Issue
For debug info, I have these config options enabled:
/Volumes/git/linux (master)*$ grep CONFIG_DEBUG build/.config | grep -v ^#
CONFIG_DEBUG_ALIGN_RODATA=y
CONFIG_DEBUG_KERNEL=y
CONFIG_DEBUG_INFO=y
CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT=y
CONFIG_DEBUG_LL_INCLUDE="mach/debug-macro.S"
However the vmlinux file only includes debug info for .c and .h files and not .S files.
Is there a standard way to get debug info for the assembly files included in vmlinux?
update 8/2/2022:
I found that in scripts/Makefile.debug if you use LLVM/clang then debug info is excluded from assembly files for some reason.
ifndef CONFIG_AS_IS_LLVM
KBUILD_AFLAGS += -Wa,-gdwarf-2
endif
and removing the ifndef line fixed the missing debug info for me.
Why is ifndef CONFIG_AS_IS_LLVM there?
Solution
if building with llvm clang, remove ifndef CONFIG_AS_IS_LLVM and endif from around the KBUILD_AFLAGS
diff --git a/scripts/Makefile.debug b/scripts/Makefile.debug
index 9f39b0130551f..1a26df0538b5b 100644
--- a/scripts/Makefile.debug
+++ b/scripts/Makefile.debug
@@ -6,9 +6,7 @@ else
DEBUG_CFLAGS += -g
endif
-ifndef CONFIG_AS_IS_LLVM
KBUILD_AFLAGS += -Wa,-gdwarf-2
-endif
ifndef CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT
dwarf-version-$(CONFIG_DEBUG_INFO_DWARF4) := 4
Answered By - Bill Morgan Answer Checked By - Dawn Plyler (WPSolving Volunteer)