[Bug middle-end/50598] [4.7 Regression] Undefined symbols: "___emutls_v.*", ... on *-apple-darwin*

[vincenzo.innocente at cern dot ch]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50598

vincenzo Innocente <vincenzo.innocente at cern dot ch> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |vincenzo.innocente at cern
                   |                            |dot ch

--- Comment #25 from vincenzo Innocente <vincenzo.innocente at cern dot ch> 2011-11-17 11:11:34 UTC ---
confirm solved
cat once.cpp 
#include<mutex>
#include<iostream>

int main() {

  std::once_flag flag;
  std::call_once(flag,[](){std::cout << "hi" << std::endl;});

  return 0;
}
Vincenzos-MacBook-Pro:ExercisesBertinoro09 innocent$ c++ -v
Using built-in specs.
COLLECT_GCC=c++
COLLECT_LTO_WRAPPER=/usr/local/libexec/gcc/x86_64-apple-darwin11.2.0/4.7.0/lto-wrapper
Target: x86_64-apple-darwin11.2.0
Configured with: ./configure --enable-languages=c,c++,fortran
--disable-multilib --disable-bootstrap --enable-lto -disable-libitm
Thread model: posix
gcc version 4.7.0 20111112 (experimental) (GCC) 
Vincenzos-MacBook-Pro:ExercisesBertinoro09 innocent$ c++ -Ofast -pthread
-std=gnu++11 once.cpp 
Undefined symbols for architecture x86_64:
  "___emutls_v._ZSt15__once_callable", referenced from:
      _main in ccCeliaX.o
ld: symbol(s) not found for architecture x86_64
collect2: error: ld returned 1 exit status
Vincenzos-MacBook-Pro:ExercisesBertinoro09 innocent$ c++ -v
Using built-in specs.
COLLECT_GCC=c++
COLLECT_LTO_WRAPPER=/usr/local/libexec/gcc/x86_64-apple-darwin11.2.0/4.7.0/lto-wrapper
Target: x86_64-apple-darwin11.2.0
Configured with: ./configure --enable-languages=c,c++,fortran
--disable-multilib --disable-bootstrap --enable-lto -disable-libitm
Thread model: posix
gcc version 4.7.0 20111117 (experimental) (GCC) 
Vincenzos-MacBook-Pro:ExercisesBertinoro09 innocent$ c++ -Ofast -pthread
-std=gnu++11 once.cpp