linux-kernel - [PATCH] xfs: stop CONFIG_XFS_DEBUG from changing compiler flags

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Message-Id: <20200409080909.3646059-1-arnd@arndb.de>
Date:   Thu,  9 Apr 2020 10:08:56 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     "Darrick J. Wong" <darrick.wong@...cle.com>,
        linux-xfs@...r.kernel.org
Cc:     Arnd Bergmann <arnd@...db.de>,
        Christoph Hellwig <hch@...radead.org>,
        Brian Foster <bfoster@...hat.com>,
        Dave Chinner <dchinner@...hat.com>,
        Eric Sandeen <sandeen@...hat.com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH] xfs: stop CONFIG_XFS_DEBUG from changing compiler flags

I ran into a linker warning in XFS that originates from a mismatch
between libelf, binutils and objtool when certain files in the kernel
are built with "gcc -g":

x86_64-linux-ld: fs/xfs/xfs_trace.o: unable to initialize decompress status for section .debug_info

After some discussion, nobody could identify why xfs sets this flag
here. CONFIG_XFS_DEBUG used to enable lots of unrelated settings, but
now its main purpose is to enable extra consistency checks and assertions
that are unrelated to the debug info.

Remove the Makefile logic to set the flag here. If anyone relies
on the debug info, this can simply be enabled again with the global
CONFIG_DEBUG_INFO option.

Suggested-by: Christoph Hellwig <hch@...radead.org>
Link: https://lore.kernel.org/lkml/20200409074130.GD21033@infradead.org/
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 fs/xfs/Makefile | 2 --
 1 file changed, 2 deletions(-)

diff --git a/fs/xfs/Makefile b/fs/xfs/Makefile
index 4f95df476181..ff94fb90a2ee 100644
--- a/fs/xfs/Makefile
+++ b/fs/xfs/Makefile
@@ -7,8 +7,6 @@
 ccflags-y += -I $(srctree)/$(src)		# needed for trace events
 ccflags-y += -I $(srctree)/$(src)/libxfs
 
-ccflags-$(CONFIG_XFS_DEBUG) += -g
-
 obj-$(CONFIG_XFS_FS)		+= xfs.o
 
 # this one should be compiled first, as the tracing macros can easily blow up
-- 
2.26.0