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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 - #pragma GCC warning … with -Werror not treated as error"
href="https://bugs.llvm.org/show_bug.cgi?id=36758">36758</a>
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<tr>
<th>Summary</th>
<td>#pragma GCC warning … with -Werror not treated as error
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>6.0
</td>
</tr>
<tr>
<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>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>-New Bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>clang@evan.coeusgroup.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Clang seems to support `#pragma GCC warning …` (see
<<a href="https://gcc.gnu.org/onlinedocs/cpp/Pragmas.html#Pragmas">https://gcc.gnu.org/onlinedocs/cpp/Pragmas.html#Pragmas</a>>), but the messages
are *always* treated as warnings, even when -Werror is provided.
AFAICT `#pragma GCC warning …` is treated as an alias for `#pragma message …`
(the warning which is emitted says it's -W#pragma-messages). It should be
treated more like #warning.
Test case is simple:
$ cat warn.c
#pragma GCC warning "Hello"
$ clang -Werror -c -o warn.o warn.c && echo "I shouldn't be printed"
warn.c:1:13: warning: Hello [-W#pragma-messages]
#pragma GCC warning "Hello"
^
1 warning generated.
I shouldn't be printed
GCC works as expected:
$ gcc -Werror -c -o warn.o warn.c && echo "I shouldn't be printed"
warn.c:1:21: error: Hello [-Werror]
#pragma GCC warning "Hello"
^~~~~~~
cc1: all warnings being treated as errors
As does ICC:
icc -Werror -c -o warn.o warn.c && echo "I shouldn't be printed"
warn.c(1): error #1028: unknown warning specifier
#pragma GCC warning "Hello"
^
compilation aborted for warn.c (code 2)</pre>
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