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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - -Wunused-but-set-parameter diagnostic warns about parameter += 1 but not parameter++"
href="https://bugs.llvm.org/show_bug.cgi?id=52274">52274</a>
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<th>Summary</th>
<td>-Wunused-but-set-parameter diagnostic warns about parameter += 1 but not parameter++
</td>
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<th>Product</th>
<td>clang
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>All
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>-New Bugs
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>cpeterson@mozilla.com
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<th>CC</th>
<td>htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org, neeilans@live.com, richard-llvm@metafoo.co.uk
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<p>
<div>
<pre>When compiled with `clang++ -Wunused-but-set-parameter test.cpp`, the following
test program reports the following warnings:
test.cpp:8:14: warning: parameter 'a' set but not used
[-Wunused-but-set-parameter]
void foo(int a, int b, int c) {
^
test.cpp:8:21: warning: parameter 'b' set but not used
[-Wunused-but-set-parameter]
void foo(int a, int b, int c) {
void foo(int a, int b, int c) {
a = 1; // PASS: expect warning, got warning
b += 1; // PASS: expect warning, got warning
c++; // FAIL? expect warning because c++ result unused, got no warning
}
If `b += 1` is considered "setting but not using" b, then shouldn't `c++` also
be considered "setting but not using" parameter c?
I am using Homebrew clang version 13.0.0 on macOS 11.6.</pre>
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