This is a note to let you know that I've just added the patch titled
Kconfig.debug: add toolchain checks for DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
kconfig.debug-add-toolchain-checks-for-debug_info_dwarf_toolchain_default.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Tue Oct 18 08:47:40 AM CEST 2022
From: Masahiro Yamada <masahiroy@xxxxxxxxxx>
Date: Wed, 5 Oct 2022 01:29:04 +0900
Subject: Kconfig.debug: add toolchain checks for DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT
From: Masahiro Yamada <masahiroy@xxxxxxxxxx>
commit bb1435f3f575b5213eaf27434efa3971f51c01de upstream.
CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT does not give explicit
-gdwarf-* flag. The actual DWARF version is up to the toolchain.
The combination of GCC and GAS works fine, and Clang with the integrated
assembler is good too.
The combination of Clang and GAS is tricky, but at least, the -g flag
works for Clang <=13, which defaults to DWARF v4.
Clang 14 switched its default to DWARF v5.
Now, CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT has the same issue as
addressed by commit 98cd6f521f10 ("Kconfig: allow explicit opt in to
DWARF v5").
CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT=y for Clang >= 14 and
GAS < 2.35 produces a ton of errors like follows:
/tmp/main-c2741c.s: Assembler messages:
/tmp/main-c2741c.s:109: Error: junk at end of line, first unrecognized character is `"'
/tmp/main-c2741c.s:109: Error: file number less than one
Add 'depends on' to check toolchains.
Signed-off-by: Masahiro Yamada <masahiroy@xxxxxxxxxx>
Reviewed-by: Nathan Chancellor <nathan@xxxxxxxxxx>
[nathan: Fix conflict due to lack of f9b3cd24578401e]
Signed-off-by: Nathan Chancellor <nathan@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
lib/Kconfig.debug | 1 +
1 file changed, 1 insertion(+)
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -274,6 +274,7 @@ choice
config DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT
bool "Rely on the toolchain's implicit default DWARF version"
+ depends on !CC_IS_CLANG || AS_IS_LLVM || CLANG_VERSION < 140000 || (AS_IS_GNU && AS_VERSION >= 23502)
help
The implicit default version of DWARF debug info produced by a
toolchain changes over time.
Patches currently in stable-queue which might be from masahiroy@xxxxxxxxxx are
queue-5.15/lib-kconfig.debug-add-check-for-non-constant-.-s-u-leb128-support-to-dwarf5.patch
queue-5.15/kconfig.debug-simplify-the-dependency-of-debug_info_dwarf4-5.patch
queue-5.15/kconfig.debug-add-toolchain-checks-for-debug_info_dwarf_toolchain_default.patch
queue-5.15/kbuild-remove-the-target-in-signal-traps-when-interr.patch
queue-5.15/hardening-avoid-harmless-clang-option-under-config_init_stack_all_zero.patch
queue-5.15/kbuild-rpm-pkg-fix-breakage-when-v-1-is-used.patch
queue-5.15/hardening-remove-clang-s-enable-flag-for-ftrivial-auto-var-init-zero.patch
