[Bug ld/23350] New: multiple prevailing defs for unused variable in lto mode

[mliska at suse dot cz]

https://sourceware.org/bugzilla/show_bug.cgi?id=23350

            Bug ID: 23350
           Summary: multiple prevailing defs for unused variable in lto
                    mode
           Product: binutils
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: ld
          Assignee: unassigned at sourceware dot org
          Reporter: mliska at suse dot cz
  Target Milestone: ---

Consider:

$ cat a.i
int wrl;

int main()
{
}

$ cat b.i
int wrl;
int wrl2;

$ cc -flto -O2 -c a.i
$ cc -flto -O2 -c b.i
$ ar rusc libpes.a b.o

$ cc a.o libpes.a libpes.a
lto1: fatal error: multiple prevailing defs for ‘wrl2’
compilation terminated.
lto-wrapper: fatal error: cc returned 1 exit status
compilation terminated.
/usr/lib64/gcc/x86_64-suse-linux/7/../../../../x86_64-suse-linux/bin/ld: error:
lto-wrapper failed
collect2: error: ld returned 1 exit status

Where .res file looks as follows:
$ cat libpes.res
3
a.o 2
190 c40a787b82fa11ab PREVAILING_DEF main
194 c40a787b82fa11ab PREVAILING_DEF_IRONLY wrl
address@hidden 2
188 8e139599392dae30 PREVAILING_DEF_IRONLY wrl2
190 8e139599392dae30 RESOLVED_IR wrl
address@hidden 2
188 8e139599392dae30 PREVAILING_DEF_IRONLY wrl2
190 8e139599392dae30 RESOLVED_IR wrl

While gold is fine, having following resolution file:

$ cat libpes.res
1
a.o 2
190 c40a787b82fa11ab PREVAILING_DEF main
194 c40a787b82fa11ab PREVAILING_DEF_IRONLY wrl

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