[Bug c/24455] New: [gomp] Trouble with threadprivate and extern

[reichelt at gcc dot gnu dot org]

Compiling the following project with -fopenmp doesn't work:

file.h:
=======================================
extern int i;
#pragma omp threadprivate (i)
=======================================

file1.c:
=======================================
#include "file.h"

int main()
{
    return i;
}
=======================================

file2.c:
=======================================
#include "file.h"
int i;
=======================================

For file2.c I get the following error message:

  file2.c:2: error: non-thread-local declaration of 'i' follows thread-local
declaration
  file.h:1: error: previous declaration of 'i' was here

Compiling the files as C++ files results in a linker failure:

  /usr/bin/ld: i: TLS reference in /tmp/cceZCG1l.o mismatches non-TLS
definition in /tmp/ccBzZ3av.o section .bss
  /tmp/ccBzZ3av.o: could not read symbols: Bad value
  collect2: ld returned 1 exit status

I'd expect that i is threadprivate in file1.c and file2.c.
Am I misreading the OpenMP spec or is this a bug in the frontends?


-- 
           Summary: [gomp] Trouble with threadprivate and extern
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Keywords: wrong-code, rejects-valid, openmp
          Severity: normal
          Priority: P2
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: reichelt at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24455