixi-packages/recipe.yaml b/Tools/pixi-packages/recipe.yaml
new file mode 100644
index 00000000000000..e6c9f9aad15ccb
--- /dev/null
+++ b/Tools/pixi-packages/recipe.yaml
@@ -0,0 +1,88 @@
+context:
+  # Keep up to date
+  version: "3.15"
+  variant: "default"
+  freethreading_tag: ${{ "t" if "free-threading" in variant else "" }}
+  abi_tag: cp${{ version | split(".") | join("") }}${{ freethreading_tag }}
+
+recipe:
+  name: python
+
+source:
+  - path: ../../..
+
+outputs:
+- package:
+    name: python_abi
+    version: ${{ version }}
+  build:
+    string: "0_${{ abi_tag }}"
+  requirements:
+    run_constraints:
+      - python ${{ version }}.* *_${{ abi_tag }}
+
+- package:
+    name: python
+    version: ${{ version }}
+  build:
+    string: "0_${{ abi_tag }}"
+    files:
+      exclude:
+        - "*.o"
+    script:
+      file: ../build.sh
+      env:
+        PYTHON_VARIANT: ${{ variant }}
+    python:
+      site_packages_path: "lib/python${{ version }}${{ freethreading_tag }}/site-packages"
+
+  # derived from https://github.com/conda-forge/python-feedstock/blob/main/recipe/meta.yaml
+  requirements:
+    build:
+      - ${{ compiler('c') }}
+      - ${{ compiler('cxx') }}
+      - make
+      - pkg-config
+      # configure script looks for llvm-ar for lto
+      - if: osx
+        then:
+          - llvm-tools
+
+    host:
+      - bzip2
+      - sqlite
+      - liblzma-devel
+      - zlib
+      - zstd
+      - openssl
+      - readline
+      - tk
+      # These two are just to get the headers needed for tk.h, but is unused
+      - xorg-libx11
+      - xorg-xorgproto
+      - ncurses
+      - libffi
+      - if: linux
+        then:
+          - libuuid
+      - libmpdec-devel
+      - expat
+      - if: c_compiler == "gcc" and "san" in variant
+        then:
+          - libsanitizer
+
+    ignore_run_exports:
+      from_package:
+        - xorg-libx11
+        - xorg-xorgproto
+
+    run_exports:
+      noarch:
+        - python
+      weak:
+        - python_abi ${{ version }}.* *_cp${{ version | split(".") | join("") }}${{ freethreading_tag }}
+
+about:
+  homepage: https://www.python.org/
+  license: Python-2.0
+  license_file: LICENSE
diff --git a/Tools/pixi-packages/tsan-free-threading/recipe.yaml b/Tools/pixi-packages/tsan-free-threading/recipe.yaml
index dfae06ad7a51d5..867aad3ee08e47 100644
--- a/Tools/pixi-packages/tsan-free-threading/recipe.yaml
+++ b/Tools/pixi-packages/tsan-free-threading/recipe.yaml
@@ -1,61 +1,86 @@
 context:
   # Keep up to date
   version: "3.15"
+  variant: "tsan-free-threading"
+  freethreading_tag: ${{ "t" if "free-threading" in variant else "" }}
+  abi_tag: cp${{ version | split(".") | join("") }}${{ freethreading_tag }}
 
-package:
+recipe:
   name: python
-  version: ${{ version }}
 
 source:
   - path: ../../..
 
-build:
-  files:
-    exclude:
-      - "*.o"
-  script:
-    file: ../build.sh
-    env:
-      PYTHON_VARIANT: "tsan-free-threading"
-
-# derived from https://github.com/conda-forge/python-feedstock/blob/main/recipe/meta.yaml
-requirements:
+outputs:
+- package:
+    name: python_abi
+    version: ${{ version }}
   build:
-    - ${{ compiler('c') }}
-    - ${{ compiler('cxx') }}
-    - make
-    - pkg-config
-    # configure script looks for llvm-ar for lto
-    - if: osx
-      then:
-        - llvm-tools
-    - if: linux
-      then:
-        - ld_impl_${{ target_platform }}
-        - binutils_impl_${{ target_platform }}
-    - clang-19
-    - llvm-tools-19
-
-  host:
-    - bzip2
-    - sqlite
-    - liblzma-devel
-    - zlib
-    - zstd
-    - openssl
-    - readline
-    - tk
-    # These two are just to get the headers needed for tk.h, but is unused
-    - xorg-libx11
-    - xorg-xorgproto
-    - ncurses
-    - libffi
-    - if: linux
-      then:
-        - ld_impl_${{ target_platform }}
-        - libuuid
-    - libmpdec-devel
-    - expat
+    string: "0_cp35t"
+  requirements:
+    run_constraints:
+      - python ${{ version }}.* *_cp35t
+
+- package:
+    name: python
+    version: ${{ version }}
+  build:
+    string: "0_cp35t"
+    files:
+      exclude:
+        - "*.o"
+    script:
+      file: ../build.sh
+      env:
+        PYTHON_VARIANT: ${{ variant }}
+    python:
+      site_packages_path: "lib/python${{ version }}${{ freethreading_tag }}/site-packages"
+
+  # derived from https://github.com/conda-forge/python-feedstock/blob/main/recipe/meta.yaml
+  requirements:
+    build:
+      - ${{ compiler('c') }}
+      - ${{ compiler('cxx') }}
+      - make
+      - pkg-config
+      # configure script looks for llvm-ar for lto
+      - if: osx
+        then:
+          - llvm-tools
+
+    host:
+      - bzip2
+      - sqlite
+      - liblzma-devel
+      - zlib
+      - zstd
+      - openssl
+      - readline
+      - tk
+      # These two are just to get the headers needed for tk.h, but is unused
+      - xorg-libx11
+      - xorg-xorgproto
+      - ncurses
+      - libffi
+      - if: linux
+        then:
+          - libuuid
+      - libmpdec-devel
+      - expat
+      - if: c_compiler == "gcc" and "san" in variant
+        then:
+          - libsanitizer
+
+    ignore_run_exports:
+      from_package:
+        - xorg-libx11
+        - xorg-xorgproto
+
+    run_exports:
+      noarch:
+        - python
+      weak:
+        - python_abi ${{ version }}.* *_cp${{ version | split(".") | join("") }}${{ freethreading_tag }}
 
 about:
   homepage: https://www.python.org/

From 456503b2531f7ca292b5d743a2f485ef6c3a2c8e Mon Sep 17 00:00:00 2001
From: Isuru Fernando <isuruf@gmail.com>
Date: Thu, 8 Jan 2026 14:27:32 -0800
Subject: [PATCH 06/15] fix typo

---
 Tools/pixi-packages/asan/recipe.yaml                | 6 +++---
 Tools/pixi-packages/default/recipe.yaml             | 6 +++---
 Tools/pixi-packages/free-threading/recipe.yaml      | 6 +++---
 Tools/pixi-packages/generate.sh                     | 4 ++--
 Tools/pixi-packages/tsan-free-threading/recipe.yaml | 6 +++---
 5 files changed, 14 insertions(+), 14 deletions(-)

diff --git a/Tools/pixi-packages/asan/recipe.yaml b/Tools/pixi-packages/asan/recipe.yaml
index e27e5235fc554d..5b7a48ac26a59a 100644
--- a/Tools/pixi-packages/asan/recipe.yaml
+++ b/Tools/pixi-packages/asan/recipe.yaml
@@ -16,16 +16,16 @@ outputs:
     name: python_abi
     version: ${{ version }}
   build:
-    string: "0_cp35"
+    string: "0_cp315"
   requirements:
     run_constraints:
-      - python ${{ version }}.* *_cp35
+      - python ${{ version }}.* *_cp315
 
 - package:
     name: python
     version: ${{ version }}
   build:
-    string: "0_cp35"
+    string: "0_cp315"
     files:
       exclude:
         - "*.o"
diff --git a/Tools/pixi-packages/default/recipe.yaml b/Tools/pixi-packages/default/recipe.yaml
index 93d6c664d6ec4e..174af1f2bd9db2 100644
--- a/Tools/pixi-packages/default/recipe.yaml
+++ b/Tools/pixi-packages/default/recipe.yaml
@@ -16,16 +16,16 @@ outputs:
     name: python_abi
     version: ${{ version }}
   build:
-    string: "0_cp35"
+    string: "0_cp315"
   requirements:
     run_constraints:
-      - python ${{ version }}.* *_cp35
+      - python ${{ version }}.* *_cp315
 
 - package:
     name: python
     version: ${{ version }}
   build:
-    string: "0_cp35"
+    string: "0_cp315"
     files:
       exclude:
         - "*.o"
diff --git a/Tools/pixi-packages/free-threading/recipe.yaml b/Tools/pixi-packages/free-threading/recipe.yaml
index 14e3b47d0b298d..f732e82a707d3b 100644
--- a/Tools/pixi-packages/free-threading/recipe.yaml
+++ b/Tools/pixi-packages/free-threading/recipe.yaml
@@ -16,16 +16,16 @@ outputs:
     name: python_abi
     version: ${{ version }}
   build:
-    string: "0_cp35t"
+    string: "0_cp315t"
   requirements:
     run_constraints:
-      - python ${{ version }}.* *_cp35t
+      - python ${{ version }}.* *_cp315t
 
 - package:
     name: python
     version: ${{ version }}
   build:
-    string: "0_cp35t"
+    string: "0_cp315t"
     files:
       exclude:
         - "*.o"
diff --git a/Tools/pixi-packages/generate.sh b/Tools/pixi-packages/generate.sh
index 435449812d49d5..896ba9fac22b9e 100644
--- a/Tools/pixi-packages/generate.sh
+++ b/Tools/pixi-packages/generate.sh
@@ -4,9 +4,9 @@
 
 for name in default asan free-threading tsan-free-threading; do
   if [[ "${name}" == *free-threading* ]]; then
-    tag="cp35t"
+    tag="cp315t"
   else
-    tag="cp35"
+    tag="cp315"
   fi
   sed -e 's/variant: "default"/variant: "'${name}'"/g' -e 's/${{ abi_tag }}/'${tag}'/g' Tools/pixi-packages/recipe.yaml > Tools/pixi-packages/${name}/recipe.yaml
 done
diff --git a/Tools/pixi-packages/tsan-free-threading/recipe.yaml b/Tools/pixi-packages/tsan-free-threading/recipe.yaml
index 867aad3ee08e47..385e07486ee06f 100644
--- a/Tools/pixi-packages/tsan-free-threading/recipe.yaml
+++ b/Tools/pixi-packages/tsan-free-threading/recipe.yaml
@@ -16,16 +16,16 @@ outputs:
     name: python_abi
     version: ${{ version }}
   build:
-    string: "0_cp35t"
+    string: "0_cp315t"
   requirements:
     run_constraints:
-      - python ${{ version }}.* *_cp35t
+      - python ${{ version }}.* *_cp315t
 
 - package:
     name: python
     version: ${{ version }}
   build:
-    string: "0_cp35t"
+    string: "0_cp315t"
     files:
       exclude:
         - "*.o"

From c46f283846b6fcb8b82d9110c9332a71d3aaaf94 Mon Sep 17 00:00:00 2001
From: Isuru Fernando <isuruf@gmail.com>
Date: Thu, 8 Jan 2026 18:07:08 -0800
Subject: [PATCH 07/15] Use single recipe.yaml duplicated across directories

---
 Tools/pixi-packages/README.md                 |  8 +-
 Tools/pixi-packages/asan/pixi.toml            |  5 ++
 Tools/pixi-packages/asan/recipe.yaml          | 14 +--
 Tools/pixi-packages/build.sh                  |  4 +-
 Tools/pixi-packages/default/pixi.toml         |  5 ++
 Tools/pixi-packages/default/recipe.yaml       | 16 ++--
 .../pixi.toml                                 |  5 ++
 .../recipe.yaml                               | 14 +--
 Tools/pixi-packages/generate.sh               |  9 +-
 Tools/pixi-packages/recipe.yaml               | 88 -------------------
 .../pixi.toml                                 |  5 ++
 .../recipe.yaml                               | 14 +--
 12 files changed, 57 insertions(+), 130 deletions(-)
 rename Tools/pixi-packages/{free-threading => freethreading}/pixi.toml (66%)
 rename Tools/pixi-packages/{free-threading => freethreading}/recipe.yaml (80%)
 delete mode 100644 Tools/pixi-packages/recipe.yaml
 rename Tools/pixi-packages/{tsan-free-threading => tsan_freethreading}/pixi.toml (65%)
 rename Tools/pixi-packages/{tsan-free-threading => tsan_freethreading}/recipe.yaml (80%)

diff --git a/Tools/pixi-packages/README.md b/Tools/pixi-packages/README.md
index 94d606cee3439d..99e92f3cb3d90a 100644
--- a/Tools/pixi-packages/README.md
+++ b/Tools/pixi-packages/README.md
@@ -20,14 +20,14 @@ Each package definition is contained in a subdirectory, but they share the build
 `build.sh` in this directory. Currently defined package variants:
 
 - `default`
-- `free-threading`
+- `freethreading`
 - `asan`: ASan-instrumented build
-- `tsan-free-threading`: TSan-instrumented free-threading build
+- `tsan_freethreading`: TSan-instrumented free-threading build
 
 ## Maintenance
 
-- Keep the `version` fields in each `recipe.yaml` up to date with the Python version
-- Keep the dependency requirements up to date in each `recipe.yaml`
+- Keep the `abi_tag` and `version` fields in each `pixi.toml` up to date with the Python version
+- If you update one `recipe.yaml` file, update all
 - Update `build.sh` for any breaking changes in the `configure` and `make` workflow
 
 ## Opportunities for future improvement
diff --git a/Tools/pixi-packages/asan/pixi.toml b/Tools/pixi-packages/asan/pixi.toml
index 001ff78fa5d8cb..7c8200067d8cdf 100644
--- a/Tools/pixi-packages/asan/pixi.toml
+++ b/Tools/pixi-packages/asan/pixi.toml
@@ -3,6 +3,11 @@ channels = ["https://prefix.dev/conda-forge"]
 platforms = ["osx-arm64", "linux-64"]
 preview = ["pixi-build"]
 
+[workspace.build-variants]
+variant = ["asan"]
+abi_tag = ["cp315"]
+version = ["3.15"]
+
 [package.build.backend]
 name = "pixi-build-rattler-build"
 version = "*"
diff --git a/Tools/pixi-packages/asan/recipe.yaml b/Tools/pixi-packages/asan/recipe.yaml
index 5b7a48ac26a59a..a59e7db9e6353f 100644
--- a/Tools/pixi-packages/asan/recipe.yaml
+++ b/Tools/pixi-packages/asan/recipe.yaml
@@ -1,9 +1,9 @@
 context:
   # Keep up to date
   version: "3.15"
-  variant: "asan"
-  freethreading_tag: ${{ "t" if "free-threading" in variant else "" }}
-  abi_tag: cp${{ version | split(".") | join("") }}${{ freethreading_tag }}
+  variant: ${{ variant }}
+  freethreading_tag: ${{ "t" if "freethreading" in variant else "" }}
+  abi_tag: ${{ abi_tag }}
 
 recipe:
   name: python
@@ -16,16 +16,16 @@ outputs:
     name: python_abi
     version: ${{ version }}
   build:
-    string: "0_cp315"
+    string: "0_${{ variant }}_${{ abi_tag }}"
   requirements:
     run_constraints:
-      - python ${{ version }}.* *_cp315
+      - python ${{ version }}.* *_${{ variant }}_${{ abi_tag }}
 
 - package:
     name: python
     version: ${{ version }}
   build:
-    string: "0_cp315"
+    string: "0_${{ variant }}_${{ abi_tag }}"
     files:
       exclude:
         - "*.o"
@@ -80,7 +80,7 @@ outputs:
       noarch:
         - python
       weak:
-        - python_abi ${{ version }}.* *_cp${{ version | split(".") | join("") }}${{ freethreading_tag }}
+        - python_abi ${{ version }}.* *_${{ variant }}_${{ abi_tag }}
 
 about:
   homepage: https://www.python.org/
diff --git a/Tools/pixi-packages/build.sh b/Tools/pixi-packages/build.sh
index 6332ef15564a6a..1a4f5d6a26b415 100644
--- a/Tools/pixi-packages/build.sh
+++ b/Tools/pixi-packages/build.sh
@@ -1,6 +1,6 @@
 #!/bin/bash
 
-if [[ "${PYTHON_VARIANT}" == "free-threading" ]]; then
+if [[ "${PYTHON_VARIANT}" == "freethreading" ]]; then
     echo "BUILD TYPE: FREE-THREADING"
     BUILD_DIR="../build_free_threading"
     CONFIGURE_EXTRA="--disable-gil"
@@ -9,7 +9,7 @@ elif [[ "${PYTHON_VARIANT}" == "asan" ]]; then
     BUILD_DIR="../build_asan"
     CONFIGURE_EXTRA="--with-address-sanitizer"
     export ASAN_OPTIONS="strict_init_order=true"
-elif [[ "${PYTHON_VARIANT}" == "tsan-free-threading" ]]; then
+elif [[ "${PYTHON_VARIANT}" == "tsan_freethreading" ]]; then
     echo "BUILD TYPE: TSAN FREE-THREADING"
     BUILD_DIR="../build_tsan_free_threading"
     CONFIGURE_EXTRA="--disable-gil --with-thread-sanitizer"
diff --git a/Tools/pixi-packages/default/pixi.toml b/Tools/pixi-packages/default/pixi.toml
index 001ff78fa5d8cb..efc0892b45520f 100644
--- a/Tools/pixi-packages/default/pixi.toml
+++ b/Tools/pixi-packages/default/pixi.toml
@@ -3,6 +3,11 @@ channels = ["https://prefix.dev/conda-forge"]
 platforms = ["osx-arm64", "linux-64"]
 preview = ["pixi-build"]
 
+[workspace.build-variants]
+variant = ["default"]
+abi_tag = ["cp315"]
+version = ["3.15"]
+
 [package.build.backend]
 name = "pixi-build-rattler-build"
 version = "*"
diff --git a/Tools/pixi-packages/default/recipe.yaml b/Tools/pixi-packages/default/recipe.yaml
index 174af1f2bd9db2..83f04736d7ed70 100644
--- a/Tools/pixi-packages/default/recipe.yaml
+++ b/Tools/pixi-packages/default/recipe.yaml
@@ -1,9 +1,9 @@
 context:
   # Keep up to date
-  version: "3.15"
-  variant: "default"
-  freethreading_tag: ${{ "t" if "free-threading" in variant else "" }}
-  abi_tag: cp${{ version | split(".") | join("") }}${{ freethreading_tag }}
+  version: ${{ version }}
+  variant: ${{ variant }}
+  freethreading_tag: ${{ "t" if "freethreading" in variant else "" }}
+  abi_tag: ${{ abi_tag }}
 
 recipe:
   name: python
@@ -16,16 +16,16 @@ outputs:
     name: python_abi
     version: ${{ version }}
   build:
-    string: "0_cp315"
+    string: "0_${{ variant }}_${{ abi_tag }}"
   requirements:
     run_constraints:
-      - python ${{ version }}.* *_cp315
+      - python ${{ version }}.* *_${{ variant }}_${{ abi_tag }}
 
 - package:
     name: python
     version: ${{ version }}
   build:
-    string: "0_cp315"
+    string: "0_${{ variant }}_${{ abi_tag }}"
     files:
       exclude:
         - "*.o"
@@ -80,7 +80,7 @@ outputs:
       noarch:
         - python
       weak:
-        - python_abi ${{ version }}.* *_cp${{ version | split(".") | join("") }}${{ freethreading_tag }}
+        - python_abi ${{ version }}.* *_${{ variant }}_${{ abi_tag }}
 
 about:
   homepage: https://www.python.org/
diff --git a/Tools/pixi-packages/free-threading/pixi.toml b/Tools/pixi-packages/freethreading/pixi.toml
similarity index 66%
rename from Tools/pixi-packages/free-threading/pixi.toml
rename to Tools/pixi-packages/freethreading/pixi.toml
index 001ff78fa5d8cb..a6369b02059572 100644
--- a/Tools/pixi-packages/free-threading/pixi.toml
+++ b/Tools/pixi-packages/freethreading/pixi.toml
@@ -3,6 +3,11 @@ channels = ["https://prefix.dev/conda-forge"]
 platforms = ["osx-arm64", "linux-64"]
 preview = ["pixi-build"]
 
+[workspace.build-variants]
+variant = ["freethreading"]
+abi_tag = ["cp315t"]
+version = ["3.15"]
+
 [package.build.backend]
 name = "pixi-build-rattler-build"
 version = "*"
diff --git a/Tools/pixi-packages/free-threading/recipe.yaml b/Tools/pixi-packages/freethreading/recipe.yaml
similarity index 80%
rename from Tools/pixi-packages/free-threading/recipe.yaml
rename to Tools/pixi-packages/freethreading/recipe.yaml
index f732e82a707d3b..a59e7db9e6353f 100644
--- a/Tools/pixi-packages/free-threading/recipe.yaml
+++ b/Tools/pixi-packages/freethreading/recipe.yaml
@@ -1,9 +1,9 @@
 context:
   # Keep up to date
   version: "3.15"
-  variant: "free-threading"
-  freethreading_tag: ${{ "t" if "free-threading" in variant else "" }}
-  abi_tag: cp${{ version | split(".") | join("") }}${{ freethreading_tag }}
+  variant: ${{ variant }}
+  freethreading_tag: ${{ "t" if "freethreading" in variant else "" }}
+  abi_tag: ${{ abi_tag }}
 
 recipe:
   name: python
@@ -16,16 +16,16 @@ outputs:
     name: python_abi
     version: ${{ version }}
   build:
-    string: "0_cp315t"
+    string: "0_${{ variant }}_${{ abi_tag }}"
   requirements:
     run_constraints:
-      - python ${{ version }}.* *_cp315t
+      - python ${{ version }}.* *_${{ variant }}_${{ abi_tag }}
 
 - package:
     name: python
     version: ${{ version }}
   build:
-    string: "0_cp315t"
+    string: "0_${{ variant }}_${{ abi_tag }}"
     files:
       exclude:
         - "*.o"
@@ -80,7 +80,7 @@ outputs:
       noarch:
         - python
       weak:
-        - python_abi ${{ version }}.* *_cp${{ version | split(".") | join("") }}${{ freethreading_tag }}
+        - python_abi ${{ version }}.* *_${{ variant }}_${{ abi_tag }}
 
 about:
   homepage: https://www.python.org/
diff --git a/Tools/pixi-packages/generate.sh b/Tools/pixi-packages/generate.sh
index 896ba9fac22b9e..d6cb48448aa8bb 100644
--- a/Tools/pixi-packages/generate.sh
+++ b/Tools/pixi-packages/generate.sh
@@ -2,11 +2,6 @@
 
 # Using a single `pixi.toml` and `recipe.yaml` for all package variants is blocked on https://github.com/prefix-dev/pixi/issues/4599
 
-for name in default asan free-threading tsan-free-threading; do
-  if [[ "${name}" == *free-threading* ]]; then
-    tag="cp315t"
-  else
-    tag="cp315"
-  fi
-  sed -e 's/variant: "default"/variant: "'${name}'"/g' -e 's/${{ abi_tag }}/'${tag}'/g' Tools/pixi-packages/recipe.yaml > Tools/pixi-packages/${name}/recipe.yaml
+for name in asan free-threading tsan-free-threading; do
+  cp Tools/pixi-packages/default/recipe.yaml Tools/pixi-packages/${name}/recipe.yaml
 done
diff --git a/Tools/pixi-packages/recipe.yaml b/Tools/pixi-packages/recipe.yaml
deleted file mode 100644
index e6c9f9aad15ccb..00000000000000
--- a/Tools/pixi-packages/recipe.yaml
+++ /dev/null
@@ -1,88 +0,0 @@
-context:
-  # Keep up to date
-  version: "3.15"
-  variant: "default"
-  freethreading_tag: ${{ "t" if "free-threading" in variant else "" }}
-  abi_tag: cp${{ version | split(".") | join("") }}${{ freethreading_tag }}
-
-recipe:
-  name: python
-
-source:
-  - path: ../../..
-
-outputs:
-- package:
-    name: python_abi
-    version: ${{ version }}
-  build:
-    string: "0_${{ abi_tag }}"
-  requirements:
-    run_constraints:
-      - python ${{ version }}.* *_${{ abi_tag }}
-
-- package:
-    name: python
-    version: ${{ version }}
-  build:
-    string: "0_${{ abi_tag }}"
-    files:
-      exclude:
-        - "*.o"
-    script:
-      file: ../build.sh
-      env:
-        PYTHON_VARIANT: ${{ variant }}
-    python:
-      site_packages_path: "lib/python${{ version }}${{ freethreading_tag }}/site-packages"
-
-  # derived from https://github.com/conda-forge/python-feedstock/blob/main/recipe/meta.yaml
-  requirements:
-    build:
-      - ${{ compiler('c') }}
-      - ${{ compiler('cxx') }}
-      - make
-      - pkg-config
-      # configure script looks for llvm-ar for lto
-      - if: osx
-        then:
-          - llvm-tools
-
-    host:
-      - bzip2
-      - sqlite
-      - liblzma-devel
-      - zlib
-      - zstd
-      - openssl
-      - readline
-      - tk
-      # These two are just to get the headers needed for tk.h, but is unused
-      - xorg-libx11
-      - xorg-xorgproto
-      - ncurses
-      - libffi
-      - if: linux
-        then:
-          - libuuid
-      - libmpdec-devel
-      - expat
-      - if: c_compiler == "gcc" and "san" in variant
-        then:
-          - libsanitizer
-
-    ignore_run_exports:
-      from_package:
-        - xorg-libx11
-        - xorg-xorgproto
-
-    run_exports:
-      noarch:
-        - python
-      weak:
-        - python_abi ${{ version }}.* *_cp${{ version | split(".") | join("") }}${{ freethreading_tag }}
-
-about:
-  homepage: https://www.python.org/
-  license: Python-2.0
-  license_file: LICENSE
diff --git a/Tools/pixi-packages/tsan-free-threading/pixi.toml b/Tools/pixi-packages/tsan_freethreading/pixi.toml
similarity index 65%
rename from Tools/pixi-packages/tsan-free-threading/pixi.toml
rename to Tools/pixi-packages/tsan_freethreading/pixi.toml
index 001ff78fa5d8cb..be0515ee0bf065 100644
--- a/Tools/pixi-packages/tsan-free-threading/pixi.toml
+++ b/Tools/pixi-packages/tsan_freethreading/pixi.toml
@@ -3,6 +3,11 @@ channels = ["https://prefix.dev/conda-forge"]
 platforms = ["osx-arm64", "linux-64"]
 preview = ["pixi-build"]
 
+[workspace.build-variants]
+variant = ["tsan_freethreading"]
+abi_tag = ["cp315t"]
+version = ["3.15"]
+
 [package.build.backend]
 name = "pixi-build-rattler-build"
 version = "*"
diff --git a/Tools/pixi-packages/tsan-free-threading/recipe.yaml b/Tools/pixi-packages/tsan_freethreading/recipe.yaml
similarity index 80%
rename from Tools/pixi-packages/tsan-free-threading/recipe.yaml
rename to Tools/pixi-packages/tsan_freethreading/recipe.yaml
index 385e07486ee06f..a59e7db9e6353f 100644
--- a/Tools/pixi-packages/tsan-free-threading/recipe.yaml
+++ b/Tools/pixi-packages/tsan_freethreading/recipe.yaml
@@ -1,9 +1,9 @@
 context:
   # Keep up to date
   version: "3.15"
-  variant: "tsan-free-threading"
-  freethreading_tag: ${{ "t" if "free-threading" in variant else "" }}
-  abi_tag: cp${{ version | split(".") | join("") }}${{ freethreading_tag }}
+  variant: ${{ variant }}
+  freethreading_tag: ${{ "t" if "freethreading" in variant else "" }}
+  abi_tag: ${{ abi_tag }}
 
 recipe:
   name: python
@@ -16,16 +16,16 @@ outputs:
     name: python_abi
     version: ${{ version }}
   build:
-    string: "0_cp315t"
+    string: "0_${{ variant }}_${{ abi_tag }}"
   requirements:
     run_constraints:
-      - python ${{ version }}.* *_cp315t
+      - python ${{ version }}.* *_${{ variant }}_${{ abi_tag }}
 
 - package:
     name: python
     version: ${{ version }}
   build:
-    string: "0_cp315t"
+    string: "0_${{ variant }}_${{ abi_tag }}"
     files:
       exclude:
         - "*.o"
@@ -80,7 +80,7 @@ outputs:
       noarch:
         - python
       weak:
-        - python_abi ${{ version }}.* *_cp${{ version | split(".") | join("") }}${{ freethreading_tag }}
+        - python_abi ${{ version }}.* *_${{ variant }}_${{ abi_tag }}
 
 about:
   homepage: https://www.python.org/

From d1a38c118a40453f18c3010c4a149e47ce6e281e Mon Sep 17 00:00:00 2001
From: Isuru Fernando <isuruf@gmail.com>
Date: Thu, 8 Jan 2026 18:09:45 -0800
Subject: [PATCH 08/15] use symlinks

---
 Tools/pixi-packages/asan/recipe.yaml          | 89 +------------------
 Tools/pixi-packages/freethreading/recipe.yaml | 89 +------------------
 .../tsan_freethreading/recipe.yaml            | 89 +------------------
 3 files changed, 3 insertions(+), 264 deletions(-)
 mode change 100644 => 120000 Tools/pixi-packages/asan/recipe.yaml
 mode change 100644 => 120000 Tools/pixi-packages/freethreading/recipe.yaml
 mode change 100644 => 120000 Tools/pixi-packages/tsan_freethreading/recipe.yaml

diff --git a/Tools/pixi-packages/asan/recipe.yaml b/Tools/pixi-packages/asan/recipe.yaml
deleted file mode 100644
index a59e7db9e6353f..00000000000000
--- a/Tools/pixi-packages/asan/recipe.yaml
+++ /dev/null
@@ -1,88 +0,0 @@
-context:
-  # Keep up to date
-  version: "3.15"
-  variant: ${{ variant }}
-  freethreading_tag: ${{ "t" if "freethreading" in variant else "" }}
-  abi_tag: ${{ abi_tag }}
-
-recipe:
-  name: python
-
-source:
-  - path: ../../..
-
-outputs:
-- package:
-    name: python_abi
-    version: ${{ version }}
-  build:
-    string: "0_${{ variant }}_${{ abi_tag }}"
-  requirements:
-    run_constraints:
-      - python ${{ version }}.* *_${{ variant }}_${{ abi_tag }}
-
-- package:
-    name: python
-    version: ${{ version }}
-  build:
-    string: "0_${{ variant }}_${{ abi_tag }}"
-    files:
-      exclude:
-        - "*.o"
-    script:
-      file: ../build.sh
-      env:
-        PYTHON_VARIANT: ${{ variant }}
-    python:
-      site_packages_path: "lib/python${{ version }}${{ freethreading_tag }}/site-packages"
-
-  # derived from https://github.com/conda-forge/python-feedstock/blob/main/recipe/meta.yaml
-  requirements:
-    build:
-      - ${{ compiler('c') }}
-      - ${{ compiler('cxx') }}
-      - make
-      - pkg-config
-      # configure script looks for llvm-ar for lto
-      - if: osx
-        then:
-          - llvm-tools
-
-    host:
-      - bzip2
-      - sqlite
-      - liblzma-devel
-      - zlib
-      - zstd
-      - openssl
-      - readline
-      - tk
-      # These two are just to get the headers needed for tk.h, but is unused
-      - xorg-libx11
-      - xorg-xorgproto
-      - ncurses
-      - libffi
-      - if: linux
-        then:
-          - libuuid
-      - libmpdec-devel
-      - expat
-      - if: c_compiler == "gcc" and "san" in variant
-        then:
-          - libsanitizer
-
-    ignore_run_exports:
-      from_package:
-        - xorg-libx11
-        - xorg-xorgproto
-
-    run_exports:
-      noarch:
-        - python
-      weak:
-        - python_abi ${{ version }}.* *_${{ variant }}_${{ abi_tag }}
-
-about:
-  homepage: https://www.python.org/
-  license: Python-2.0
-  license_file: LICENSE
diff --git a/Tools/pixi-packages/asan/recipe.yaml b/Tools/pixi-packages/asan/recipe.yaml
new file mode 120000
index 00000000000000..90c5c497965560
--- /dev/null
+++ b/Tools/pixi-packages/asan/recipe.yaml
@@ -0,0 +1 @@
+../default/recipe.yaml
\ No newline at end of file
diff --git a/Tools/pixi-packages/freethreading/recipe.yaml b/Tools/pixi-packages/freethreading/recipe.yaml
deleted file mode 100644
index a59e7db9e6353f..00000000000000
--- a/Tools/pixi-packages/freethreading/recipe.yaml
+++ /dev/null
@@ -1,88 +0,0 @@
-context:
-  # Keep up to date
-  version: "3.15"
-  variant: ${{ variant }}
-  freethreading_tag: ${{ "t" if "freethreading" in variant else "" }}
-  abi_tag: ${{ abi_tag }}
-
-recipe:
-  name: python
-
-source:
-  - path: ../../..
-
-outputs:
-- package:
-    name: python_abi
-    version: ${{ version }}
-  build:
-    string: "0_${{ variant }}_${{ abi_tag }}"
-  requirements:
-    run_constraints:
-      - python ${{ version }}.* *_${{ variant }}_${{ abi_tag }}
-
-- package:
-    name: python
-    version: ${{ version }}
-  build:
-    string: "0_${{ variant }}_${{ abi_tag }}"
-    files:
-      exclude:
-        - "*.o"
-    script:
-      file: ../build.sh
-      env:
-        PYTHON_VARIANT: ${{ variant }}
-    python:
-      site_packages_path: "lib/python${{ version }}${{ freethreading_tag }}/site-packages"
-
-  # derived from https://github.com/conda-forge/python-feedstock/blob/main/recipe/meta.yaml
-  requirements:
-    build:
-      - ${{ compiler('c') }}
-      - ${{ compiler('cxx') }}
-      - make
-      - pkg-config
-      # configure script looks for llvm-ar for lto
-      - if: osx
-        then:
-          - llvm-tools
-
-    host:
-      - bzip2
-      - sqlite
-      - liblzma-devel
-      - zlib
-      - zstd
-      - openssl
-      - readline
-      - tk
-      # These two are just to get the headers needed for tk.h, but is unused
-      - xorg-libx11
-      - xorg-xorgproto
-      - ncurses
-      - libffi
-      - if: linux
-        then:
-          - libuuid
-      - libmpdec-devel
-      - expat
-      - if: c_compiler == "gcc" and "san" in variant
-        then:
-          - libsanitizer
-
-    ignore_run_exports:
-      from_package:
-        - xorg-libx11
-        - xorg-xorgproto
-
-    run_exports:
-      noarch:
-        - python
-      weak:
-        - python_abi ${{ version }}.* *_${{ variant }}_${{ abi_tag }}
-
-about:
-  homepage: https://www.python.org/
-  license: Python-2.0
-  license_file: LICENSE
diff --git a/Tools/pixi-packages/freethreading/recipe.yaml b/Tools/pixi-packages/freethreading/recipe.yaml
new file mode 120000
index 00000000000000..90c5c497965560
--- /dev/null
+++ b/Tools/pixi-packages/freethreading/recipe.yaml
@@ -0,0 +1 @@
+../default/recipe.yaml
\ No newline at end of file
diff --git a/Tools/pixi-packages/tsan_freethreading/recipe.yaml b/Tools/pixi-packages/tsan_freethreading/recipe.yaml
deleted file mode 100644
index a59e7db9e6353f..00000000000000
--- a/Tools/pixi-packages/tsan_freethreading/recipe.yaml
+++ /dev/null
@@ -1,88 +0,0 @@
-context:
-  # Keep up to date
-  version: "3.15"
-  variant: ${{ variant }}
-  freethreading_tag: ${{ "t" if "freethreading" in variant else "" }}
-  abi_tag: ${{ abi_tag }}
-
-recipe:
-  name: python
-
-source:
-  - path: ../../..
-
-outputs:
-- package:
-    name: python_abi
-    version: ${{ version }}
-  build:
-    string: "0_${{ variant }}_${{ abi_tag }}"
-  requirements:
-    run_constraints:
-      - python ${{ version }}.* *_${{ variant }}_${{ abi_tag }}
-
-- package:
-    name: python
-    version: ${{ version }}
-  build:
-    string: "0_${{ variant }}_${{ abi_tag }}"
-    files:
-      exclude:
-        - "*.o"
-    script:
-      file: ../build.sh
-      env:
-        PYTHON_VARIANT: ${{ variant }}
-    python:
-      site_packages_path: "lib/python${{ version }}${{ freethreading_tag }}/site-packages"
-
-  # derived from https://github.com/conda-forge/python-feedstock/blob/main/recipe/meta.yaml
-  requirements:
-    build:
-      - ${{ compiler('c') }}
-      - ${{ compiler('cxx') }}
-      - make
-      - pkg-config
-      # configure script looks for llvm-ar for lto
-      - if: osx
-        then:
-          - llvm-tools
-
-    host:
-      - bzip2
-      - sqlite
-      - liblzma-devel
-      - zlib
-      - zstd
-      - openssl
-      - readline
-      - tk
-      # These two are just to get the headers needed for tk.h, but is unused
-      - xorg-libx11
-      - xorg-xorgproto
-      - ncurses
-      - libffi
-      - if: linux
-        then:
-          - libuuid
-      - libmpdec-devel
-      - expat
-      - if: c_compiler == "gcc" and "san" in variant
-        then:
-          - libsanitizer
-
-    ignore_run_exports:
-      from_package:
-        - xorg-libx11
-        - xorg-xorgproto
-
-    run_exports:
-      noarch:
-        - python
-      weak:
-        - python_abi ${{ version }}.* *_${{ variant }}_${{ abi_tag }}
-
-about:
-  homepage: https://www.python.org/
-  license: Python-2.0
-  license_file: LICENSE
diff --git a/Tools/pixi-packages/tsan_freethreading/recipe.yaml b/Tools/pixi-packages/tsan_freethreading/recipe.yaml
new file mode 120000
index 00000000000000..90c5c497965560
--- /dev/null
+++ b/Tools/pixi-packages/tsan_freethreading/recipe.yaml
@@ -0,0 +1 @@
+../default/recipe.yaml
\ No newline at end of file

From 57715f54119631a6e6c7717f0ead364b20439a6d Mon Sep 17 00:00:00 2001
From: Isuru Fernando <isuruf@gmail.com>
Date: Thu, 8 Jan 2026 18:10:59 -0800
Subject: [PATCH 09/15] remove generate.sh

---
 Tools/pixi-packages/README.md   | 1 -
 Tools/pixi-packages/generate.sh | 7 -------
 2 files changed, 8 deletions(-)
 delete mode 100644 Tools/pixi-packages/generate.sh

diff --git a/Tools/pixi-packages/README.md b/Tools/pixi-packages/README.md
index 99e92f3cb3d90a..4cd48da0715cf9 100644
--- a/Tools/pixi-packages/README.md
+++ b/Tools/pixi-packages/README.md
@@ -27,7 +27,6 @@ Each package definition is contained in a subdirectory, but they share the build
 ## Maintenance
 
 - Keep the `abi_tag` and `version` fields in each `pixi.toml` up to date with the Python version
-- If you update one `recipe.yaml` file, update all
 - Update `build.sh` for any breaking changes in the `configure` and `make` workflow
 
 ## Opportunities for future improvement
diff --git a/Tools/pixi-packages/generate.sh b/Tools/pixi-packages/generate.sh
deleted file mode 100644
index d6cb48448aa8bb..00000000000000
--- a/Tools/pixi-packages/generate.sh
+++ /dev/null
@@ -1,7 +0,0 @@
-#!/bin/bash
-
-# Using a single `pixi.toml` and `recipe.yaml` for all package variants is blocked on https://github.com/prefix-dev/pixi/issues/4599
-
-for name in asan free-threading tsan-free-threading; do
-  cp Tools/pixi-packages/default/recipe.yaml Tools/pixi-packages/${name}/recipe.yaml
-done

From 12da3b81796c73f4b4b4c55fc34d6138cf20b7a5 Mon Sep 17 00:00:00 2001
From: crusaderky <crusaderky@gmail.com>
Date: Wed, 14 Jan 2026 14:58:36 +0000
Subject: [PATCH 10/15] Fix

---
 Tools/pixi-packages/asan/variants.yaml              |  6 ++++++
 Tools/pixi-packages/build.sh                        |  6 +++---
 Tools/pixi-packages/default/pixi.toml               |  5 -----
 Tools/pixi-packages/default/recipe.yaml             |  3 ---
 Tools/pixi-packages/default/variants.yaml           |  6 ++++++
 Tools/pixi-packages/freethreading/variants.yaml     |  6 ++++++
 Tools/pixi-packages/tsan-freethreading/pixi.toml    |  1 +
 .../recipe.yaml                                     |  0
 .../pixi-packages/tsan-freethreading/variants.yaml  |  6 ++++++
 Tools/pixi-packages/tsan_freethreading/pixi.toml    | 13 -------------
 10 files changed, 28 insertions(+), 24 deletions(-)
 create mode 100644 Tools/pixi-packages/asan/variants.yaml
 create mode 100644 Tools/pixi-packages/default/variants.yaml
 create mode 100644 Tools/pixi-packages/freethreading/variants.yaml
 create mode 120000 Tools/pixi-packages/tsan-freethreading/pixi.toml
 rename Tools/pixi-packages/{tsan_freethreading => tsan-freethreading}/recipe.yaml (100%)
 create mode 100644 Tools/pixi-packages/tsan-freethreading/variants.yaml
 delete mode 100644 Tools/pixi-packages/tsan_freethreading/pixi.toml

diff --git a/Tools/pixi-packages/asan/variants.yaml b/Tools/pixi-packages/asan/variants.yaml
new file mode 100644
index 00000000000000..fdb26662a261bb
--- /dev/null
+++ b/Tools/pixi-packages/asan/variants.yaml
@@ -0,0 +1,6 @@
+variant:
+  - asan
+abi_tag:
+  - cp315
+version:
+  - 3.15
diff --git a/Tools/pixi-packages/build.sh b/Tools/pixi-packages/build.sh
index 1a4f5d6a26b415..e6d96f7b0cb3d8 100644
--- a/Tools/pixi-packages/build.sh
+++ b/Tools/pixi-packages/build.sh
@@ -2,16 +2,16 @@
 
 if [[ "${PYTHON_VARIANT}" == "freethreading" ]]; then
     echo "BUILD TYPE: FREE-THREADING"
-    BUILD_DIR="../build_free_threading"
+    BUILD_DIR="../build_freethreading"
     CONFIGURE_EXTRA="--disable-gil"
 elif [[ "${PYTHON_VARIANT}" == "asan" ]]; then
     echo "BUILD TYPE: ASAN"
     BUILD_DIR="../build_asan"
     CONFIGURE_EXTRA="--with-address-sanitizer"
     export ASAN_OPTIONS="strict_init_order=true"
-elif [[ "${PYTHON_VARIANT}" == "tsan_freethreading" ]]; then
+elif [[ "${PYTHON_VARIANT}" == "tsan-freethreading" ]]; then
     echo "BUILD TYPE: TSAN FREE-THREADING"
-    BUILD_DIR="../build_tsan_free_threading"
+    BUILD_DIR="../build_tsan-freethreading"
     CONFIGURE_EXTRA="--disable-gil --with-thread-sanitizer"
     export TSAN_OPTIONS="suppressions=${SRC_DIR}/Tools/tsan/suppressions_free_threading.txt"
 else
diff --git a/Tools/pixi-packages/default/pixi.toml b/Tools/pixi-packages/default/pixi.toml
index efc0892b45520f..001ff78fa5d8cb 100644
--- a/Tools/pixi-packages/default/pixi.toml
+++ b/Tools/pixi-packages/default/pixi.toml
@@ -3,11 +3,6 @@ channels = ["https://prefix.dev/conda-forge"]
 platforms = ["osx-arm64", "linux-64"]
 preview = ["pixi-build"]
 
-[workspace.build-variants]
-variant = ["default"]
-abi_tag = ["cp315"]
-version = ["3.15"]
-
 [package.build.backend]
 name = "pixi-build-rattler-build"
 version = "*"
diff --git a/Tools/pixi-packages/default/recipe.yaml b/Tools/pixi-packages/default/recipe.yaml
index 83f04736d7ed70..7120c5f2a369a2 100644
--- a/Tools/pixi-packages/default/recipe.yaml
+++ b/Tools/pixi-packages/default/recipe.yaml
@@ -1,9 +1,6 @@
 context:
   # Keep up to date
-  version: ${{ version }}
-  variant: ${{ variant }}
   freethreading_tag: ${{ "t" if "freethreading" in variant else "" }}
-  abi_tag: ${{ abi_tag }}
 
 recipe:
   name: python
diff --git a/Tools/pixi-packages/default/variants.yaml b/Tools/pixi-packages/default/variants.yaml
new file mode 100644
index 00000000000000..f66e9e7a2226ba
--- /dev/null
+++ b/Tools/pixi-packages/default/variants.yaml
@@ -0,0 +1,6 @@
+variant:
+  - default
+abi_tag:
+  - cp315
+version:
+  - 3.15
diff --git a/Tools/pixi-packages/freethreading/variants.yaml b/Tools/pixi-packages/freethreading/variants.yaml
new file mode 100644
index 00000000000000..022833d04c3821
--- /dev/null
+++ b/Tools/pixi-packages/freethreading/variants.yaml
@@ -0,0 +1,6 @@
+variant:
+  - freethreading
+abi_tag:
+  - cp315t
+version:
+  - 3.15
diff --git a/Tools/pixi-packages/tsan-freethreading/pixi.toml b/Tools/pixi-packages/tsan-freethreading/pixi.toml
new file mode 120000
index 00000000000000..3d713eb33ae811
--- /dev/null
+++ b/Tools/pixi-packages/tsan-freethreading/pixi.toml
@@ -0,0 +1 @@
+../default/pixi.toml
\ No newline at end of file
diff --git a/Tools/pixi-packages/tsan_freethreading/recipe.yaml b/Tools/pixi-packages/tsan-freethreading/recipe.yaml
similarity index 100%
rename from Tools/pixi-packages/tsan_freethreading/recipe.yaml
rename to Tools/pixi-packages/tsan-freethreading/recipe.yaml
diff --git a/Tools/pixi-packages/tsan-freethreading/variants.yaml b/Tools/pixi-packages/tsan-freethreading/variants.yaml
new file mode 100644
index 00000000000000..74e02f2e580320
--- /dev/null
+++ b/Tools/pixi-packages/tsan-freethreading/variants.yaml
@@ -0,0 +1,6 @@
+variant:
+  - tsan-freethreading
+abi_tag:
+  - cp315t
+version:
+  - 3.15
diff --git a/Tools/pixi-packages/tsan_freethreading/pixi.toml b/Tools/pixi-packages/tsan_freethreading/pixi.toml
deleted file mode 100644
index be0515ee0bf065..00000000000000
--- a/Tools/pixi-packages/tsan_freethreading/pixi.toml
+++ /dev/null
@@ -1,13 +0,0 @@
-[workspace]
-channels = ["https://prefix.dev/conda-forge"]
-platforms = ["osx-arm64", "linux-64"]
-preview = ["pixi-build"]
-
-[workspace.build-variants]
-variant = ["tsan_freethreading"]
-abi_tag = ["cp315t"]
-version = ["3.15"]
-
-[package.build.backend]
-name = "pixi-build-rattler-build"
-version = "*"

From 1a4106f5d5024a17aecf1c8efc40d54a46aff113 Mon Sep 17 00:00:00 2001
From: crusaderky <crusaderky@gmail.com>
Date: Wed, 14 Jan 2026 15:15:31 +0000
Subject: [PATCH 11/15] Fix tsan

---
 Tools/pixi-packages/asan/variants.yaml           |  2 +-
 Tools/pixi-packages/build.sh                     | 16 +++++++---------
 Tools/pixi-packages/default/recipe.yaml          |  8 ++++----
 .../tsan-freethreading/variants.yaml             |  2 +-
 4 files changed, 13 insertions(+), 15 deletions(-)

diff --git a/Tools/pixi-packages/asan/variants.yaml b/Tools/pixi-packages/asan/variants.yaml
index fdb26662a261bb..a4eb28b70c5b69 100644
--- a/Tools/pixi-packages/asan/variants.yaml
+++ b/Tools/pixi-packages/asan/variants.yaml
@@ -1,6 +1,6 @@
 variant:
   - asan
 abi_tag:
-  - cp315
+  - cp315_asan
 version:
   - 3.15
diff --git a/Tools/pixi-packages/build.sh b/Tools/pixi-packages/build.sh
index e6d96f7b0cb3d8..9d00afe311224e 100644
--- a/Tools/pixi-packages/build.sh
+++ b/Tools/pixi-packages/build.sh
@@ -1,25 +1,23 @@
 #!/bin/bash
 
+echo "PYTHON_VARIANT: ${PYTHON_VARIANT}"
+
 if [[ "${PYTHON_VARIANT}" == "freethreading" ]]; then
-    echo "BUILD TYPE: FREE-THREADING"
-    BUILD_DIR="../build_freethreading"
     CONFIGURE_EXTRA="--disable-gil"
 elif [[ "${PYTHON_VARIANT}" == "asan" ]]; then
-    echo "BUILD TYPE: ASAN"
-    BUILD_DIR="../build_asan"
     CONFIGURE_EXTRA="--with-address-sanitizer"
     export ASAN_OPTIONS="strict_init_order=true"
 elif [[ "${PYTHON_VARIANT}" == "tsan-freethreading" ]]; then
-    echo "BUILD TYPE: TSAN FREE-THREADING"
-    BUILD_DIR="../build_tsan-freethreading"
     CONFIGURE_EXTRA="--disable-gil --with-thread-sanitizer"
     export TSAN_OPTIONS="suppressions=${SRC_DIR}/Tools/tsan/suppressions_free_threading.txt"
-else
-    echo "BUILD TYPE: DEFAULT"
-    BUILD_DIR="../build"
+elif [[ "${PYTHON_VARIANT}" == "default" ]]; then
     CONFIGURE_EXTRA=""
+else
+    echo "Unknown PYTHON_VARIANT: ${PYTHON_VARIANT}"
+    exit 1
 fi
 
+BUILD_DIR="../build_${PYTHON_VARIANT}"
 mkdir -p "${BUILD_DIR}"
 cd "${BUILD_DIR}"
 
diff --git a/Tools/pixi-packages/default/recipe.yaml b/Tools/pixi-packages/default/recipe.yaml
index 7120c5f2a369a2..a5609540ae7f68 100644
--- a/Tools/pixi-packages/default/recipe.yaml
+++ b/Tools/pixi-packages/default/recipe.yaml
@@ -13,16 +13,16 @@ outputs:
     name: python_abi
     version: ${{ version }}
   build:
-    string: "0_${{ variant }}_${{ abi_tag }}"
+    string: "0_${{ abi_tag }}"
   requirements:
     run_constraints:
-      - python ${{ version }}.* *_${{ variant }}_${{ abi_tag }}
+      - python ${{ version }}.* *_${{ abi_tag }}
 
 - package:
     name: python
     version: ${{ version }}
   build:
-    string: "0_${{ variant }}_${{ abi_tag }}"
+    string: "0_${{ abi_tag }}"
     files:
       exclude:
         - "*.o"
@@ -77,7 +77,7 @@ outputs:
       noarch:
         - python
       weak:
-        - python_abi ${{ version }}.* *_${{ variant }}_${{ abi_tag }}
+        - python_abi ${{ version }}.* *_${{ abi_tag }}
 
 about:
   homepage: https://www.python.org/
diff --git a/Tools/pixi-packages/tsan-freethreading/variants.yaml b/Tools/pixi-packages/tsan-freethreading/variants.yaml
index 74e02f2e580320..481c7298a34304 100644
--- a/Tools/pixi-packages/tsan-freethreading/variants.yaml
+++ b/Tools/pixi-packages/tsan-freethreading/variants.yaml
@@ -1,6 +1,6 @@
 variant:
   - tsan-freethreading
 abi_tag:
-  - cp315t
+  - cp315t_tsan
 version:
   - 3.15

From 2402f77e332034607c4697ad19df1f0513de6e75 Mon Sep 17 00:00:00 2001
From: crusaderky <crusaderky@gmail.com>
Date: Wed, 14 Jan 2026 15:26:40 +0000
Subject: [PATCH 12/15] switch ABI tag for asan/tsan

---
 Tools/pixi-packages/asan/variants.yaml               | 2 +-
 Tools/pixi-packages/tsan-freethreading/variants.yaml | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/Tools/pixi-packages/asan/variants.yaml b/Tools/pixi-packages/asan/variants.yaml
index a4eb28b70c5b69..2404948457e6bb 100644
--- a/Tools/pixi-packages/asan/variants.yaml
+++ b/Tools/pixi-packages/asan/variants.yaml
@@ -1,6 +1,6 @@
 variant:
   - asan
 abi_tag:
-  - cp315_asan
+  - asan_cp315
 version:
   - 3.15
diff --git a/Tools/pixi-packages/tsan-freethreading/variants.yaml b/Tools/pixi-packages/tsan-freethreading/variants.yaml
index 481c7298a34304..6ed09fcc9b656b 100644
--- a/Tools/pixi-packages/tsan-freethreading/variants.yaml
+++ b/Tools/pixi-packages/tsan-freethreading/variants.yaml
@@ -1,6 +1,6 @@
 variant:
   - tsan-freethreading
 abi_tag:
-  - cp315t_tsan
+  - tsan_cp315t
 version:
   - 3.15

From 56f4403960f9e4e774d20d41d43c0f5f58cfffd2 Mon Sep 17 00:00:00 2001
From: crusaderky <crusaderky@gmail.com>
Date: Wed, 14 Jan 2026 15:28:50 +0000
Subject: [PATCH 13/15] git cleanup 1/2

---
 Tools/pixi-packages/asan/pixi.toml                 | 13 -------------
 Tools/pixi-packages/asan/recipe.yaml               |  1 -
 Tools/pixi-packages/freethreading/pixi.toml        | 13 -------------
 Tools/pixi-packages/freethreading/recipe.yaml      |  1 -
 Tools/pixi-packages/tsan-freethreading/pixi.toml   |  1 -
 Tools/pixi-packages/tsan-freethreading/recipe.yaml |  1 -
 6 files changed, 30 deletions(-)
 delete mode 100644 Tools/pixi-packages/asan/pixi.toml
 delete mode 120000 Tools/pixi-packages/asan/recipe.yaml
 delete mode 100644 Tools/pixi-packages/freethreading/pixi.toml
 delete mode 120000 Tools/pixi-packages/freethreading/recipe.yaml
 delete mode 120000 Tools/pixi-packages/tsan-freethreading/pixi.toml
 delete mode 120000 Tools/pixi-packages/tsan-freethreading/recipe.yaml

diff --git a/Tools/pixi-packages/asan/pixi.toml b/Tools/pixi-packages/asan/pixi.toml
deleted file mode 100644
index 7c8200067d8cdf..00000000000000
--- a/Tools/pixi-packages/asan/pixi.toml
+++ /dev/null
@@ -1,13 +0,0 @@
-[workspace]
-channels = ["https://prefix.dev/conda-forge"]
-platforms = ["osx-arm64", "linux-64"]
-preview = ["pixi-build"]
-
-[workspace.build-variants]
-variant = ["asan"]
-abi_tag = ["cp315"]
-version = ["3.15"]
-
-[package.build.backend]
-name = "pixi-build-rattler-build"
-version = "*"
diff --git a/Tools/pixi-packages/asan/recipe.yaml b/Tools/pixi-packages/asan/recipe.yaml
deleted file mode 120000
index 90c5c497965560..00000000000000
--- a/Tools/pixi-packages/asan/recipe.yaml
+++ /dev/null
@@ -1 +0,0 @@
-../default/recipe.yaml
\ No newline at end of file
diff --git a/Tools/pixi-packages/freethreading/pixi.toml b/Tools/pixi-packages/freethreading/pixi.toml
deleted file mode 100644
index a6369b02059572..00000000000000
--- a/Tools/pixi-packages/freethreading/pixi.toml
+++ /dev/null
@@ -1,13 +0,0 @@
-[workspace]
-channels = ["https://prefix.dev/conda-forge"]
-platforms = ["osx-arm64", "linux-64"]
-preview = ["pixi-build"]
-
-[workspace.build-variants]
-variant = ["freethreading"]
-abi_tag = ["cp315t"]
-version = ["3.15"]
-
-[package.build.backend]
-name = "pixi-build-rattler-build"
-version = "*"
diff --git a/Tools/pixi-packages/freethreading/recipe.yaml b/Tools/pixi-packages/freethreading/recipe.yaml
deleted file mode 120000
index 90c5c497965560..00000000000000
--- a/Tools/pixi-packages/freethreading/recipe.yaml
+++ /dev/null
@@ -1 +0,0 @@
-../default/recipe.yaml
\ No newline at end of file
diff --git a/Tools/pixi-packages/tsan-freethreading/pixi.toml b/Tools/pixi-packages/tsan-freethreading/pixi.toml
deleted file mode 120000
index 3d713eb33ae811..00000000000000
--- a/Tools/pixi-packages/tsan-freethreading/pixi.toml
+++ /dev/null
@@ -1 +0,0 @@
-../default/pixi.toml
\ No newline at end of file
diff --git a/Tools/pixi-packages/tsan-freethreading/recipe.yaml b/Tools/pixi-packages/tsan-freethreading/recipe.yaml
deleted file mode 120000
index 90c5c497965560..00000000000000
--- a/Tools/pixi-packages/tsan-freethreading/recipe.yaml
+++ /dev/null
@@ -1 +0,0 @@
-../default/recipe.yaml
\ No newline at end of file

From 546dcc064796a55ea6b258d032aede6c895aea19 Mon Sep 17 00:00:00 2001
From: crusaderky <crusaderky@gmail.com>
Date: Wed, 14 Jan 2026 15:29:58 +0000
Subject: [PATCH 14/15] git cleanup 2/2

---
 Tools/pixi-packages/asan/pixi.toml                 | 1 +
 Tools/pixi-packages/asan/recipe.yaml               | 1 +
 Tools/pixi-packages/freethreading/pixi.toml        | 1 +
 Tools/pixi-packages/freethreading/recipe.yaml      | 1 +
 Tools/pixi-packages/tsan-freethreading/pixi.toml   | 1 +
 Tools/pixi-packages/tsan-freethreading/recipe.yaml | 1 +
 6 files changed, 6 insertions(+)
 create mode 120000 Tools/pixi-packages/asan/pixi.toml
 create mode 120000 Tools/pixi-packages/asan/recipe.yaml
 create mode 120000 Tools/pixi-packages/freethreading/pixi.toml
 create mode 120000 Tools/pixi-packages/freethreading/recipe.yaml
 create mode 120000 Tools/pixi-packages/tsan-freethreading/pixi.toml
 create mode 120000 Tools/pixi-packages/tsan-freethreading/recipe.yaml

diff --git a/Tools/pixi-packages/asan/pixi.toml b/Tools/pixi-packages/asan/pixi.toml
new file mode 120000
index 00000000000000..3d713eb33ae811
--- /dev/null
+++ b/Tools/pixi-packages/asan/pixi.toml
@@ -0,0 +1 @@
+../default/pixi.toml
\ No newline at end of file
diff --git a/Tools/pixi-packages/asan/recipe.yaml b/Tools/pixi-packages/asan/recipe.yaml
new file mode 120000
index 00000000000000..90c5c497965560
--- /dev/null
+++ b/Tools/pixi-packages/asan/recipe.yaml
@@ -0,0 +1 @@
+../default/recipe.yaml
\ No newline at end of file
diff --git a/Tools/pixi-packages/freethreading/pixi.toml b/Tools/pixi-packages/freethreading/pixi.toml
new file mode 120000
index 00000000000000..3d713eb33ae811
--- /dev/null
+++ b/Tools/pixi-packages/freethreading/pixi.toml
@@ -0,0 +1 @@
+../default/pixi.toml
\ No newline at end of file
diff --git a/Tools/pixi-packages/freethreading/recipe.yaml b/Tools/pixi-packages/freethreading/recipe.yaml
new file mode 120000
index 00000000000000..90c5c497965560
--- /dev/null
+++ b/Tools/pixi-packages/freethreading/recipe.yaml
@@ -0,0 +1 @@
+../default/recipe.yaml
\ No newline at end of file
diff --git a/Tools/pixi-packages/tsan-freethreading/pixi.toml b/Tools/pixi-packages/tsan-freethreading/pixi.toml
new file mode 120000
index 00000000000000..3d713eb33ae811
--- /dev/null
+++ b/Tools/pixi-packages/tsan-freethreading/pixi.toml
@@ -0,0 +1 @@
+../default/pixi.toml
\ No newline at end of file
diff --git a/Tools/pixi-packages/tsan-freethreading/recipe.yaml b/Tools/pixi-packages/tsan-freethreading/recipe.yaml
new file mode 120000
index 00000000000000..90c5c497965560
--- /dev/null
+++ b/Tools/pixi-packages/tsan-freethreading/recipe.yaml
@@ -0,0 +1 @@
+../default/recipe.yaml
\ No newline at end of file

From cd4cd26dd2ce2b57a919777fc0cec9de1c671f55 Mon Sep 17 00:00:00 2001
From: crusaderky <crusaderky@gmail.com>
Date: Thu, 15 Jan 2026 13:09:29 +0000
Subject: [PATCH 15/15] README

---
 Tools/pixi-packages/README.md | 25 ++++++++++++++++---------
 1 file changed, 16 insertions(+), 9 deletions(-)

diff --git a/Tools/pixi-packages/README.md b/Tools/pixi-packages/README.md
index 4cd48da0715cf9..e096cd1ae9ff5f 100644
--- a/Tools/pixi-packages/README.md
+++ b/Tools/pixi-packages/README.md
@@ -1,14 +1,16 @@
 # CPython Pixi packages
 
-This directory contains definitions for [Pixi packages](https://pixi.sh/latest/reference/pixi_manifest/#the-package-section)
-which can be built from the CPython source code.
+This directory contains definitions for [Pixi
+packages](https://pixi.sh/latest/reference/pixi_manifest/#the-package-section) which can
+be built from the CPython source code.
 
-Downstream developers can make use of these packages by adding them as Git dependencies in a
-[Pixi workspace](https://pixi.sh/latest/first_workspace/), like:
+Downstream developers can make use of these packages by adding them as Git dependencies
+in a [Pixi workspace](https://pixi.sh/latest/first_workspace/), like:
 
 ```toml
 [dependencies]
-python = { git = "https://github.com/python/cpython", subdirectory = "Tools/pixi-packages/asan" }
+python.git = "https://github.com/python/cpython"
+python.subdirectory = "Tools/pixi-packages/asan"
 ```
 
 This is particularly useful when developers need to build CPython from source
@@ -22,19 +24,24 @@ Each package definition is contained in a subdirectory, but they share the build
 - `default`
 - `freethreading`
 - `asan`: ASan-instrumented build
-- `tsan_freethreading`: TSan-instrumented free-threading build
+- `tsan-freethreading`: TSan-instrumented free-threading build
 
 ## Maintenance
 
-- Keep the `abi_tag` and `version` fields in each `pixi.toml` up to date with the Python version
+- Keep the `abi_tag` and `version` fields in each `variants.yaml` up to date with the
+  Python version
 - Update `build.sh` for any breaking changes in the `configure` and `make` workflow
 
 ## Opportunities for future improvement
 
 - More package variants (such as UBSan)
 - Support for Windows
-- Using a single `pixi.toml` and `recipe.yaml` for all package variants is blocked on https://github.com/prefix-dev/pixi/issues/4599
-- A workaround can be removed from the build script once https://github.com/prefix-dev/rattler-build/issues/2012 is resolved
+- Using a single `pixi.toml` and `recipe.yaml` for all package variants is blocked on
+  [pixi-build-backends#532](https://github.com/prefix-dev/pixi-build-backends/pull/532)
+  and [pixi#5248](https://github.com/prefix-dev/pixi/issues/5248)
+- A workaround can be removed from the build script once
+  [rattler-build#2012](https://github.com/prefix-dev/rattler-build/issues/2012) is
+  resolved
 
 ## Troubleshooting