lkml.org 
[lkml]   [2020]   [Dec]   [28]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    From
    Subject[PATCH 4.19 001/346] Kbuild: do not emit debug info for assembly with LLVM_IAS=1
    Date
    From: Nick Desaulniers <ndesaulniers@google.com>

    commit b8a9092330da2030496ff357272f342eb970d51b upstream.

    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>
    [nd: backport to avoid conflicts from:
    commit 10e68b02c861 ("Makefile: support compressed debug info")
    commit 7b16994437c7 ("Makefile: Improve compressed debug info support detection")
    commit 695afd3d7d58 ("kbuild: Simplify DEBUG_INFO Kconfig handling")]
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    Makefile | 3 +++
    1 file changed, 3 insertions(+)

    --- a/Makefile
    +++ b/Makefile
    @@ -745,8 +745,11 @@ KBUILD_CFLAGS += $(call cc-option, -gs
    else
    KBUILD_CFLAGS += -g
    endif
    +ifneq ($(LLVM_IAS),1)
    KBUILD_AFLAGS += -Wa,-gdwarf-2
    endif
    +endif
    +
    ifdef CONFIG_DEBUG_INFO_DWARF4
    KBUILD_CFLAGS += $(call cc-option, -gdwarf-4,)
    endif

    \
     
     \ /
      Last update: 2020-12-28 14:20    [W:4.126 / U:0.072 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site