driver/travis: Replace AS=clang with LLVM_IAS=1

.travis.yml

@@ -54,8 +54,8 @@ jobs:
     - name: "ARCH=ppc64le LD=ld.lld REPO=linux-next"
       env: ARCH=ppc64le LD=ld.lld REPO=linux-next
       if: type = cron
-    - name: "ARCH=riscv AS=clang REPO=linux-next BOOT=0"
-      env: ARCH=riscv AS=clang REPO=linux-next
+    - name: "ARCH=riscv LLVM_IAS=1 REPO=linux-next BOOT=0"
+      env: ARCH=riscv LLVM_IAS=1 REPO=linux-next
       if: type = cron
     - name: "ARCH=s390 BOOT=0 REPO=linux-next"
       env: ARCH=s390 REPO=linux-next
@@ -194,8 +194,8 @@ script:
   - |
     docker run \
         --env ARCH=${ARCH} \
-        --env AS=${AS} \
         --env LD=${LD} \
+        --env LLVM_IAS=${LLVM_IAS} \
         --env REPO=${REPO} \
         --rm \
         --workdir /travis \

driver.sh

@@ -5,7 +5,7 @@ set -eu
 setup_variables() {
   while [[ ${#} -ge 1 ]]; do
     case ${1} in
-      "AR="*|"ARCH="*|"AS="*|"CC="*|"LD="*|"NM"=*|"OBJDUMP"=*|"OBJSIZE"=*|"REPO="*) export "${1?}" ;;
+      "AR="*|"ARCH="*|"CC="*|"LD="*|"LLVM_IAS="*|"NM"=*|"OBJDUMP"=*|"OBJSIZE"=*|"REPO="*) export "${1?}" ;;
       "-c"|"--clean") cleanup=true ;;
       "-j"|"--jobs") shift; jobs=$1 ;;
       "-j"*) jobs=${1/-j} ;;
@@ -159,7 +159,6 @@ function update_boot_utils() {
 check_dependencies() {
   # Check for existence of needed binaries
   command -v nproc
-  command -v "${CROSS_COMPILE:-}"as
   command -v timeout
   command -v unbuffer
   command -v zstd
@@ -188,7 +187,10 @@ check_dependencies() {
   # avoid architecture specific selection logic.
 
   "${LD:="${CROSS_COMPILE:-}"ld}" --version
-  "${AS:="${CROSS_COMPILE:-}"as}" --version
+  if [[ -z "${LLVM_IAS:-}" ]]; then
+    LLVM_IAS=0
+    command -v "${CROSS_COMPILE:-}"as
+  fi
 
   if [[ -z "${CC:-}" ]]; then
     CC=clang
@@ -308,12 +310,12 @@ mako_reactor() {
   KBUILD_BUILD_HOST=clangbuiltlinux \
   make -j"${jobs:-$(nproc)}" \
        AR="${AR}" \
-       AS="${AS}" \
        CC="${CC}" \
        HOSTCC="${CC}" \
        HOSTLD="${HOSTLD:-ld}" \
        KCFLAGS="-Wno-implicit-fallthrough" \
        LD="${LD}" \
+       LLVM_IAS="${LLVM_IAS}" \
        NM="${NM}" \
        OBJCOPY="${OBJCOPY}" \
        OBJDUMP="${OBJDUMP}" \

usage.txt

@@ -13,8 +13,6 @@ Environment variables:
       If no AR value is specified, the script will attempt to set AR to
       llvm-ar-10 llvm-ar-9, llvm-ar-8, llvm-ar-7, llvm-ar, then
       ${CROSS_COMPILE}ar if they are found in PATH.
-  AS:
-      If no AS value is specified, ${CROSS_COMPILE}as is used.
   ARCH (required):
       If no ARCH value is specified, it's an error; there is no default.
       Currently, arm32_v7, arm32_v6, arm32_v5, arm64, mips, mipsel, ppc32,
@@ -25,6 +23,9 @@ Environment variables:
       in PATH.
   LD:
       If no LD value is specified, ${CROSS_COMPILE}ld is used.
+  LLVM_IAS:
+      If this is set to 1, the integrated assembler is used. No value means
+      ${CROSS_COMPILE}as is used for assembling.
   REPO:
       Nicknames for trees:
         linux (default)