linux-kernel - [PATCH v2 5/5] Makefile.debug: set -g unconditional on CONFIG_DEBUG_INFO

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Message-ID: <20220831184408.2778264-6-ndesaulniers@google.com>
Date:   Wed, 31 Aug 2022 11:44:08 -0700
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     Masahiro Yamada <masahiroy@...nel.org>
Cc:     Michal Marek <michal.lkml@...kovi.net>,
        Nathan Chancellor <nathan@...nel.org>,
        Tom Rix <trix@...hat.com>, linux-kbuild@...r.kernel.org,
        linux-kernel@...r.kernel.org, llvm@...ts.linux.dev, x86@...nel.org,
        Dmitrii Bundin <dmitrii.bundin.a@...il.com>,
        Fangrui Song <maskray@...gle.com>,
        Alexey Alexandrov <aalexand@...gle.com>,
        Bill Wendling <morbo@...gle.com>,
        Greg Thelen <gthelen@...gle.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Andi Kleen <ak@...ux.intel.com>
Subject: [PATCH v2 5/5] Makefile.debug: set -g unconditional on CONFIG_DEBUG_INFO_SPLIT

Dmitrii, Fangrui, and Mashahiro note:

  Before GCC 11 and Clang 12 -gsplit-dwarf implicitly uses -g2.

Fix CONFIG_DEBUG_INFO_SPLIT for gcc-11+ & clang-12+ which now need -g
specified in order for -gsplit-dwarf to work at all.

-gsplit-dwarf has been mutually exclusive with -g since support for
CONFIG_DEBUG_INFO_SPLIT was introduced in
commit 866ced950bcd ("kbuild: Support split debug info v4")
I don't think it ever needed to be.

Link: https://lore.kernel.org/lkml/20220815013317.26121-1-dmitrii.bundin.a@gmail.com/
Link: https://lore.kernel.org/lkml/CAK7LNARPAmsJD5XKAw7m_X2g7Fi-CAAsWDQiP7+ANBjkg7R7ng@mail.gmail.com/
Link: https://reviews.llvm.org/D80391
Cc: Andi Kleen <ak@...ux.intel.com>
Reported-by: Dmitrii Bundin <dmitrii.bundin.a@...il.com>
Reported-by: Fangrui Song <maskray@...gle.com>
Reported-by: Masahiro Yamada <masahiroy@...nel.org>
Suggested-by: Dmitrii Bundin <dmitrii.bundin.a@...il.com>
Signed-off-by: Nick Desaulniers <ndesaulniers@...gle.com>
---
Changes v1 -> v2:
* Add reference to 866ced950bcd, cc Andi, in commit message.

 scripts/Makefile.debug | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/scripts/Makefile.debug b/scripts/Makefile.debug
index 46e88f0ca998..b6eb532af3cc 100644
--- a/scripts/Makefile.debug
+++ b/scripts/Makefile.debug
@@ -1,10 +1,8 @@
-DEBUG_CFLAGS	:=
+DEBUG_CFLAGS	:= -g
+KBUILD_AFLAGS	+= -g
 
 ifdef CONFIG_DEBUG_INFO_SPLIT
 DEBUG_CFLAGS	+= -gsplit-dwarf
-else
-DEBUG_CFLAGS	+= -g
-KBUILD_AFLAGS	+= -g
 endif
 
 ifdef CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT
-- 
2.37.2.672.g94769d06f0-goog