http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49992
--- Comment #30 from Iain Sandoe <iains at gcc dot gnu.org> 2011-08-09 18:57:36
UTC ---
so, if we have no regressions from omitting the "-c" we might conclude that
things have changed since then ;-)
===
simple testcase:
$ cat /Volumes/ScratchCS/tests/statlib.c
int common_symbol;
int libfunc (int a)
{
return a + common_symbol;
}
$ cat /Volumes/ScratchCS/tests/main-using-common-sym.c
int common_symbol ;
int main (int ac, char *av[])
{
int a;
a = ac + 5;
common_symbol = a - 6;
return common_symbol;
}
===
$ uname -v
Darwin Kernel Version 10.8.0: Tue Jun 7 16:33:36 PDT 2011;
root:xnu-1504.15.3~1/RELEASE_I386
$ ./gcc/xgcc --version
xgcc (GCC) 4.7.0 20110806 (experimental) [trunk revision 177536]
$ ./gcc/xgcc -Bgcc /Volumes/ScratchCS/tests/statlib.c -c
$ ar -cru libstat.a statlib.o
$ ranlib libstat.a
$ ./gcc/xgcc -Bgcc /Volumes/ScratchCS/tests/main-using-common-sym.c -c
$ ./gcc/xgcc -Bgcc main-using-common-sym.o -o tt -Wl,-why_load
<no output>
$ ./gcc/xgcc -Bgcc main-using-common-sym.o libstat.a -o tt -Wl,-why_load
<no output>
$ ranlib -c libstat.a
$ ./gcc/xgcc -Bgcc main-using-common-sym.o libstat.a -o tt -Wl,-why_load
_common_symbol forced load of libstat.a(statlib.o)
OK.. so there's your reduced testcase.
(on Darwin 9 there's no output in either case).
