VS2005/VS2008 中编译流程的一个严重bug

// In VS200X: use /J to Changes the default char type from signed char to unsigned char
// In g++   : use -funsigned-char to ...
#include
#include
using namespace std;

int main()
{
    #ifndef _CHAR_UNSIGNED
        cout << "not defined _CHAR_UNSIGNED" << endl;
    #else
        cout << "defined _CHAR_UNSIGNED" << endl; // output this word
    #endif

    cout << CHAR_MAX << endl; // output 255
    cout << CHAR_MIN << endl; // output 0

    cout << "char_max = " << (int)numeric_limits<char>::max() << endl; // output 127 ( error )
    cout << "char_min = " << (int)numeric_limits<char>::min() << endl; // output 128 ( error )

    return 0;
}

/*
查看了一下其库代码，完全正确。
错误发生在 #include 上，虽然char变了，_CHAR_UNSIGNED变了，但它根本没重新参与编译
*/