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<base href="http://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Flag -Wincompatible-pointer-types-discards-qualifiers does not warn conversion from const char* to char*"
href="http://llvm.org/bugs/show_bug.cgi?id=18528">18528</a>
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<tr>
<th>Summary</th>
<td>Flag -Wincompatible-pointer-types-discards-qualifiers does not warn conversion from const char* to char*
</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>
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<th>OS</th>
<td>Windows NT
</td>
</tr>
<tr>
<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>Frontend
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>chengniansun@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Clang warns the small program "unwarned-const-qualifier-removal.c" that the
conversion from const char[5] to char* is not right. And it shows that the
warning is emitted by [-Wincompatible-pointer-types-discards-qualifiers].
However when I try "clang -Wincompatible-pointer-types-discards-qualifiers", no
warning is emitted.
Please refer to the following instructions to reproduce the problem.
$ clang-trunk -Wincompatible-pointer-types-discards-qualifiers
unwarned-const-qualifier-removal.c
$ clang-trunk -Weverything unwarned-const-qualifier-removal.c
unwarned-const-qualifier-removal.c:4:8: warning: initializing 'char *' with an
expression of type 'const char [5]' discards
qualifiers [-Wincompatible-pointer-types-discards-qualifiers]
char* s = "test";
^ ~~~~~~
1 warning generated.
$ cat unwarned-const-qualifier-removal.c
#include <stdio.h>
int main() {
char* s = "test";
s[0] = 'a';
printf("%s\n", s);
return 0;
}
$ clang-trunk --version
clang version 3.5 (trunk 198918)
Target: x86_64-unknown-linux-gnu
Thread model: posix</pre>
</div>
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