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<body><span class="vcard"><a class="email" href="mailto:ldionne@apple.com" title="Louis Dionne <ldionne@apple.com>"> <span class="fn">Louis Dionne</span></a>
</span> changed
<a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - Definition __ZTSPKDu in itanium-base.exp is used for -export_symbol but is really undefined"
href="https://bugs.llvm.org/show_bug.cgi?id=43749">bug 43749</a>
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<th>What</th>
<th>Removed</th>
<th>Added</th>
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<td style="text-align:right;">CC</td>
<td>
</td>
<td>ldionne@apple.com
</td>
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<td style="text-align:right;">Resolution</td>
<td>---
</td>
<td>INVALID
</td>
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<td style="text-align:right;">Status</td>
<td>NEW
</td>
<td>RESOLVED
</td>
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<td style="text-align:right;">Assignee</td>
<td>unassignedbugs@nondot.org
</td>
<td>ldionne@apple.com
</td>
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<b><a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - Definition __ZTSPKDu in itanium-base.exp is used for -export_symbol but is really undefined"
href="https://bugs.llvm.org/show_bug.cgi?id=43749#c2">Comment # 2</a>
on <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - Definition __ZTSPKDu in itanium-base.exp is used for -export_symbol but is really undefined"
href="https://bugs.llvm.org/show_bug.cgi?id=43749">bug 43749</a>
from <span class="vcard"><a class="email" href="mailto:ldionne@apple.com" title="Louis Dionne <ldionne@apple.com>"> <span class="fn">Louis Dionne</span></a>
</span></b>
<pre>What compiler are you using? I'm guessing you're using a fairly old Clang.
The issue is that the compiler emits type information for fundamental types in
libc++abi, and your compiler doesn't know about char8_t yet, so it doesn't emit
the type information for those. libc++abi tries to export these symbols and it
fails to do so, because they haven't been generated in the dylib by the
compiler.
Getting a linker error is quite nice, because otherwise you'd be producing a
libc++abi.dylib that doesn't work properly at runtime (say if you try to use
typeid(char8_t) in your program).
The fix is to use a recent Clang when building libc++ and libc++abi.</pre>
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