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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - -fvisibility-inlines-hidden marks static local variables as hidden when it shouldn't"
href="https://bugs.llvm.org/show_bug.cgi?id=37595">37595</a>
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<th>Summary</th>
<td>-fvisibility-inlines-hidden marks static local variables as hidden when it shouldn't
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<th>Product</th>
<td>clang
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<th>Version</th>
<td>3.2
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<th>Hardware</th>
<td>PC
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<th>OS</th>
<td>Linux
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<th>Status</th>
<td>NEW
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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>C++
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>redbeard0531@gmail.com
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<th>CC</th>
<td>dgregor@apple.com, llvm-bugs@lists.llvm.org
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<p>
<div>
<pre>At the very least this is a scary undocumented difference from that flag's
meaning under gcc. Quoting the gcc man page for that flag (emphasis mine): The
behavior of this switch is not quite the same as marking the methods as hidden
directly, because ***it does not affect static variables local to the
function*** or cause the compiler to deduce that the function is defined in
only one shared object.
<a href="https://clang.llvm.org/docs/ClangCommandLineReference.html#cmdoption-clang-fvisibility-inlines-hidden">https://clang.llvm.org/docs/ClangCommandLineReference.html#cmdoption-clang-fvisibility-inlines-hidden</a>
only says "Give inline C++ member functions default visibility by default"
which doesn't seem to accurately describe the behavior.
Here is a simple example that shows the issue: <a href="https://godbolt.org/g/63FiwD">https://godbolt.org/g/63FiwD</a>
inline int* test() {
static int staticVar;
return &staticVar;
}
auto force = test();
The problematic line is in the generated ASM is ".hidden test()::staticVar".
That is only generated with clang with -fvisibility-inlines-hidden. gcc does
not add that line to the output. I walked back the versions on godbolt and it
looks like this was introduced between 3.1 and 3.2.</pre>
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