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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - frame pointer should be omitted for -pg -mfentry"
href="https://bugs.llvm.org/show_bug.cgi?id=44934">44934</a>
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<th>Summary</th>
<td>frame pointer should be omitted for -pg -mfentry
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</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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<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Common Code Generator Code
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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</tr>
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<th>Reporter</th>
<td>ndesaulniers@google.com
</td>
</tr>
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<th>CC</th>
<td>isanbard@gmail.com, llozano@chromium.org, llvm-bugs@lists.llvm.org, srhines@google.com
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<p>
<div>
<pre>// foo.c
void foo(void){}
$ gcc foo.c -O2 -pg -mfentry
foo:
1: call __fentry__
ret
$ clang foo.c -O2 -pg -mfentry
foo: # @foo
# %bb.0:
call __fentry__
push rbp
mov rbp, rsp
pop rbp
ret
Maybe a bug related to `-pg`, because if I explicitly add
`-fomit-frame-pointer` I get an error that its incompatible with `-pg`.
<a href="https://reviews.llvm.org/D28000">https://reviews.llvm.org/D28000</a> seems to insert the __fentry__ call, but
doesn't make any changes during prologue/epilogue insertion.</pre>
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