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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Regression(r365860) New fomit-frame-pointer / momit-leaf-frame-pointer handling leads to unfriendly diagnostics"
href="https://bugs.llvm.org/show_bug.cgi?id=42966">42966</a>
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<th>Summary</th>
<td>Regression(r365860) New fomit-frame-pointer / momit-leaf-frame-pointer handling leads to unfriendly diagnostics
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<th>Product</th>
<td>clang
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<th>Version</th>
<td>trunk
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<th>Hardware</th>
<td>PC
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<th>OS</th>
<td>All
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
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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>nicolasweber@gmx.de
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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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<pre>Say you want frame pointers but no leaf frame pointers (because you want to
unwind, but including leaf frame pointers makes llvm run out of registers -- cf
PR15798).
So you pass -fno-omit-frame-pointer -momit-leaf-frame-pointer to all compiles.
Some specific translation unit wants to omit frame pointers for some reason
though, so it tacks on fomit-frame-pointer. Previously that worked fine.
Now it results in
clang: warning: argument unused during compilation: '-momit-leaf-frame-pointer'
[-Wunused-command-line-argument]
That's true, but it's also not helpful. There's no good way in practice to fix
this warning if it arises in a situation like this.
We should probably manually claim the momit flags if the fomit flags are seen.</pre>
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