gcc 4.7.1 支持线程吗？

Question

我按照指令 here 设置 CodeBlocks 以使用 GCC 4.7.1。我提到的页面上提供的示例编译得很好，但是当我尝试编译以下代码时，它随后产生了错误。我必须说我什至通过编译器设置（-std=c++11）设置了编译器 C++11 标志，但仍然没有运气。 编译失败的代码：

#include <iostream>
#include <thread>
#include <vector>

//This function will be called from a thread

void func(int tid) {
    std::cout << "Launched by thread " << tid << std::endl;
}

int main() {
    std::vector<std::thread> th;

    int nr_threads = 10;

    //Launch a group of threads
    for (int i = 0; i < nr_threads; ++i) {
        th.push_back(std::thread(func,i));
    }

    //Join the threads with the main thread
    for(auto &t : th){
        t.join();
    }

    return 0;
}

错误：

 main.cpp||In function 'int main()':|
 main.cpp|13|error: 'thread' is not a member of 'std'|
 main.cpp|13|error: 'thread' is not a member of 'std'|
 main.cpp|13|error: template argument 1 is invalid|
 main.cpp|13|error: template argument 2 is invalid|
 main.cpp|13|error: invalid type in declaration before ';' token|
 main.cpp|19|error: request for member 'push_back' in 'th', which is of non-class type 'int'|
 main.cpp|19|error: 'thread' is not a member of 'std'|
 main.cpp|23|error: no matching function for call to 'begin(int&)'|
 main.cpp|23|note: candidates are:|
 \include\c++\4.7.1\initializer_list|89|note: template<class _Tp> constexpr const _Tp* std::begin(std::initializer_list<_Tp>)|
 \include\c++\4.7.1\initializer_list|89|note:   template argument deduction/substitution failed:|
 main.cpp|23|note:   mismatched types 'std::initializer_list<_Tp>' and 'int'|
 \include\c++\4.7.1\bits\range_access.h|87|note: template<class _Tp, unsigned int _Nm> _Tp* std::begin(_Tp (&)[_Nm])|
 \include\c++\4.7.1\bits\range_access.h|87|note:   template argument deduction/substitution failed:|
 main.cpp|23|note:   mismatched types '_Tp [_Nm]' and 'int'|
 \include\c++\4.7.1\bits\range_access.h|58|note: template<class _Container> decltype (__cont.begin()) std::begin(const _Container&)|
 \include\c++\4.7.1\bits\range_access.h|58|note:   template argument deduction/substitution failed:|
 main.cpp|23|required from here|
 \include\c++\4.7.1\bits\range_access.h|58|error: request for member 'begin' in '__cont', which is of non-class type 'const int'|
 \include\c++\4.7.1\bits\range_access.h|48|note: template<class _Container> decltype (__cont.begin()) std::begin(_Container&)|
 \include\c++\4.7.1\bits\range_access.h|48|note:   template argument deduction/substitution failed:|
 main.cpp|23|required from here|
 \include\c++\4.7.1\bits\range_access.h|48|error: request for member 'begin' in '__cont', which is of non-class type 'int'|
 main.cpp|23|error: no matching function for call to 'end(int&)'|
 main.cpp|23|note: candidates are:|
 \include\c++\4.7.1\initializer_list|99|note: template<class _Tp> constexpr const _Tp* std::end(std::initializer_list<_Tp>)|
 \include\c++\4.7.1\initializer_list|99|note:   template argument deduction/substitution failed:|
 main.cpp|23|note:   mismatched types 'std::initializer_list<_Tp>' and 'int'|
 \include\c++\4.7.1\bits\range_access.h|97|note: template<class _Tp, unsigned int _Nm> _Tp* std::end(_Tp (&)[_Nm])|
 \include\c++\4.7.1\bits\range_access.h|97|note:   template argument deduction/substitution failed:|
 main.cpp|23|note:   mismatched types '_Tp [_Nm]' and 'int'|
 \include\c++\4.7.1\bits\range_access.h|78|note: template<class _Container> decltype (__cont.end()) std::end(const _Container&)|
 \include\c++\4.7.1\bits\range_access.h|78|note:   template argument deduction/substitution failed:|
 main.cpp|23|required from here|
 \include\c++\4.7.1\bits\range_access.h|78|error: request for member 'end' in '__cont', which is of non-class type 'const int'|
 \include\c++\4.7.1\bits\range_access.h|68|note: template<class _Container> decltype (__cont.end()) std::end(_Container&)|
 \include\c++\4.7.1\bits\range_access.h|68|note:   template argument deduction/substitution failed:|
 main.cpp|23|required from here|
 \include\c++\4.7.1\bits\range_access.h|68|error: request for member 'end' in '__cont', which is of non-class type 'int'|
 main.cpp|23|error: unable to deduce 'auto&' from '<expression error>'|
||=== Build finished: 14 errors, 4 warnings (0 minutes, 6 seconds) ===|

Answer 1

使用 mingw，gcc 的线程支持取决于您获得的构建版本。有些构建不支持线程，有些则支持。

我相信 http://code.google.com/p/mingw-builds/downloads/list 的 mingw 构建支持线程。

Answer 2

MinGW 根本无法使用 '-std=c++0x' 进行编译。很奇怪，'-std=gnu++0x' 有效。

Answer 3

尝试 MinGw 构建：

http://sourceforge.net/projects/mingwbuilds/

此安装程序将允许您选择所需的任何 MinGW，还包括 c++11 线程功能。