linux-kernel - [PATCH/RFC] sh: Always link in helper functions extracted from libgcc

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Date:	Wed, 29 May 2013 10:16:48 +0200
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Paul Mundt <lethal@...ux-sh.org>
Cc:	linux-sh@...r.kernel.org, linux-arch@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Geert Uytterhoeven <geert@...ux-m68k.org>
Subject: [PATCH/RFC] sh: Always link in helper functions extracted from libgcc

E.g. landisk_defconfig, which has CONFIG_NTFS_FS=m:

ERROR: "__ashrdi3" [fs/ntfs/ntfs.ko] undefined!

For "lib-y", if no symbols in a compilation unit are referenced by other
units, the compilation unit will not be included in vmlinux.
This breaks modules that do reference those symbols.

Use "obj-y" instead to fix this.

Signed-off-by: Geert Uytterhoeven <geert@...ux-m68k.org>
---
http://kisskb.ellerman.id.au/kisskb/buildresult/8838077/

This doesn't fix all cases. There are others, e.g. udivsi3.
This is also not limited to sh, many architectures handle this in the same
way.

A simple solution is to unconditionally include all helper functions.
A more complex solution is to make the choice of "lib-y" or "obj-y" depend
on CONFIG_MODULES:
  obj-$(CONFIG_MODULES) += ...
  lib-y($CONFIG_MODULES) += ...

What do you think?
Thanks for your comments!

 arch/sh/lib/Makefile |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/sh/lib/Makefile b/arch/sh/lib/Makefile
index 7b95f29..3baff31 100644
--- a/arch/sh/lib/Makefile
+++ b/arch/sh/lib/Makefile
@@ -6,7 +6,7 @@ lib-y  = delay.o memmove.o memchr.o \
 	 checksum.o strlen.o div64.o div64-generic.o

 # Extracted from libgcc
-lib-y += movmem.o ashldi3.o ashrdi3.o lshrdi3.o \
+obj-y += movmem.o ashldi3.o ashrdi3.o lshrdi3.o \
 	 ashlsi3.o ashrsi3.o ashiftrt.o lshrsi3.o \
 	 udiv_qrnnd.o

-- 
1.7.0.4

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