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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Incompatible behavior and warning for '#pragma GCC diagnostic pop' with no corresponding push"
href="http://llvm.org/bugs/show_bug.cgi?id=22691">22691</a>
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<th>Summary</th>
<td>Incompatible behavior and warning for '#pragma GCC diagnostic pop' with no corresponding push
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>3.4
</td>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
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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
</td>
</tr>
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<th>Reporter</th>
<td>ulfalizer@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>dgregor@apple.com, llvmbugs@cs.uiuc.edu
</td>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre><a href="https://gcc.gnu.org/onlinedocs/gcc/Diagnostic-Pragmas.html">https://gcc.gnu.org/onlinedocs/gcc/Diagnostic-Pragmas.html</a> states that "if a
pop has no matching push, the command-line options are restored". This matches
the actual behavior for GCC (provided you extend it to also mean that defaults
are restored for things not specified on the command-line, which makes sense).
In clang, a pop without a corresponding push generates a warning and does not
seem to restore warnings.
Test case:
void f(void) {
#pragma GCC diagnostic ignored "-Wunused-value"
0;
#pragma GCC diagnostic pop
0;
}
GCC generates a warning for the second '0;'. clang only generates a "warning:
pragma diagnostic pop could not pop, no matching push".</pre>
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