https://llvm.org/bugs/show_bug.cgi?id=26749
Bug ID: 26749
Summary: Incorrect typeinfo symbol visibility when using C++
STL containers
Product: new-bugs
Version: 3.7
Hardware: PC
OS: MacOS X
Status: NEW
Severity: normal
Priority: P
Component: new bugs
Assignee: unassignedb...@nondot.org
Reporter: jeffrey.dicleme...@gmail.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
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.
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