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kbuild: check CONFIG_AS_IS_LLVM instead of LLVM_IAS
LLVM_IAS is the user interface to set the -(no-)integrated-as flag,
and it should be used only for that purpose.
LLVM_IAS is checked in some places to determine the assembler type,
but it is not precise.
For example,
$ make CC=gcc LLVM_IAS=1
... will use the GNU assembler (i.e. binutils) since LLVM_IAS=1 is
effective only when $(CC) is clang.
Of course, 'CC=gcc LLVM_IAS=1' is an odd combination, but the build
system can be more robust against such insane input.
Commit ba64beb174
("kbuild: check the minimum assembler version in
Kconfig") introduced CONFIG_AS_IS_GNU/LLVM, which is more precise
because Kconfig checks the version string from the assembler in use.
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Reviewed-by: Nathan Chancellor <nathan@kernel.org>
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2
Makefile
2
Makefile
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@ -843,7 +843,7 @@ else
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DEBUG_CFLAGS += -g
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endif
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ifneq ($(LLVM_IAS),1)
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ifndef CONFIG_AS_IS_LLVM
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KBUILD_AFLAGS += -Wa,-gdwarf-2
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endif
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@ -41,7 +41,7 @@ endif
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ifeq ($(CONFIG_LD_IS_LLD),y)
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KBUILD_CFLAGS += -mno-relax
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KBUILD_AFLAGS += -mno-relax
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ifneq ($(LLVM_IAS),1)
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ifndef CONFIG_AS_IS_LLVM
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KBUILD_CFLAGS += -Wa,-mno-relax
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KBUILD_AFLAGS += -Wa,-mno-relax
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endif
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