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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - clang 290137 hangs/crashes with -std=cxx-1z"
href="https://llvm.org/bugs/show_bug.cgi?id=31432">31432</a>
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<tr>
<th>Summary</th>
<td>clang 290137 hangs/crashes with -std=cxx-1z
</td>
</tr>
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<th>Product</th>
<td>new-bugs
</td>
</tr>
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<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Windows NT
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>new bugs
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>yaron.keren@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>this hangs:
$~/bug/1522$ cat file1.cpp
void mbstate_t() { __builtin_constant_p(0); }
namespace std {
using ::mbstate_t;
}
namespace {
extern "C" void vfprintf();
}
$ clang++ -c -std=c++1z file1.cpp
file1.cpp:1:20: warning: ignoring return value of function declared with const
attribute [-Wunused-value]
void mbstate_t() { __builtin_constant_p(0); }
^~~~~~~~~~~~~~~~~~~~ ~
and this crashes:
$ cat file1.cpp
void mbstate_t() { __builtin_constant_p(0); }
namespace {
extern "C" void vfprintf();
}
$ clang++ -c -std=c++1z file1.cpp
file1.cpp:1:20: warning: ignoring return value of function declared with const
attribute [-Wunused-value]
void mbstate_t() { __builtin_constant_p(0); }
^~~~~~~~~~~~~~~~~~~~ ~
problem only when std==c++1z, was reduced from real library code.</pre>
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