[Bug ld/13230] New: IRONLY_EXP incorrectly reported as IRONLY by gold when fat LTO files are used

[hubicka at gcc dot gnu.org]

http://sourceware.org/bugzilla/show_bug.cgi?id=13230

             Bug #: 13230
           Summary: IRONLY_EXP incorrectly reported as IRONLY by gold when
                    fat LTO files are used
           Product: binutils
           Version: 2.23 (HEAD)
            Status: NEW
          Severity: normal
          Priority: P2
         Component: ld
        AssignedTo: address@hidden
        ReportedBy: address@hidden
    Classification: Unclassified


This requires GCC patch to use new plugin interface. But the problem seems
quite clear. Gold is confusing reference from discarded section of fat LTO
object with real reference to the comdat symbol.

address@hidden:/abuild/jh/trunk-3/build-inst7/gcc> ./xgcc -B ./ -O2 t.o -flto
--save-temps
[Leaving LTRANS /tmp/cczdYmCj.args]
[Leaving LTRANS /tmp/ccCqokiD.ltrans.out]
[Leaving LTRANS /tmp/ccLoaOjG.args]
[Leaving LTRANS /tmp/ccCqokiD.ltrans0.o]
address@hidden:/abuild/jh/trunk-3/build-inst7/gcc> cat t.C
#include <stdio.h>
inline void test (void)
{
  printf("Do something\n");
}
void *optimize_me_away_at_lto = (void *)&test;
main ()
{
  test();
}
address@hidden:/abuild/jh/trunk-3/build-inst7/gcc> ./xgcc -B ./ -O2 t.C -flto
address@hidden:/abuild/jh/trunk-3/build-inst7/gcc> ./xgcc -B ./ -O2 t.o -flto
--save-temps
[Leaving LTRANS /tmp/ccURJfxM.args]
[Leaving LTRANS /tmp/ccJTd7um.ltrans.out]
[Leaving LTRANS /tmp/ccvoyXEC.args]
[Leaving LTRANS /tmp/ccJTd7um.ltrans0.o]
address@hidden:/abuild/jh/trunk-3/build-inst7/gcc> more t.res
1
t.o 2
171 4348d11c PREVAILING_DEF_IRONLY _Z4testv
177 4348d11c PREVAILING_DEF main
address@hidden:/abuild/jh/trunk-3/build-inst7/gcc>

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