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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - 'nodiscard' can be applied to function pointers"
href="https://bugs.llvm.org/show_bug.cgi?id=45520">45520</a>
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<th>Summary</th>
<td>'nodiscard' can be applied to function pointers
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>10.0
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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>
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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>C++17
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>tiagomacarios@gmail.com
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<th>CC</th>
<td>blitzrakete@gmail.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
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<p>
<div>
<pre>clang, gcc, and cl disagree on the diagnostics for the code below:
<a href="https://godbolt.org/z/-zaSRh">https://godbolt.org/z/-zaSRh</a>
[[nodiscard]] bool (*f)();
void _(){
f();
}
clang:
<source>:4:3: warning: ignoring return value of function declared with
'nodiscard' attribute [-Wunused-result]
f();
^
1 warning generated.
Compiler returned: 0
gcc:
<source>:1:25: warning: 'nodiscard' attribute can only be applied to functions
or to class or enumeration types [-Wattributes]
1 | [[nodiscard]] bool (*f)();
| ^
Compiler returned: 0
cl:
example.cpp
Compiler returned: 0
Looking at the standard I would think that gcc's behavior is correct?
<a href="http://eel.is/c++draft/dcl.attr.nodiscard#1.sentence-1">http://eel.is/c++draft/dcl.attr.nodiscard#1.sentence-1</a>
"The attribute-token nodiscard may be applied to the declarator-id in a
function declaration or to the declaration of a class or enumeration."</pre>
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