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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - GCC produces ABI-incompatible libc++ dylibs"
href="https://llvm.org/bugs/show_bug.cgi?id=30391">30391</a>
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<th>Summary</th>
<td>GCC produces ABI-incompatible libc++ dylibs
</td>
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<th>Product</th>
<td>libc++
</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>Windows NT
</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>All Bugs
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
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<th>Reporter</th>
<td>eric@efcs.ca
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org, mclow.lists@gmail.com
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<th>Classification</th>
<td>Unclassified
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</tr></table>
<p>
<div>
<pre>GCC handles _LIBCPP_INLINE_VISIBILITY differently than Clang. In particular
when the attributes are applied to symbols which are externally instantiated.
For example in the reproducer below Clang will emit both 'foo' and 'bar' with
default visibility while GCC only emits a non-hidden 'foo'.
// RUN: g++ -std=c++11 -shared -O3 test.cpp && sym_extract.py a.out
// RUN: clang++ -std=c++11 -shared -O3 test.cpp && sym_extract.py a.out
template <class T>
struct Foo {
void foo();
void bar();
};
template <class T>
void Foo<T>::foo() {}
template <class T>
inline __attribute__((visibility("hidden"), always_inline))
void Foo<T>::bar() {}
template struct Foo<int>;
One way to fix this would be to add _LIBCPP_EXTERN_TEMPLATE_INLINE_VISIBILITY
which is defined as __attribute__((visibility("default"), always_inline)).</pre>
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