[LLVMbugs] [Bug 10249] New: Missing functions in string.cpp

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=10249

           Summary: Missing functions in string.cpp
           Product: libc++
           Version: unspecified
          Platform: PC
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: All Bugs
        AssignedTo: hhinnant at apple.com
        ReportedBy: jonathan.sauer at gmx.de
                CC: llvmbugs at cs.uiuc.edu


The following program compiles, but does not link with clang r134322 and libc++
r134322:

#include <string>

int main(int, char** argv)
{
    std::string    s;

    s.append(argv[0], argv[0] + 1);
}


clang++ -std=c++0x -stdlib=libc++ clang.cpp 
Undefined symbols:
 
"__ZNSt3__112basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEE6appendIPcEENS_9enable_ifIXsr21__is_forward_iteratorIT_EE5valueERS5_E4typeES9_S9_",
referenced from:
      _main in cc-u2Adwb.o


The reason for this is the missing implementation of a few specialized template
methods in libc++'s string.cpp file (only the prototypes are there).

Commenting the "extern template ..." lines in <string> (lines 3972 to 4020)
makes the problem go away (as the compiler simply instanciates the
non-specialized template methods).

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