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<base href="https://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Regression(281673): libc++ leaks always-visible symbols into programs"
href="https://llvm.org/bugs/show_bug.cgi?id=30642">30642</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Regression(281673): libc++ leaks always-visible symbols into programs
</td>
</tr>
<tr>
<th>Product</th>
<td>libc++
</td>
</tr>
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<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>All Bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>nicolasweber@gmx.de
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org, mclow.lists@gmail.com
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>thakis-macpro:llvm-build thakis$ cat test.cc
#include <string.h>
#include <string>
int main(int argc, char* argv[]) {
std::string b(argv[0], strlen(argv[0]));
b.insert(b.end(), argv[1], argv[1] + strlen(argv[1]));
}
$ bin/clang++ -fvisibility=hidden -fvisibility-inlines-hidden -std=c++11 -c
test.cc -isysroot $(xcrun -show-sdk-path) && nm -m test.o | grep insert
0000000000001dc0 (__TEXT,__text) weak external
__ZNSt3__112basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEE6insertIPKcEENS_9enable_ifIXaasr21__is_forward_iteratorIT_EE5valuesr38__libcpp_string_gets_noexcept_iteratorISA_EE5valueENS_11__wrap_iterIPcEEE4typeENSB_IS8_EESA_SA_
00000000000007c0 (__TEXT,__text) weak external
__ZNSt3__112basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEE6insertIPcEENS_9enable_ifIXaasr21__is_forward_iteratorIT_EE5valuesr38__libcpp_string_gets_noexcept_iteratorIS9_EE5valueENS_11__wrap_iterIS7_EEE4typeENSA_IPKcEES9_S9_
Prior to r281673, these used to be "weak private external" (note private). This
is a problem since these functions will leak from programs that try to control
which functions they export.
(Condensed from the longer report at
<a href="https://bugs.chromium.org/p/chromium/issues/detail?id=653337#c16">https://bugs.chromium.org/p/chromium/issues/detail?id=653337#c16</a>)</pre>
</div>
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