[LLVMbugs] [Bug 24127] New: Cannot take pointer to std::string::append(const std::string&) method

[bugzilla-daemon at llvm.org]

https://llvm.org/bugs/show_bug.cgi?id=24127

            Bug ID: 24127
           Summary: Cannot take pointer to std::string::append(const
                    std::string&) method
           Product: libc++
           Version: 3.6
          Hardware: PC
                OS: FreeBSD
            Status: NEW
          Severity: normal
          Priority: P
         Component: All Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: amdmi3 at amdmi3.ru
                CC: dimitry at andric.com, llvmbugs at cs.uiuc.edu,
                    mclow.lists at gmail.com
    Classification: Unclassified

Trying to get pointer to std::string::append(const std::string&) method:

---
#include <string>

int main() {
    typedef std::string& (std::string::* StringMethod)(const std::string&);
    StringMethod append = &std::string::append;

    return 0;
}
---

clang++/libc++ 3.4 (FreeBSD 10.1) as well as gcc 4.8, 4.9, 5.0 compile this
fine. However with clang++/libc++ 3.6.1 (FreeBSD CURRENT r284196) I get the
following:

---
/tmp/1-efeea7.o: In function `main':
1.cc:(.text+0x19): undefined reference to `std::__1::basic_string<char,
std::__1::char_traits<char>, std::__1::allocator<char>
>::append(std::__1::basic_string<char, std::__1::char_traits<char>,
std::__1::allocator<char> > const&)'
c++: error: linker command failed with exit code 1 (use -v to see invocation)
---

with -v:

---
FreeBSD clang version 3.6.1 (tags/RELEASE_361/final 237755) 20150525
Target: x86_64-unknown-freebsd11.0
Thread model: posix
 "/usr/bin/c++" -cc1 -triple x86_64-unknown-freebsd11.0 -emit-obj -mrelax-all
-disable-free -main-file-name 1.cc -mrelocation-model static -mthread-model
posix -mdisable-fp-elim -masm-verbose -mconstructor-aliases -munwind-tables
-target-cpu x86-64 -v -dwarf-column-info -resource-dir
/usr/bin/../lib/clang/3.6.1 -internal-isystem /usr/include/c++/v1
-fdeprecated-macro -fdebug-compilation-dir /tmp -ferror-limit 19
-fmessage-length 233 -mstackrealign -fobjc-runtime=gnustep -fcxx-exceptions
-fexceptions -fdiagnostics-show-option -fcolor-diagnostics -o /tmp/1-61a9cc.o
-x c++ 1.cc
clang -cc1 version 3.6.1 based upon LLVM 3.6.1 default target
x86_64-unknown-freebsd11.0
#include "..." search starts here:
#include <...> search starts here:
 /usr/include/c++/v1
 /usr/bin/../lib/clang/3.6.1/include
 /usr/include
End of search list.
 "/usr/bin/ld" --eh-frame-hdr -dynamic-linker /libexec/ld-elf.so.1
--hash-style=both --enable-new-dtags -o a.out /usr/lib/crt1.o /usr/lib/crti.o
/usr/lib/crtbegin.o -L/usr/lib /tmp/1-61a9cc.o -lc++ -lm -lgcc --as-needed
-lgcc_s --no-as-needed -lc -lgcc --as-needed -lgcc_s --no-as-needed
/usr/lib/crtend.o /usr/lib/crtn.o
/tmp/1-61a9cc.o: In function `main':
1.cc:(.text+0x19): undefined reference to `std::__1::basic_string<char,
std::__1::char_traits<char>, std::__1::allocator<char>
>::append(std::__1::basic_string<char, std::__1::char_traits<char>,
std::__1::allocator<char> > const&)'
c++: error: linker command failed with exit code 1 (use -v to see invocation)
---

A real life case this was encountered in:

https://github.com/npge/npge/blob/a1d174cf947f613b8edd974219817ddfa8502b1f/src/model/Sequence.cpp#L383

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