When building mips tinyconifg the following warning show up
make --silent --keep-going --jobs=8 O=/home/anders/src/kernel/next/out/builddir ARCH=mips CROSS_COMPILE=mips-linux-gnu- HOSTCC=clang CC=clang /srv/src/kernel/next/arch/mips/vdso/elf.S:14:1: warning: DWARF2 only supports one section per compilation unit .pushsection .note.Linux, "a",@note ; .balign 4 ; .long 2f - 1f ; .long 4484f - 3f ; .long 0 ; 1:.asciz "Linux" ; 2:.balign 4 ; 3: ^ /srv/src/kernel/next/arch/mips/vdso/elf.S:34:2: warning: DWARF2 only supports one section per compilation unit .section .mips_abiflags, "a" ^
Rework so the mips vdso Makefile adds flag '-no-integrated-as' unless LLVM_IAS is defined.
Link: https://github.com/ClangBuiltLinux/linux/issues/1256 Cc: stable@vger.kernel.org # v4.19+ Suggested-by: Nick Desaulniers ndesaulniers@google.com Signed-off-by: Anders Roxell anders.roxell@linaro.org --- arch/mips/vdso/Makefile | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/arch/mips/vdso/Makefile b/arch/mips/vdso/Makefile index 5810cc12bc1d..83e8cf216ac8 100644 --- a/arch/mips/vdso/Makefile +++ b/arch/mips/vdso/Makefile @@ -26,6 +26,10 @@ ifdef CONFIG_CC_IS_CLANG ccflags-vdso += $(filter --target=%,$(KBUILD_CFLAGS)) endif
+ifneq ($(LLVM_IAS),1) +ccflags-vdso += -no-integrated-as +endif + # # The -fno-jump-tables flag only prevents the compiler from generating # jump tables but does not prevent the compiler from emitting absolute