[Bug ld/13244] GNU LD incorrectly complain about undefined hidden symbols with LTO

[hubicka at ucw dot cz]

http://sourceware.org/bugzilla/show_bug.cgi?id=13244

--- Comment #2 from hubicka at ucw dot cz 2011-10-06 18:45:42 UTC ---
address@hidden:/abuild/jh/trunk-3/build-inst7/gcc> cat t.c
extern __attribute__ ((visibility("hidden"))) int fooblah;

static
do_nothing (int param)
{ 
  if (param)
   fooblah = 1;
}

main()
{ 
  do_nothing (0);
}
address@hidden:/abuild/jh/trunk-3/build-inst7/gcc> ./xgcc -B ./ -O2 t.c 
-fno-early-inlining -flto -fuse-linker-plugin
address@hidden:/abuild/jh/trunk-3/build-inst7/gcc> ./xgcc -B ./ -O2 t.c 
-fno-early-inlining -flto -fuse-linker-plugin --shared
/abuild/jh/trunk-install/x86_64-unknown-linux-gnu/bin/ld: a.out: hidden symbol
`fooblah' isn't defined
/abuild/jh/trunk-install/x86_64-unknown-linux-gnu/bin/ld: final link failed:
Bad value
collect2: error: ld returned 1 exit status

With gold I get:
address@hidden:/abuild/jh/trunk-3/build-inst7/gcc> ./xgcc -B ./ -O2 t.c 
-fno-early-inlining -flto -fuse-linker-plugin --shared
address@hidden:/abuild/jh/trunk-3/build-inst7/gcc> 

because fooblah gets optimized out.

Honza

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