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<base href="https://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - clang doesn't warn when integer is tried against literal that is too big"
href="https://llvm.org/bugs/show_bug.cgi?id=23211">23211</a>
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<th>Summary</th>
<td>clang doesn't warn when integer is tried against literal that is too big
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>3.4
</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>
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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>
</tr>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>nchambers@dtscode.io
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</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=14195" name="attach_14195" title="Testcase">attachment 14195</a> <a href="attachment.cgi?id=14195&action=edit" title="Testcase">[details]</a></span>
Testcase
Using the attached testcase, clang doesn't output any warnings when comparing
an unsigned int against a literal that is too big in size. Compile Flags:
dtscode@dtscode-laptop:~/Desktop$ clang unsigned-test.c -o unsigned-test -Wall
-Wextra -pedantic -Wtype-limits
dtscode@dtscode-laptop:~/Desktop$
using similar flags in gcc (with the addition of -std=c99 since I'm a few
releases behind):
dtscode@dtscode-laptop:~/Desktop$ gcc -std=c99 unsigned-test.c -o unsigned-test
-Wall -Wextra -pedantic
unsigned-test.c: In function ‘main’:
unsigned-test.c:5:3: warning: comparison is always true due to limited range of
data type [-Wtype-limits]
for (unsigned int i=0; i<=4294967295; i++) sum++;
^
dtscode@dtscode-laptop:~/Desktop$</pre>
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