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Commit 459c7a84 authored by Masahiro Yamada's avatar Masahiro Yamada Committed by Greg Kroah-Hartman
Browse files

kbuild: replace AS=clang with LLVM_IAS=1 



commit 7e20e47c70f810d678d02941fa3c671209c4ca97 upstream.

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: default avatarNick Desaulniers <ndesaulniers@google.com>
Signed-off-by: default avatarMasahiro Yamada <masahiroy@kernel.org>
Reviewed-by: default avatarNathan Chancellor <natechancellor@gmail.com>
Reviewed-by: default avatarNick Desaulniers <ndesaulniers@google.com>
Signed-off-by: default avatarNick Desaulniers <ndesaulniers@google.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 0fbcb129

Documentation/kbuild/llvm.rst

+4 −1
Original line number Diff line number Diff line
@@ -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

------------

Makefile

+2 −0
Original line number Diff line number Diff line
@@ -492,7 +492,9 @@ endif 
ifneq ($(GCC_TOOLCHAIN),)

CLANG_FLAGS	+= --gcc-toolchain=$(GCC_TOOLCHAIN)

endif

ifneq ($(LLVM_IAS),1)

CLANG_FLAGS	+= -no-integrated-as

endif

CLANG_FLAGS	+= -Werror=unknown-warning-option

KBUILD_CFLAGS	+= $(CLANG_FLAGS)

KBUILD_AFLAGS	+= $(CLANG_FLAGS)