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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 - clang++ throws errors when the redefinition struct in user-defined reduction in CPP file"
href="https://bugs.llvm.org/show_bug.cgi?id=46357">46357</a>
</td>
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<th>Summary</th>
<td>clang++ throws errors when the redefinition struct in user-defined reduction in CPP file
</td>
</tr>
<tr>
<th>Product</th>
<td>OpenMP
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
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<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>
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<th>Component</th>
<td>Clang Compiler Support
</td>
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<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>yangzh.fnst@cn.fujitsu.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
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<pre>Hi,
This code throws errors when I use it in CPP file with clang++. In this code,
struct point which used in declare reduction has been defined. I think it
should be ok in CPP.
Example udr.1.c
This code comes from
<a href="https://www.openmp.org/wp-content/uploads/openmp-examples-5.0.0.pdf">https://www.openmp.org/wp-content/uploads/openmp-examples-5.0.0.pdf</a>
#include <stdio.h>
#include <limits.h>
struct point {
int x;
int y;
};
void minproc ( struct point *out, struct point *in )
{
if ( in->x < out->x ) out->x = in->x;
if ( in->y < out->y ) out->y = in->y;
}
void maxproc ( struct point *out, struct point *in )
{
if ( in->x > out->x ) out->x = in->x;
if ( in->y > out->y ) out->y = in->y;
}
#pragma omp declare reduction(min : struct point : \
minproc(&omp_out, &omp_in)) \
initializer( omp_priv = { INT_MAX, INT_MAX } )
#pragma omp declare reduction(max : struct point : \
maxproc(&omp_out, &omp_in)) \
initializer( omp_priv = { 0, 0 } )
void find_enclosing_rectangle ( int n, struct point points[] )
{
struct point minp = { INT_MAX, INT_MAX }, maxp = {0,0};
int i;
#pragma omp parallel for reduction(min:minp) reduction(max:maxp)
for ( i = 0; i < n; i++ ) {
minproc(&minp, &points[i]);
maxproc(&maxp, &points[i]);
}
printf("min = (%d, %d)\n", minp.x, minp.y);
printf("max = (%d, %d)\n", maxp.x, maxp.y);
}
command:
clang++ -fopenmp -S Example_udr.1.cpp</pre>
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