C++ 11 thread con clang

Question

Volevo imparare l'uso dei thread C++ 11 per accelerare la compilazione della mia lingua (sì sto costruendo un compilatore: x). Il primo campione che ho provato ha lanciato diversi errori con clang (3.3 SVN). Ha compilato bene sotto GCC (4.6.3).

Ho scaricato clang e libC++ da SVN di llvm.org. clang è stato compilato con GCC (4.6.3) e libC++ è stato compilato con clang. Entrambi i makefile sono stati generati con CMake.

Per clang ho seguito questa guida: http://llvm.org/docs/GettingStarted.html#checkout

Per libC++ ho seguito questa guida: http://libcxx.llvm.org/

Il pezzo di codice che voglio per la compilazione (foobar.cpp):

#include <iostream> 
#include <thread> 

using namespace std; 

int main(void) { 
    thread t1([](void)->void { 
     cout << "foobar" << endl; 
    }); 
} 

Si compila bene con clang --std=c++0x -stdlib=libc++ -lpthread foobar.cpp ma ho un sacco di errori linker:

/tmp/foobar-59W5DR.o: In function `main': 
foobar.cpp:(.text+0x21): undefined reference to `std::__1::thread::~thread()' 
/tmp/foobar-59W5DR.o: In function `_ZNSt3__16threadC2IZ4mainE3$_0JEvEEOT_DpOT0_': 
foobar.cpp:(.text+0x5c): undefined reference to `operator new(unsigned long)' 
foobar.cpp:(.text+0x186): undefined reference to `operator delete(void*)' 
foobar.cpp:(.text+0x19b): undefined reference to `std::__1::__throw_system_error(int, char const*)' 
/tmp/foobar-59W5DR.o: In function `_ZNSt3__114__thread_proxyINS_5tupleIJZ4mainE3$_0EEEEEPvS4_': 
foobar.cpp:(.text+0x200): undefined reference to `std::__1::__thread_local_data()' 
foobar.cpp:(.text+0x211): undefined reference to `operator new(unsigned long)' 
foobar.cpp:(.text+0x23b): undefined reference to `std::__1::__thread_struct::__thread_struct()' 
foobar.cpp:(.text+0x31b): undefined reference to `operator delete(void*)' 
/tmp/foobar-59W5DR.o: In function `_ZNSt3__110unique_ptrINS_5tupleIJZ4mainE3$_0EEENS_14default_deleteIS3_EEED2Ev': 
foobar.cpp:(.text+0x3dd): undefined reference to `operator delete(void*)' 
/tmp/foobar-59W5DR.o: In function `main::$_0::operator()() const': 
foobar.cpp:(.text+0x3fc): undefined reference to `std::__1::cout' 
/tmp/foobar-59W5DR.o: In function `_ZNSt3__110unique_ptrINS_5tupleIJZ4mainE3$_0EEENS_14default_deleteIS3_EEEC2EPS3_': 
foobar.cpp:(.text+0x4e9): undefined reference to `std::terminate()' 
/tmp/foobar-59W5DR.o: In function `std::__1::__thread_specific_ptr<std::__1::__thread_struct>::reset(std::__1::__thread_struct*)': 
foobar.cpp:(.text._ZNSt3__121__thread_specific_ptrINS_15__thread_structEE5resetEPS1_[_ZNSt3__121__thread_specific_ptrINS_15__thread_structEE5resetEPS1_]+0x57): undefined reference to `std::__1::__thread_struct::~__thread_struct()' 
foobar.cpp:(.text._ZNSt3__121__thread_specific_ptrINS_15__thread_structEE5resetEPS1_[_ZNSt3__121__thread_specific_ptrINS_15__thread_structEE5resetEPS1_]+0x60): undefined reference to `operator delete(void*)' 
/tmp/foobar-59W5DR.o: In function `std::__1::basic_ostream<char, std::__1::char_traits<char> >& std::__1::operator<< <std::__1::char_traits<char> >(std::__1::basic_ostream<char, std::__1::char_traits<char> >&, char const*)': 
foobar.cpp:(.text._ZNSt3__1lsINS_11char_traitsIcEEEERNS_13basic_ostreamIcT_EES6_PKc[_ZNSt3__1lsINS_11char_traitsIcEEEERNS_13basic_ostreamIcT_EES6_PKc]+0x28): undefined reference to `std::__1::basic_ostream<char, std::__1::char_traits<char> >::sentry::sentry(std::__1::basic_ostream<char, std::__1::char_traits<char> >&)' 
foobar.cpp:(.text._ZNSt3__1lsINS_11char_traitsIcEEEERNS_13basic_ostreamIcT_EES6_PKc[_ZNSt3__1lsINS_11char_traitsIcEEEERNS_13basic_ostreamIcT_EES6_PKc]+0x1ec): undefined reference to `std::__1::ios_base::getloc() const' 
foobar.cpp:(.text._ZNSt3__1lsINS_11char_traitsIcEEEERNS_13basic_ostreamIcT_EES6_PKc[_ZNSt3__1lsINS_11char_traitsIcEEEERNS_13basic_ostreamIcT_EES6_PKc]+0x1fe): undefined reference to `std::__1::ctype<char>::id' 
foobar.cpp:(.text._ZNSt3__1lsINS_11char_traitsIcEEEERNS_13basic_ostreamIcT_EES6_PKc[_ZNSt3__1lsINS_11char_traitsIcEEEERNS_13basic_ostreamIcT_EES6_PKc]+0x206): undefined reference to `std::__1::locale::use_facet(std::__1::locale::id&) const' 
foobar.cpp:(.text._ZNSt3__1lsINS_11char_traitsIcEEEERNS_13basic_ostreamIcT_EES6_PKc[_ZNSt3__1lsINS_11char_traitsIcEEEERNS_13basic_ostreamIcT_EES6_PKc]+0x272): undefined reference to `std::__1::locale::~locale()' 
foobar.cpp:(.text._ZNSt3__1lsINS_11char_traitsIcEEEERNS_13basic_ostreamIcT_EES6_PKc[_ZNSt3__1lsINS_11char_traitsIcEEEERNS_13basic_ostreamIcT_EES6_PKc]+0x294): undefined reference to `std::__1::locale::~locale()' 
foobar.cpp:(.text._ZNSt3__1lsINS_11char_traitsIcEEEERNS_13basic_ostreamIcT_EES6_PKc[_ZNSt3__1lsINS_11char_traitsIcEEEERNS_13basic_ostreamIcT_EES6_PKc]+0x378): undefined reference to `std::__1::ios_base::clear(unsigned int)' 
foobar.cpp:(.text._ZNSt3__1lsINS_11char_traitsIcEEEERNS_13basic_ostreamIcT_EES6_PKc[_ZNSt3__1lsINS_11char_traitsIcEEEERNS_13basic_ostreamIcT_EES6_PKc]+0x3d0): undefined reference to `std::__1::basic_ostream<char, std::__1::char_traits<char> >::sentry::~sentry()' 
foobar.cpp:(.text._ZNSt3__1lsINS_11char_traitsIcEEEERNS_13basic_ostreamIcT_EES6_PKc[_ZNSt3__1lsINS_11char_traitsIcEEEERNS_13basic_ostreamIcT_EES6_PKc]+0x3dc): undefined reference to `__cxa_begin_catch' 
foobar.cpp:(.text._ZNSt3__1lsINS_11char_traitsIcEEEERNS_13basic_ostreamIcT_EES6_PKc[_ZNSt3__1lsINS_11char_traitsIcEEEERNS_13basic_ostreamIcT_EES6_PKc]+0x3f9): undefined reference to `std::__1::ios_base::__set_badbit_and_consider_rethrow()' 
foobar.cpp:(.text._ZNSt3__1lsINS_11char_traitsIcEEEERNS_13basic_ostreamIcT_EES6_PKc[_ZNSt3__1lsINS_11char_traitsIcEEEERNS_13basic_ostreamIcT_EES6_PKc]+0x403): undefined reference to `__cxa_end_catch' 
foobar.cpp:(.text._ZNSt3__1lsINS_11char_traitsIcEEEERNS_13basic_ostreamIcT_EES6_PKc[_ZNSt3__1lsINS_11char_traitsIcEEEERNS_13basic_ostreamIcT_EES6_PKc]+0x424): undefined reference to `std::__1::basic_ostream<char, std::__1::char_traits<char> >::sentry::~sentry()' 
foobar.cpp:(.text._ZNSt3__1lsINS_11char_traitsIcEEEERNS_13basic_ostreamIcT_EES6_PKc[_ZNSt3__1lsINS_11char_traitsIcEEEERNS_13basic_ostreamIcT_EES6_PKc]+0x43d): undefined reference to `__cxa_end_catch' 
foobar.cpp:(.text._ZNSt3__1lsINS_11char_traitsIcEEEERNS_13basic_ostreamIcT_EES6_PKc[_ZNSt3__1lsINS_11char_traitsIcEEEERNS_13basic_ostreamIcT_EES6_PKc]+0x466): undefined reference to `std::terminate()' 
/tmp/foobar-59W5DR.o: In function `std::__1::basic_ostream<char, std::__1::char_traits<char> >& std::__1::endl<char, std::__1::char_traits<char> >(std::__1::basic_ostream<char, std::__1::char_traits<char> >&)': 
foobar.cpp:(.text._ZNSt3__14endlIcNS_11char_traitsIcEEEERNS_13basic_ostreamIT_T0_EES7_[_ZNSt3__14endlIcNS_11char_traitsIcEEEERNS_13basic_ostreamIT_T0_EES7_]+0x38): undefined reference to `std::__1::ios_base::getloc() const' 
foobar.cpp:(.text._ZNSt3__14endlIcNS_11char_traitsIcEEEERNS_13basic_ostreamIT_T0_EES7_[_ZNSt3__14endlIcNS_11char_traitsIcEEEERNS_13basic_ostreamIT_T0_EES7_]+0x49): undefined reference to `std::__1::ctype<char>::id' 
foobar.cpp:(.text._ZNSt3__14endlIcNS_11char_traitsIcEEEERNS_13basic_ostreamIT_T0_EES7_[_ZNSt3__14endlIcNS_11char_traitsIcEEEERNS_13basic_ostreamIT_T0_EES7_]+0x55): undefined reference to `std::__1::locale::use_facet(std::__1::locale::id&) const' 
foobar.cpp:(.text._ZNSt3__14endlIcNS_11char_traitsIcEEEERNS_13basic_ostreamIT_T0_EES7_[_ZNSt3__14endlIcNS_11char_traitsIcEEEERNS_13basic_ostreamIT_T0_EES7_]+0xac): undefined reference to `std::__1::locale::~locale()' 
foobar.cpp:(.text._ZNSt3__14endlIcNS_11char_traitsIcEEEERNS_13basic_ostreamIT_T0_EES7_[_ZNSt3__14endlIcNS_11char_traitsIcEEEERNS_13basic_ostreamIT_T0_EES7_]+0xbe): undefined reference to `std::__1::locale::~locale()' 
foobar.cpp:(.text._ZNSt3__14endlIcNS_11char_traitsIcEEEERNS_13basic_ostreamIT_T0_EES7_[_ZNSt3__14endlIcNS_11char_traitsIcEEEERNS_13basic_ostreamIT_T0_EES7_]+0xcd): undefined reference to `std::__1::basic_ostream<char, std::__1::char_traits<char> >::put(char)' 
foobar.cpp:(.text._ZNSt3__14endlIcNS_11char_traitsIcEEEERNS_13basic_ostreamIT_T0_EES7_[_ZNSt3__14endlIcNS_11char_traitsIcEEEERNS_13basic_ostreamIT_T0_EES7_]+0xdd): undefined reference to `std::__1::basic_ostream<char, std::__1::char_traits<char> >::flush()' 
/tmp/foobar-59W5DR.o: In function `std::__1::ostreambuf_iterator<char, std::__1::char_traits<char> > std::__1::__pad_and_output<char, std::__1::char_traits<char> >(std::__1::ostreambuf_iterator<char, std::__1::char_traits<char> >, char const*, char const*, char const*, std::__1::ios_base&, char)': 
foobar.cpp:(.text._ZNSt3__116__pad_and_outputIcNS_11char_traitsIcEEEENS_19ostreambuf_iteratorIT_T0_EES6_PKS4_S8_S8_RNS_8ios_baseES4_[_ZNSt3__116__pad_and_outputIcNS_11char_traitsIcEEEENS_19ostreambuf_iteratorIT_T0_EES6_PKS4_S8_S8_RNS_8ios_baseES4_]+0x215): undefined reference to `std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >::__init(unsigned long, char)' 
foobar.cpp:(.text._ZNSt3__116__pad_and_outputIcNS_11char_traitsIcEEEENS_19ostreambuf_iteratorIT_T0_EES6_PKS4_S8_S8_RNS_8ios_baseES4_[_ZNSt3__116__pad_and_outputIcNS_11char_traitsIcEEEENS_19ostreambuf_iteratorIT_T0_EES6_PKS4_S8_S8_RNS_8ios_baseES4_]+0x389): undefined reference to `std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >::~basic_string()' 
foobar.cpp:(.text._ZNSt3__116__pad_and_outputIcNS_11char_traitsIcEEEENS_19ostreambuf_iteratorIT_T0_EES6_PKS4_S8_S8_RNS_8ios_baseES4_[_ZNSt3__116__pad_and_outputIcNS_11char_traitsIcEEEENS_19ostreambuf_iteratorIT_T0_EES6_PKS4_S8_S8_RNS_8ios_baseES4_]+0x3a4): undefined reference to `std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >::~basic_string()' 
/tmp/foobar-59W5DR.o:(.eh_frame+0x47): undefined reference to `__gxx_personality_v0' 
clang-3: error: linker command failed with exit code 1 (use -v to see invocation) 

Ecco le directory di ricerca standard sotto le due librerie standard. Come risultato di 'clang -WP, -v -x C++ - -fsyntax-only' ho ottenuto questo:

ho cercato clang --std=c++11 -stdlib=libc++ -llibc++ -lpthread -o foobar foobar.cpp ma il linker fallito ancora una volta, non trova libC++. Non riesco a collegarmi a libC++ o è qualcosa di più difficile?

Answer 1

Si sta compilando con clang per C non per C++.

• Per uso C clang
• per il C++ utilizzano clang ++

Il motivo per cui non ha ancora clang mettere in guardia voi è perché hai esplicitamente definito lo standard.