Clang's integrated assembler produces the warning for assembly files:
warning: DWARF2 only supports one section per compilation unit
If -Wa,-gdwarf-* is unspecified, then debug info is not emitted. This will be re-enabled for new DWARF versions in a follow up patch.
Enables defconfig+CONFIG_DEBUG_INFO to build cleanly with LLVM=1 LLVM_IAS=1 for x86_64 and arm64.
Cc: stable@vger.kernel.org Link: https://github.com/ClangBuiltLinux/linux/issues/716 Reported-by: Nathan Chancellor natechancellor@gmail.com Suggested-by: Dmitry Golovin dima@golovin.in Suggested-by: Sedat Dilek sedat.dilek@gmail.com Signed-off-by: Nick Desaulniers ndesaulniers@google.com --- Makefile | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/Makefile b/Makefile index f353886dbf44..75b1a3dcbf30 100644 --- a/Makefile +++ b/Makefile @@ -826,7 +826,9 @@ else DEBUG_CFLAGS += -g endif
+ifndef LLVM_IAS KBUILD_AFLAGS += -Wa,-gdwarf-2 +endif
ifdef CONFIG_DEBUG_INFO_DWARF4 DEBUG_CFLAGS += -gdwarf-4