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<head>
<base href="https://llvm.org/bugs/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Incorrect typeinfo symbol visibility when using C++ STL containers"
href="https://llvm.org/bugs/show_bug.cgi?id=26749">26749</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Incorrect typeinfo symbol visibility when using C++ STL containers
</td>
</tr>
<tr>
<th>Product</th>
<td>new-bugs
</td>
</tr>
<tr>
<th>Version</th>
<td>3.7
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>MacOS X
</td>
</tr>
<tr>
<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>new bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>jeffrey.diclemente@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Clang version used:
clang version 3.7.0 (tags/RELEASE_370/final)
Target: x86_64-apple-darwin14.5.0
Thread model: posix
Mac OS X version: 10.10.5 (Yosemite)
Reproducible test case:
//test_typeinfo_symbols.cpp
#include <typeinfo>
#include <map>
#include <string>
int main(int, char**)
{
std::map<std::string, int>::const_iterator ci;
const std::type_info& t = typeid(std::map<std::string, std::string>);
(void)t;
return 0;
}
Reproduction steps:
build test_typeinfo_symbols.cpp using:
clang -fvisibility=hidden -isysroot
/Applications/Xcode6.4.0.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.10.sdk
-stdlib=libc++ -c test_typeinfo_symbols.cpp
run nm against the .o:
nm -om test_typeinfo_symobls.o | c++filt
nm should output the following:
test_typeinfo_symbols.o: 00000000000000c8 (__DATA,__datacoal_nt) weak private
external typeinfo for std::__1::map<std::__1::basic_string<char,
std::__1::char_traits<char>, std::__1::allocator<char> >,
std::__1::basic_string<char, std::__1::char_traits<char>,
std::__1::allocator<char> >, std::__1::less<std::__1::basic_string<char,
std::__1::char_traits<char>, std::__1::allocator<char> > >,
std::__1::allocator<std::__1::pair<std::__1::basic_string<char,
std::__1::char_traits<char>, std::__1::allocator<char> > const,
std::__1::basic_string<char, std::__1::char_traits<char>,
std::__1::allocator<char> > > > >
test_typeinfo_symbols.o: 0000000000000050 (__TEXT,__const_coal) weak private
external typeinfo name for std::__1::map<std::__1::basic_string<char,
std::__1::char_traits<char>, std::__1::allocator<char> >,
std::__1::basic_string<char, std::__1::char_traits<char>,
std::__1::allocator<char> >, std::__1::less<std::__1::basic_string<char,
std::__1::char_traits<char>, std::__1::allocator<char> > >,
std::__1::allocator<std::__1::pair<std::__1::basic_string<char,
std::__1::char_traits<char>, std::__1::allocator<char> > const,
std::__1::basic_string<char, std::__1::char_traits<char>,
std::__1::allocator<char> > > > >
test_typeinfo_symbols.o: (undefined) external vtable for
__cxxabiv1::__class_type_info
test_typeinfo_symbols.o: 0000000000000000 (__TEXT,__text) private external
_main
Now modify test_typeinfo_symbols.cpp to:
//test_typeinfo_symbols.cpp
#include <typeinfo>
#include <map>
#include <string>
int main(int, char**)
{
const std::type_info& t = typeid(std::map<std::string, std::string>);
(void)t;
std::map<std::string, int>::const_iterator ci;
return 0;
}
build test_typeinfo_symbols.cpp using:
clang -fvisibility=hidden -isysroot
/Applications/Xcode6.4.0.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.10.sdk
-stdlib=libc++ -c test_typeinfo_symbols.cpp
run nm against the .o:
nm -om test_typeinfo_symobls.o | c++filt
nm should output the following:
test_typeinfo_symbols.o: 00000000000000c8 (__DATA,__datacoal_nt) weak external
typeinfo for std::__1::map<std::__1::basic_string<char,
std::__1::char_traits<char>, std::__1::allocator<char> >,
std::__1::basic_string<char, std::__1::char_traits<char>,
std::__1::allocator<char> >, std::__1::less<std::__1::basic_string<char,
std::__1::char_traits<char>, std::__1::allocator<char> > >,
std::__1::allocator<std::__1::pair<std::__1::basic_string<char,
std::__1::char_traits<char>, std::__1::allocator<char> > const,
std::__1::basic_string<char, std::__1::char_traits<char>,
std::__1::allocator<char> > > > >
test_typeinfo_symbols.o: 0000000000000050 (__TEXT,__const_coal) weak external
typeinfo name for std::__1::map<std::__1::basic_string<char,
std::__1::char_traits<char>, std::__1::allocator<char> >,
std::__1::basic_string<char, std::__1::char_traits<char>,
std::__1::allocator<char> >, std::__1::less<std::__1::basic_string<char,
std::__1::char_traits<char>, std::__1::allocator<char> > >,
std::__1::allocator<std::__1::pair<std::__1::basic_string<char,
std::__1::char_traits<char>, std::__1::allocator<char> > const,
std::__1::basic_string<char, std::__1::char_traits<char>,
std::__1::allocator<char> > > > >
test_typeinfo_symbols.o: (undefined) external vtable for
__cxxabiv1::__class_type_info
test_typeinfo_symbols.o: 0000000000000000 (__TEXT,__text) private external
_main
now the typeinfo is weak external, instead of weak private external.
Why does the order in which the std::map<std::string, int>::const_iterator
appears in the source file change the typeinfo symbol visibility of a different
type?
This seems like a bug.</pre>
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