[Bug lto/43355] New: Undefined references with -flto -fuse-linker-plugin, dependent on object file ordering

[amonakov at gcc dot gnu dot org]

cat <<EOF >a.c 
extern int puts(const char*);
char *program;
void fail() {puts(program);}
EOF
cat <<EOF >b.c 
extern int puts(const char*);
extern char *program;
extern void fail();
void usage() {puts(program);}
int main(int argc, char *argv[])
{
  program = argv[0];
  if (argc)
    usage();
  else
    fail();
  return 0;
}
EOF

gcc -flto -fuse-linker-plugin -O2 b.c a.c 
/usr/lib/gcc/x86_64-pc-linux-gnu/4.5.0-pre9999/../../../../x86_64-pc-linux-gnu/bin/ld:
/tmp/ccvkxseZ.lto.o: in function usage:ccHTGBCK.o(.text+0x3): error: undefined
reference to 'program'
/usr/lib/gcc/x86_64-pc-linux-gnu/4.5.0-pre9999/../../../../x86_64-pc-linux-gnu/bin/ld:
/tmp/ccvkxseZ.lto.o: in function fail:ccHTGBCK.o(.text+0x13): error: undefined
reference to 'program'
/usr/lib/gcc/x86_64-pc-linux-gnu/4.5.0-pre9999/../../../../x86_64-pc-linux-gnu/bin/ld:
/tmp/ccvkxseZ.lto.o: in function main:ccHTGBCK.o(.text+0x2c): error: undefined
reference to 'program'
collect2: ld returned 1 exit status

Works with reversed ordering or without -fuse-linker-plugin


-- 
           Summary: Undefined references with -flto -fuse-linker-plugin,
                    dependent on object file ordering
           Product: gcc
           Version: 4.5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: lto
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: amonakov at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43355