From 62015d1c40d3fbee1495994c9baf8ae7f1318b9a Mon Sep 17 00:00:00 2001 From: Nick Desaulniers Date: Mon, 9 Nov 2020 10:35:28 -0800 Subject: [PATCH] FROMLIST: 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. Reported-by: Dmitry Golovin Reported-by: Nathan Chancellor Suggested-by: Dmitry Golovin Suggested-by: Nathan Chancellor Suggested-by: Sedat Dilek Signed-off-by: Nick Desaulniers Reviewed-by: Fangrui Song Reviewed-by: Nathan Chancellor Cc: Link: https://github.com/ClangBuiltLinux/linux/issues/716 Bug: 141693040 Link: https://lore.kernel.org/lkml/20201109183528.1391885-1-ndesaulniers@google.com/ Signed-off-by: Nick Desaulniers Change-Id: I55c8ad79dfeaae478c8de52d484e76fb2e37c194 --- Makefile | 2 ++ 1 file changed, 2 insertions(+) diff --git a/Makefile b/Makefile index 1b141b70ac5c..0e30a1aa49ce 100644 --- a/Makefile +++ b/Makefile @@ -829,7 +829,9 @@ else DEBUG_CFLAGS += -g endif +ifneq ($(LLVM_IAS),1) KBUILD_AFLAGS += -Wa,-gdwarf-2 +endif ifdef CONFIG_DEBUG_INFO_DWARF4 DEBUG_CFLAGS += -gdwarf-4