Snow Leopard Xcode中的C++ Debug构建已经破裂

Question

升级到Xcode 3.2和Snow Leopard后,我的调试版本在运行时被破坏并失败.Stringstreams似乎不起作用.它们在发布模式下工作.

我把它缩小为GCC 4.2,OSX SDK 10.6和_GLIBCXX_DEBUG预处理器符号的组合.这些是新Xcode项目的调试配置的默认值.

此代码显示了问题:

#include <iostream>
#include <string>
#include <sstream>

int main (int argc, char * const argv[]) {

    std::stringstream stream;
    std::cout << "             expected  actual" << std::endl;
    std::cout << "stream.bad:  0         " << stream.bad() << std::endl;
    std::cout << "stream.fail: 0         " << stream.fail() << std::endl;
    std::cout << "stream.eof:  0         " << stream.eof() << std::endl;
    std::cout << "stream.good: 1         " << stream.good() << std::endl;

    stream.exceptions(std::ios::badbit | std::ios::failbit | std::ios::eofbit);
    try{
        stream << 11;       //< Does not work as expected (see output)
    }catch (std::bad_cast &e) {
        std::cout << "Unexpected bad_cast: " << e.what() << std::endl;
    }catch(std::exception &e){
        std::cout << "Unexpected exception: " << e.what() << std::endl;
    }

    std::cout << "             expected  actual" << std::endl;
    std::cout << "stream.bad:  0         " << stream.bad() << std::endl;
    std::cout << "stream.fail: 0         " << stream.fail() << std::endl;
    std::cout << "stream.eof:  0         " << stream.eof() << std::endl;
    std::cout << "stream.good: 1         " << stream.good() << std::endl;
    std::cout << std::endl;
    std::cout << "EXPECT: " << 11 << std::endl;
    std::cout << "ACTUAL: " << stream.str() << std::endl;

    std::cout << std::endl << "Done" << std::endl;
    return 0;
}

字符串流插入应该有效,但是当使用GCC 4.2和_GLIBCXX_DEBUG时,'<<'运算符会抛出异常,并设置bad和fail位.

我已经尝试了这些结果的各种编译器和SDK组合: - 使用GCC 4.2,LLVM-GCC或CLANG与SDK 10.6不起作用. - 使用GCC 4.2,LLVM-GCC或CLANG与SDK 10.5确实有效. - 使用GCC 4.0与SDK 10.5或10.6工作.

如果_GLIBCXX_DEBUG被破坏或不受支持(使用SDK 10.6和GCC 4.2),那么为什么这是新项目(C++命令行)中Debug配置的默认值？

Answer 1

目前gcc 4.2不支持STL调试模式.您可以将gcc 4.0与STL调试模式一起使用,或从Debug配置中删除调试模式预处理器宏并继续使用gcc 4.2.