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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Please ad the -Wno-pmf-conversions gcc extension"
href="https://bugs.llvm.org/show_bug.cgi?id=45320">45320</a>
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<th>Summary</th>
<td>Please ad the -Wno-pmf-conversions gcc extension
</td>
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<th>Product</th>
<td>clang
</td>
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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>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
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<th>Component</th>
<td>C++
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>rafael@espindo.la
</td>
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<th>CC</th>
<td>blitzrakete@gmail.com, dgregor@apple.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
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<p>
<div>
<pre>With -Wno-pmf-conversions gcc compiles
struct foo {
virtual void func() = 0;
};
void* bar(foo* x) {
void (foo::*f)() = &foo::func;
return (void*)(x->*f);
}
Into
movq (%rdi), %rax
movq (%rax), %rax
ret
That is, it extracts the pointer to the virtual function. This can be
convenient for debugging tools. In seastar we would like to use it to print the
address of a particular function in scheduled tasks. The advantaged of having
the address of the function instead of the task is that it can be mapped to a
location in the source code.</pre>
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