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author | Chris Metcalf <cmetcalf@ezchip.com> | 2016-01-20 14:59:12 -0800 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-01-20 17:09:18 -0800 |
commit | f5948701891322770ad6ede317da5fc9cf33d2f0 (patch) | |
tree | 284fb3f9187e9ae46c13c1b65660967e873956f8 /scripts/checkpatch.pl | |
parent | 243c2137cda52599f6112f52b6be5e61fa6536ae (diff) | |
download | op-kernel-dev-f5948701891322770ad6ede317da5fc9cf33d2f0.zip op-kernel-dev-f5948701891322770ad6ede317da5fc9cf33d2f0.tar.gz |
lib/clz_tab.c: put in lib-y rather than obj-y
The clz table (__clz_tab) in lib/clz_tab.c is also provided as part of
libgcc.a, and many architectures link against libgcc. To allow the
linker to avoid a multiple-definition link failure, clz_tab.o has to be
in lib/lib.a rather than lib/builtin.o. The specific issue is that
libgcc.a comes before lib/builtin.o on vmlinux.o's link command line, so
its _clz.o is pulled to satisfy __clz_tab, and then when the remainder
of lib/builtin.o is pulled in to satisfy all the other dependencies, the
__clz_tab symbols conflict. By putting clz_tab.o in lib.a, the linker
can simply avoid pulling it into vmlinux.o when this situation arises.
The definitions of __clz_tab are the same in libgcc.a and in the kernel;
arguably we could also simply rename the kernel version, but it's
unlikely the libgcc version will ever change to become incompatible, so
just using it seems reasonably safe.
Signed-off-by: Chris Metcalf <cmetcalf@ezchip.com>
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'scripts/checkpatch.pl')
0 files changed, 0 insertions, 0 deletions