http://llvm.org/bugs/show_bug.cgi?id=7353
Summary: Undefined symbol '__ZNSbIcED1Ev' when using extern
templates and -fvisibility-hidden
Product: clang
Version: trunk
Platform: Macintosh
OS/Version: All
Status: NEW
Severity: normal
Priority: P
Component: C++
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected], [email protected]
Reduced testcase (this was a 500k file, hooray for delta):
$ cat file.pp.mm
namespace std {
template<typename T> class basic_string {
public:
~basic_string() {}
};
extern template class basic_string<char>;
}
std::basic_string<char> kEmptyString;
$ /Users/thakis/src/llvm/Release/bin/clang++ -fvisibility=hidden -c file.pp.mm
fatal error: error in backend: symbol '__ZNSbIcED1Ev' can not be undefined in a
subtraction expression
The message is written by llvm/lib/MC/MachObjectWriter.cpp
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