Hi Masahiro, I would appreciate any feedback you have on this patch.
On Fri, Nov 20, 2020 at 3:58 PM Jian Cai jiancai@google.com wrote:
I also verified that with this patch Chrome OS devices booted with either GNU assembler or LLVM's integrated assembler. With this patch, IAS no longer produces extra warnings compared to GNU as on Chrome OS and would remove the last blocker of enabling IAS on it.
Tested-by: Jian Cai jiancai@google.com # Compile-tested on mainline (with defconfig) and boot-tested on ChromeOS (with olddefconfig).
On Mon, Nov 16, 2020 at 3:41 PM 'Nick Desaulniers' via Clang Built Linux clang-built-linux@googlegroups.com wrote:
Hi Masahiro, have you had time to review v3 of this patch?
On Mon, Nov 9, 2020 at 10:35 AM Nick Desaulniers ndesaulniers@google.com wrote:
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
Makefile | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/Makefile b/Makefile index f353886dbf44..7e899d356902 100644 --- a/Makefile +++ b/Makefile @@ -826,7 +826,9 @@ else DEBUG_CFLAGS += -g endif
+ifneq ($(LLVM_IAS),1) KBUILD_AFLAGS += -Wa,-gdwarf-2 +endif
ifdef CONFIG_DEBUG_INFO_DWARF4 DEBUG_CFLAGS += -gdwarf-4 -- 2.29.2.222.g5d2a92d10f8-goog
-- Thanks, ~Nick Desaulniers
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