[Bug ld/26267] New: LTO failed to detect multiple definitions

[hjl.tools at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=26267

            Bug ID: 26267
           Summary: LTO failed to detect multiple definitions
           Product: binutils
           Version: 2.35
            Status: NEW
          Severity: normal
          Priority: P2
         Component: ld
          Assignee: unassigned at sourceware dot org
          Reporter: hjl.tools at gmail dot com
                CC: nickc at redhat dot com
  Target Milestone: ---

[hjl@gnu-cfl-2 lto-1]$ cat pr26262a.c
#include <stdio.h>

int counter;
extern void foo (void);
extern void xxx (void);

void
bar (void)
{
}

int
main(void)
{
  bar ();
  foo ();
  xxx ();
  if (counter == 1)
    printf ("PASS\n");
  return 0;
}
[hjl@gnu-cfl-2 lto-1]$ cat pr26262b.c
#include <stdlib.h>

extern int counter;

void
foo (void)
{
  counter++;
}

void
bar (void)
{
  abort ();
}
[hjl@gnu-cfl-2 lto-1]$ cat pr26262c.c
extern void bar (void);
void
xxx (void)
{
  bar ();
}
[hjl@gnu-cfl-2 lto-1]$ make
gcc -O2 -flto   -c -o pr26262a.o pr26262a.c
gcc -O2   -c -o pr26262b.o pr26262b.c
gcc -O2   -c -o pr26262c.o pr26262c.c
gcc  -O2 -o x pr26262a.o pr26262b.o pr26262c.o
./x
make: *** [Makefile:11: all] Aborted (core dumped)
[hjl@gnu-cfl-2 lto-1]$ gcc  -O2 -o x pr26262a.o pr26262b.o pr26262c.o
-fuse-ld=gold
/usr/local/bin/ld.gold: error: pr26262b.o: multiple definition of 'bar'
/usr/local/bin/ld.gold: pr26262a.o: previous definition here
collect2: error: ld returned 1 exit status
[hjl@gnu-cfl-2 lto-1]$

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