From: Masahiro Yamada masahiroy@kernel.org
commit 52cc02b910284d6bddba46cce402044ab775f314 upstream.
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 $(CC) is clang.
Of course, 'CC=gcc LLVM_IAS=1' is an odd combination, but the build system can be more robust against such insane input.
Commit ba64beb17493a ("kbuild: check the minimum assembler version in Kconfig") introduced CONFIG_AS_IS_GNU/LLVM, which is more precise because Kconfig checks the version string from the assembler in use.
Signed-off-by: Masahiro Yamada masahiroy@kernel.org Reviewed-by: Nick Desaulniers ndesaulniers@google.com Reviewed-by: Nathan Chancellor nathan@kernel.org [nathan: Backport to 5.10] Signed-off-by: Nathan Chancellor nathan@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- Makefile | 2 +- arch/riscv/Makefile | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-)
--- a/Makefile +++ b/Makefile @@ -851,7 +851,7 @@ else DEBUG_CFLAGS += -g endif
-ifeq ($(LLVM_IAS),1) +ifdef CONFIG_AS_IS_LLVM KBUILD_AFLAGS += -g else KBUILD_AFLAGS += -Wa,-gdwarf-2 --- a/arch/riscv/Makefile +++ b/arch/riscv/Makefile @@ -40,7 +40,7 @@ ifeq ($(CONFIG_LD_IS_LLD),y) ifeq ($(shell test $(CONFIG_LLD_VERSION) -lt 150000; echo $$?),0) KBUILD_CFLAGS += -mno-relax KBUILD_AFLAGS += -mno-relax -ifneq ($(LLVM_IAS),1) +ifndef CONFIG_AS_IS_LLVM KBUILD_CFLAGS += -Wa,-mno-relax KBUILD_AFLAGS += -Wa,-mno-relax endif