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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 - OpenMP compile error for lastprivate array member if also firstprivate"
href="https://bugs.llvm.org/show_bug.cgi?id=47606">47606</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>OpenMP compile error for lastprivate array member if also firstprivate
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>All
</td>
</tr>
<tr>
<th>OS</th>
<td>All
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>OpenMP
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>michael.p.rice@intel.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>If an array member is used in both firstprivate and lastprivate clauses an
error will occur:
<source>:21:56: error: array type 'char [4]' is not assignable
#pragma omp parallel for firstprivate(y) lastprivate(y)
^
But no problem if firstprivate is not used.
#include <stdio.h>
int fails;
struct my_struct {
char y[4];
void work();
void init() { for (int i=0;i<4;++i) y[i] = i; }
void check() { if (y[3]!=42) fails++; }
my_struct() {}
};
void my_struct::work() {
init();
#pragma omp parallel for lastprivate(y)
for (int i=0;i<4;++i) {
y[i] = 42;
}
check();
init();
#pragma omp parallel for firstprivate(y) lastprivate(y)
for (int i=0;i<4;++i) {
y[i] = 42;
}
check();
}
int main()
{
my_struct s;
s.work();
if (fails) printf("failed\n");
else printf("passed\n");
return fails;
}
<a href="https://godbolt.org/z/6E9Po5">https://godbolt.org/z/6E9Po5</a></pre>
</div>
</p>
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