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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Wmissing-variable-declarations for variable templates with auto deduction"
href="https://bugs.llvm.org/show_bug.cgi?id=42042">42042</a>
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<th>Summary</th>
<td>Wmissing-variable-declarations for variable templates with auto deduction
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
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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
</td>
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<th>Component</th>
<td>Frontend
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>mark.sonnentag@gmx.de
</td>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org, neeilans@live.com, richard-llvm@metafoo.co.uk
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<pre>Hi,
Clang reports missing-variable-declarations for variable templates if the type
is auto deduced, whereas no warning is reported if the type is specified:
/////////////////////////////////////////////////////////
// no warning:
template<typename T>
constexpr bool foo = T{};
// warning: no previous extern declaration for non-static variable
// auto_foo<bool>
template<typename T>
constexpr auto auto_foo = T{};
int main(){
foo<bool>;
auto_foo<bool>;
}
////////////////////////////////////////////////////////
Apparently Clang reported the same warning for variable templates with specific
types before (<a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - -Wmissing-variable-declarations warnings trigger on inline variables and variable temples"
href="show_bug.cgi?id=35862">bug 35862</a>).</pre>
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