https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87668
Bug ID: 87668
Summary: [OpenMP] Complains about loop bound variable not being
shared, even though unused in the loop
Product: gcc
Version: 8.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: lebedev.ri at gmail dot com
Target Milestone: ---
https://godbolt.org/z/05Zgdd
#include <vector>
struct b {};
void c() {
std::vector<b> d;
#ifdef _OPENMP
#pragma omp parallel default(none)
#pragma omp for
#endif
for (auto f = d.begin(); f < d.end(); ++f)
;
}
#ifndef _OPENMP
Yes, there is OMP.
#endif
GCC output:
<source>: In function 'void c()':
<source>:9:25: error: 'd' not specified in enclosing 'parallel'
for (auto f = d.begin(); f < d.end(); ++f)
^
<source>:6:9: error: enclosing 'parallel'
#pragma omp parallel default(none)
^~~
Compiler returned: 1
Clang is perfectly happy with that code.
Since the 'd' isn't actually used in the parallel loop body,
but only in the loop bound checking, shouldn't gcc not complain about this,
too?
