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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Wc++98-compat + CTAD = bogus warning about 'auto' when no 'auto' appears in the code"
href="https://bugs.llvm.org/show_bug.cgi?id=43775">43775</a>
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<th>Summary</th>
<td>Wc++98-compat + CTAD = bogus warning about 'auto' when no 'auto' appears in the code
</td>
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<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>All
</td>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>-New Bugs
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>arthur.j.odwyer@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org, neeilans@live.com, richard-llvm@metafoo.co.uk
</td>
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<p>
<div>
<pre>cat >test.cc <<EOF
// <a href="https://godbolt.org/z/5x5V5v">https://godbolt.org/z/5x5V5v</a>
template<class T> struct S {};
void f() {
S<int> s;
S t = s;
}
EOF
clang++ -std=c++17 -Wc++98-compat test.cc
The codegen is fine, but the first warning issued is both redundant AND
technically incorrect. No 'auto' type specifier exists in this code, so Clang
really shouldn't be warning about any 'auto' type specifier.
===
test.cc:4:5: warning: 'auto' type specifier is incompatible with C++98
[-Wc++98-compat]
S t = s;
^
test.cc:4:5: warning: class template argument deduction is incompatible with
C++ standards before C++17; for compatibility, use explicit type name 'S<int>'
[-Wc++98-c++11-c++14-compat]
S t = s;
^
2 warnings generated.
===</pre>
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