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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - clang 3.5.2 on cygwin generates inconsistent argc value on -O1 and higher"
href="https://llvm.org/bugs/show_bug.cgi?id=25045">25045</a>
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<th>Summary</th>
<td>clang 3.5.2 on cygwin generates inconsistent argc value on -O1 and higher
</td>
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<th>Product</th>
<td>new-bugs
</td>
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<th>Version</th>
<td>3.5
</td>
</tr>
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<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>
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<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>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>omoik4ne@yahoo.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=14996" name="attach_14996" title="Trivial C code to print value of argc">attachment 14996</a> <a href="attachment.cgi?id=14996&action=edit" title="Trivial C code to print value of argc">[details]</a></span>
Trivial C code to print value of argc
On cygwin, when compiling C or C++ code with optimizations enabled using either
clang or clang++, the value of argc passed to main() is inconsistent.
cat <<EOT > a.c
#include<stdio.h>
int main(int argc, char *argv[])
{
printf("%d\n", argc);
return 0;
}
EOT
% clang -O0 a.c -o a.exe && ./a.exe
1
% clang -O1 a.c -o a.exe && ./a.exe
0
A value of "0" is not technically wrong (according to 5.1.2.2.1 in ISO/IEC
9899), but I can't find another compiler that does this. If clang were going
to do it, it should at least be consistent between -O0 and -O1.</pre>
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