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| author | Masahiro Yamada <masahiroy@kernel.org> | 2020-04-08 03:36:22 +0200 |
|---|---|---|
| committer | Masahiro Yamada <masahiroy@kernel.org> | 2020-04-08 20:18:09 +0200 |
| commit | 7e20e47c70f810d678d02941fa3c671209c4ca97 (patch) | |
| tree | b3b9f8270783a25ae04761643b84055f527f9948 | |
| parent | kbuild: add dummy toolchains to enable all cc-option etc. in Kconfig (diff) | |
| download | linux-7e20e47c70f810d678d02941fa3c671209c4ca97.tar.xz linux-7e20e47c70f810d678d02941fa3c671209c4ca97.zip | |
kbuild: replace AS=clang with LLVM_IAS=1
The 'AS' variable is unused for building the kernel. Only the remaining
usage is to turn on the integrated assembler. A boolean flag is a better
fit for this purpose.
AS=clang was added for experts. So, I replaced it with LLVM_IAS=1,
breaking the backward compatibility.
Suggested-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Nathan Chancellor <natechancellor@gmail.com>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
| -rw-r--r-- | Documentation/kbuild/llvm.rst | 5 | ||||
| -rw-r--r-- | Makefile | 2 |
2 files changed, 5 insertions, 2 deletions
diff --git a/Documentation/kbuild/llvm.rst b/Documentation/kbuild/llvm.rst index eefbdfa3e4d9..450708534860 100644 --- a/Documentation/kbuild/llvm.rst +++ b/Documentation/kbuild/llvm.rst @@ -50,11 +50,14 @@ LLVM Utilities LLVM has substitutes for GNU binutils utilities. These can be invoked as additional parameters to `make`. - make CC=clang AS=clang LD=ld.lld AR=llvm-ar NM=llvm-nm STRIP=llvm-strip \\ + make CC=clang LD=ld.lld AR=llvm-ar NM=llvm-nm STRIP=llvm-strip \\ OBJCOPY=llvm-objcopy OBJDUMP=llvm-objdump OBJSIZE=llvm-size \\ READELF=llvm-readelf HOSTCC=clang HOSTCXX=clang++ HOSTAR=llvm-ar \\ HOSTLD=ld.lld +Currently, the integrated assembler is disabled by default. You can pass +`LLVM_IAS=1` to enable it. + Getting Help ------------ @@ -538,7 +538,7 @@ endif ifneq ($(GCC_TOOLCHAIN),) CLANG_FLAGS += --gcc-toolchain=$(GCC_TOOLCHAIN) endif -ifeq ($(if $(AS),$(shell $(AS) --version 2>&1 | head -n 1 | grep clang)),) +ifneq ($(LLVM_IAS),1) CLANG_FLAGS += -no-integrated-as endif CLANG_FLAGS += -Werror=unknown-warning-option |