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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - No warning for implicit conversion from an integer expression with integer constants to char"
href="http://llvm.org/bugs/show_bug.cgi?id=18585">18585</a>
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<th>Summary</th>
<td>No warning for implicit conversion from an integer expression with integer constants to char
</td>
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<tr>
<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>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>
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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 does not warn implicit conversions from integer expressions to smaller
types, such as char.
For the following example, Clang should warn the conversion from the expression
"c + 1" of integer type to "char", also for the "c += 1".
$: cat s.c
static char a(char c) {
c = c + 1;
c += 1;
return c;
}
$: clang-trunk -c -Wconversion s.c
$: clang-trunk --version
clang version 3.5 (trunk 199549)
Target: x86_64-unknown-linux-gnu
Thread model: posix
$: gcc-trunk -c -Wconversion s.c
s.c: In function ‘a’:
s.c:2:9: warning: conversion to ‘char’ from ‘int’ may alter its value
[-Wconversion]
c = c + 1;
^
s.c:3:5: warning: conversion to ‘char’ from ‘int’ may alter its value
[-Wconversion]
c += 1;
^</pre>
</div>
</p>
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