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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Clang doesn't pass -march to external linker"
href="http://llvm.org/bugs/show_bug.cgi?id=20019">20019</a>
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<th>Summary</th>
<td>Clang doesn't pass -march to external linker
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>trunk
</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
</td>
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<th>Component</th>
<td>-New Bugs
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>charlebm@gmail.com
</td>
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<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
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<th>Classification</th>
<td>Unclassified
</td>
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<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=12651" name="attach_12651" title="log file showing clang and gcc compilations of aarch64 code with -march">attachment 12651</a> <a href="attachment.cgi?id=12651&action=edit" title="log file showing clang and gcc compilations of aarch64 code with -march">[details]</a></span>
log file showing clang and gcc compilations of aarch64 code with -march
Seems to be the same problem as <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - clang doesn't pass target CPU to linker command for LTO"
href="show_bug.cgi?id=14697">Bug 14697</a> but it is happening again on trunk.
The -march option is not passed to the linker if -no-integrated-as is used, and
when ARMv8 crypto extensions are used, the assember complains that the
processor does not support the crypto instructions.
The linker can be given the -march option using -Wa,-march=foo but gcc passes
the -march option down without needing -Wa.</pre>
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