https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84991
Bug ID: 84991
Summary: [openacc] Misleading error message for function static
var in routine
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: middle-end
Assignee: unassigned at gcc dot gnu.org
Reporter: vries at gcc dot gnu.org
Target Milestone: ---
The openacc spec tells us at 2.15.1. Routine Directive:
...
In C and C++, function static variables are not supported in functions to which
a routine directive applies.
...
When compiling such an example with -fopenacc:
...
#include <stdio.h>
#pragma acc routine seq
static int __attribute__((noinline)) foo (int n)
{
static const int test[] = {1,2,3,4};
return test[n];
}
int
main (void)
{
int n[1];
n[0] = 3;
#pragma acc parallel copy(n)
{
n[0] = foo (n[0]);
}
printf ("n: %d\n", n[0]);
return 0;
}
...
we get
...
static.c: In function 'foo':
static.c:6:20: error: 'test' requires a 'declare' directive for use in a
'routine' function
static.c:6:20: error: 'test' requires a 'declare' directive for use in a
'routine' function
...
The error message is somewhat misleading. Adding a declare directive here does
not change the example into valid openacc.
