document FUSE_NFS_WORKAROUND define

Author: LoganDark

build.sh

@@ -47,6 +47,9 @@ case "$os" in
 	plat_files="$plat_files ../src/compat/dummy.c"
 	plat_files="$plat_files ../src/compat/clearenv.c "
 	plat_cflags="$plat_cflags -include ../src/compat/macosx.h"
+	# Fuse-T (kext-free FUSE) uses NFS internally, which stats every
+	# directory entry after readdir. Compile in a runtime check for
+	# this behavior that activates a workaround.
 	if [ "$server" = "fuse" ]; then
 		plat_cflags="$plat_cflags -DFUSE_NFS_WORKAROUND"
 	fi

src/tup/server/Tupfile

@@ -4,6 +4,9 @@ ifeq ($(TUP_SERVER),fuse)
 export PKG_CONFIG_PATH
 CFLAGS += `pkg-config fuse --cflags`
 ifeq (@(TUP_PLATFORM),macosx)
+# Fuse-T (kext-free FUSE) uses NFS internally, which stats every
+# directory entry after readdir. Compile in a runtime check for
+# this behavior that activates a workaround.
 CFLAGS += -DFUSE_NFS_WORKAROUND
 endif
 : foreach fuse_server.c fuse_fs.c master_fork.c symlink.c |> !cc |>