[Bug sanitizer/59122] New: libsanitizer merge from upstream r191666 causes duplicate symbol errors

["bergner at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59122

            Bug ID: 59122
           Summary: libsanitizer merge from upstream r191666 causes
                    duplicate symbol errors
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: sanitizer
          Assignee: unassigned at gcc dot gnu.org
          Reporter: bergner at gcc dot gnu.org
                CC: dodji at gcc dot gnu.org, dvyukov at gcc dot gnu.org,
                    jakub at gcc dot gnu.org, kcc at gcc dot gnu.org

After the bootstrap issue from PR59009 was fixed, I'm now seeing other fallout
from the upstream libsanitizer merge.

[bergner@igoo asan]$ cat foo.i 
extern int printf(const char *format, ...);
void
Child (void)
{
  char x[32] = {0};
  printf ("Child:  \n", x);
}

int
main (void)
{
  return 0;
}
[bergner@igoo asan]$ /home/bergner/gcc/build/gcc-fsf-mainline-asan/gcc/xgcc
-B/home/bergner/gcc/build/gcc-fsf-mainline-asan/gcc/ -fsanitize=address -O1
-m32 -c foo.i 
/tmp/ccadY6mS.s: Assembler messages:
/tmp/ccadY6mS.s:136: Error: symbol `.LASANPC0' is already defined

The duplicate symbol is coming from:

void
asan_function_start (void)
{
  section *fnsec = function_section (current_function_decl);
  switch_to_section (fnsec);
  ASM_OUTPUT_DEBUG_LABEL (asm_out_file, "LASANPC",
                         current_function_funcdef_no);
}

It seems current_function_funcdef_no isn't being incremented when we expected
it to be.