Skip to content

Commit

Permalink
Kbuild: do not emit debug info for assembly with LLVM_IAS=1
Browse files Browse the repository at this point in the history 
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: ClangBuiltLinux#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>
  • Loading branch information
@nickdesaulniers @intel-lab-lkp
nickdesaulniers authored and intel-lab-lkp committed Nov 4, 2020
1 parent 56e516f commit 3ecad14
Showing 1 changed file with 2 additions and 0 deletions.
2 changes: 2 additions & 0 deletions Makefile
View file
Original file line number Diff line number Diff line change
Expand Up @@ -828,7 +828,9 @@ else
DEBUG_CFLAGS += -g
endif

ifndef LLVM_IAS
KBUILD_AFLAGS += -Wa,-gdwarf-2
endif

ifdef CONFIG_DEBUG_INFO_DWARF4
DEBUG_CFLAGS += -gdwarf-4
Expand Down

0 comments on commit 3ecad14

Please sign in to comment.