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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Clang-tidy: expression with calls to a non-pure function is considered as always-true"
href="https://bugs.llvm.org/show_bug.cgi?id=36505">36505</a>
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<th>Summary</th>
<td>Clang-tidy: expression with calls to a non-pure function is considered as always-true
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>5.0
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Windows NT
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Static Analyzer
</td>
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<th>Assignee</th>
<td>dcoughlin@apple.com
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<th>Reporter</th>
<td>pavel.kryukov@phystech.edu
</td>
</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
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<pre>Created <span class=""><a href="attachment.cgi?id=19951" name="attach_19951" title="Example of always-true false positive with calls to a non-pure function">attachment 19951</a> <a href="attachment.cgi?id=19951&action=edit" title="Example of always-true false positive with calls to a non-pure function">[details]</a></span>
Example of always-true false positive with calls to a non-pure function
Clang-Tidy produces a false positive warning about always-true expression
(misc-redundant-expression check) if expression contains consequent calls to a
non-pure function which have different return values:
$> clang-tidy -checks='*' ldfile.c -- -Wall
15 warnings generated.
./ldfile.c:11:32: warning: logical expression is always true
[misc-redundant-expression]
if ((token = yylex()) != 1 || (token = yylex()) != 2) {
^
Suppressed 14 warnings (14 in non-user code).
$> clang ldfile.c -Wall -Wextra && ./a.out
false
The code is taken from GNU Binutils (/ld/ldfile.c) source file.</pre>
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