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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug lto/52634] multiple definition error when using alias
Date: Tue, 20 Mar 2012 14:56:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52634

Richard Guenther <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2012-03-20
     Ever Confirmed|0                           |1

--- Comment #4 from Richard Guenther <rguenth at gcc dot gnu.org> 2012-03-20 14:42:33 UTC ---
Reduced testcase:

t1.c
----
extern int cfliteValueCallBacks;
void baz (int *);
int main () { baz(&cfliteValueCallBacks); }

t2.c
----
int cfliteKeyCallBacks = 5;
extern int cfliteValueCallBacks __attribute__((alias("cfliteKeyCallBacks")));

fails as:

gcc-4.7 -flto -flto-partition=1to1 t1.c t2.c -r -nostdlib
/tmp/ccPs2Uvd.ltrans1.ltrans.o:(.bss+0x0): multiple definition of
`cfliteKeyCallBacks'
/tmp/ccPs2Uvd.ltrans0.ltrans.o:(.data+0x0): first defined here
collect2: error: ld returned 1 exit status

Not sure if the source is valid by design.