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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - bootstrap failure using libc++abi on Linux -- libc++ does not re-export its symbols"
href="http://llvm.org/bugs/show_bug.cgi?id=22731">22731</a>
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<th>Summary</th>
<td>bootstrap failure using libc++abi on Linux -- libc++ does not re-export its symbols
</td>
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<th>Product</th>
<td>Build scripts
</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>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>cmake
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>richard-llvm@metafoo.co.uk
</td>
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<th>CC</th>
<td>eric@efcs.ca, llvmbugs@cs.uiuc.edu, mclow.lists@gmail.com
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<th>Classification</th>
<td>Unclassified
</td>
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<p>
<div>
<pre>See:
<a href="http://lab.llvm.org:8011/builders/clang-x86_64-linux-selfhost-modules/builds/2/steps/compile/logs/stdio">http://lab.llvm.org:8011/builders/clang-x86_64-linux-selfhost-modules/builds/2/steps/compile/logs/stdio</a>
This build is produced by doing the following on a Debian Linux 7.7 system:
- checking out llvm + clang + libc++ + libc++abi
- configuring with cmake
- building and installing them
- reconfiguring with cmake, using the just-built components
- rebuilding
Apparently we failed to link libc++abi into libLTO.so. Our build system is
passing "-z defs" to the linker when linking this library, which results in the
error. Clang passes '-lc++' but not '-lc++abi' to this link, which is
appropriate because the clang driver has no idea which C++ ABI library is in
use.
On Apple systems, libc++ explicitly re-exports the symbols from libc++abi. We
don't seem to have anything comparable set up for Linux; we presumably should.</pre>
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