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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Does not complains about loop bound variable not being shared"
href="https://bugs.llvm.org/show_bug.cgi?id=39372">39372</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Does not complains about loop bound variable not being shared
</td>
</tr>
<tr>
<th>Product</th>
<td>OpenMP
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>Clang Compiler Support
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>lebedev.ri@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Originally reported as <a href="https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87668">https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87668</a>
<a href="https://godbolt.org/z/05Zgdd">https://godbolt.org/z/05Zgdd</a>
#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.
Jakub Jelinek 2018-10-21 10:22:10 UTC
GCC is correct here.
Even with the recent 5.0 clarifications, those expressions are to be evaluated
before the worksharing-loop construct, but still inside of the parallel region,
so with default(none) d needs to be specified on the parallel (e.g. shared or
firstprivate).</pre>
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