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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - With -std=c++11, setjmp and sigsetjmp lose returns_twice attribute"
href="http://llvm.org/bugs/show_bug.cgi?id=19207">19207</a>
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<th>Summary</th>
<td>With -std=c++11, setjmp and sigsetjmp lose returns_twice attribute
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>C++11
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>eugeni.stepanov@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>dgregor@apple.com, llvmbugs@cs.uiuc.edu
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>This results in rare miscompilations and is causing the current failure on
lab.llvm.org:8011/builders/sanitizer-x86_64-linux (android tests). Observed
both on arm-android and x86_64-linux.
$ cat 1.cc
#include <setjmp.h>
void f() {
jmp_buf a;
sigjmp_buf b;
setjmp(a);
sigsetjmp(b, true);
}
# clang++ 1.cc -S -emit-llvm -o -
...
; Function Attrs: nounwind returns_twice
declare i32 @_setjmp(%struct.__jmp_buf_tag*) #1
; Function Attrs: nounwind returns_twice
declare i32 @__sigsetjmp(%struct.__jmp_buf_tag*, i32) #1
...
# clang++ 1.cc -S -emit-llvm -std=c++11 -o -
...
; Function Attrs: nounwind
declare i32 @_setjmp(%struct.__jmp_buf_tag*) #1
; Function Attrs: nounwind
declare i32 @__sigsetjmp(%struct.__jmp_buf_tag*, i32) #1
...</pre>
</div>
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