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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Libcall simplification in -ffreestanding"
href="http://llvm.org/bugs/show_bug.cgi?id=20044">20044</a>
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<th>Summary</th>
<td>Libcall simplification in -ffreestanding
</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>normal
</td>
</tr>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>-New Bugs
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>llvm-bugs@quasiparticle.net
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</tr>
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<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
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<th>Classification</th>
<td>Unclassified
</td>
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<p>
<div>
<pre>Currently, clang disables libcall simplification entirely when called with
-ffreestanding, as is expected. clang also disables libcall simplification if
-fbuiltin is also given on the command line, contrary to what gcc does.
I fully agree with the default behaviour (-ffreestanding implies -fno-builtin),
but I also want to disable it in some circumstances. In freestanding mode,
folding memcpy and friends instead of generating calls is just as useful as in
hosted mode (except in the definition of those, of course). Allowing -fbuiltin
to enable libcall simplification on freestanding would be one way to do that,
or a new function attribute (I'd prefer that), or maybe something else
entirely.</pre>
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</p>
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