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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Please improve -Wuninitialized warnings for OpenMP programs"
href="https://bugs.llvm.org/show_bug.cgi?id=42392">42392</a>
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<th>Summary</th>
<td>Please improve -Wuninitialized warnings for OpenMP programs
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>C
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>vyacheslav.p.zakharin@intel.com
</td>
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<th>CC</th>
<td>blitzrakete@gmail.com, dgregor@apple.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
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<pre>The code below compiles silently with "-fopenmp -fopenmp-targets=x86_64". W/o
-fopenmp the errors become obvious:
warn.c:5:5: warning: variable 'r' is uninitialized when used here
[-Wuninitialized]
warn.c:14:5: warning: variable 'r' is uninitialized when used here
[-Wuninitialized]
warn.c:21:12: warning: variable 'r' is uninitialized when used here
[-Wuninitialized]
Can this be improved?
-- code --
int reduction(int *input) {
int i, r;
#pragma omp target parallel for map(to: input) reduction(+: r)
for (i = 0; i < 100; ++i)
r += input[i];
return r;
}
int linear() {
int i, r;
#pragma omp target parallel for linear(r)
for (i = 0; i < 100; ++i)
r += 1;
return r;
}
void firstprivate(int *input) {
int r;
#pragma omp target firstprivate(r) map(tofrom: input[0:1])
*input = r;
}
-- code --</pre>
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