Kbuild: do not emit debug info for assembly with LLVM_IAS=1
authorNick Desaulniers <ndesaulniers@google.com>
Mon, 9 Nov 2020 18:35:28 +0000 (10:35 -0800)
committerMasahiro Yamada <masahiroy@kernel.org>
Tue, 24 Nov 2020 18:41:26 +0000 (03:41 +0900)
commitb8a9092330da2030496ff357272f342eb970d51b
tree15c4ebd6b79ba35f82ff57d5fd429a651f7b0471
parenta716bd7432106aed82a751409d7be851a23022ac
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>
Makefile