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| author | Nick Desaulniers <ndesaulniers@google.com> | 2020-11-09 10:35:28 -0800 |
|---|---|---|
| committer | Masahiro Yamada <masahiroy@kernel.org> | 2020-11-25 03:41:26 +0900 |
| commit | b8a9092330da2030496ff357272f342eb970d51b (patch) | |
| tree | 15c4ebd6b79ba35f82ff57d5fd429a651f7b0471 /Makefile | |
| parent | a716bd7432106aed82a751409d7be851a23022ac (diff) | |
| download | lwn-b8a9092330da2030496ff357272f342eb970d51b.tar.gz lwn-b8a9092330da2030496ff357272f342eb970d51b.zip | |
Kbuild: do not emit debug info for assembly with LLVM_IAS=1
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 for
assembly sources (it is still emitted for C sources). This will be
re-enabled for newer 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: Dmitry Golovin <dima@golovin.in>
Reported-by: Nathan Chancellor <natechancellor@gmail.com>
Suggested-by: Dmitry Golovin <dima@golovin.in>
Suggested-by: Nathan Chancellor <natechancellor@gmail.com>
Suggested-by: Sedat Dilek <sedat.dilek@gmail.com>
Reviewed-by: Fangrui Song <maskray@google.com>
Reviewed-by: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Diffstat (limited to 'Makefile')
| -rw-r--r-- | Makefile | 2 |
1 files changed, 2 insertions, 0 deletions
@@ -828,7 +828,9 @@ else DEBUG_CFLAGS += -g endif +ifneq ($(LLVM_IAS),1) KBUILD_AFLAGS += -Wa,-gdwarf-2 +endif ifdef CONFIG_DEBUG_INFO_DWARF4 DEBUG_CFLAGS += -gdwarf-4 |