我正在尝试使用g++在MacOSX上构建通用二进制文件，但是它并没有真正起作用。我已经尝试了这个简单的虚拟代码：
#include <iostream>
using namespace std;
int main() {
cout << "Hello" << endl;
}
这个很好用:
% g++ test.cpp -arch i386 -arch ppc -arch x86_64 -o test
% file test
test: Mach-O universal binary with 3 architectures
test (for architecture i386): Mach-O executable i386
test (for architecture ppc7400): Mach-O executable ppc
test (for architecture x86_64): Mach-O 64-bit executable x86_64
然而，这并不意味着：
% g++ test.cpp -arch i386 -arch ppc -arch x86_64 -arch ppc64 -o test
In file included from test.cpp:1:
/usr/include/c++/4.2.1/iostream:44:28: error: bits/c++config.h: No such file or directory
In file included from /usr/include/c++/4.2.1/ios:43,
from /usr/include/c++/4.2.1/ostream:45,
from /usr/include/c++/4.2.1/iostream:45,
from test.cpp:1:
/usr/include/c++/4.2.1/iosfwd:45:29: error: bits/c++locale.h: No such file or directory
/usr/include/c++/4.2.1/iosfwd:46:25: error: bits/c++io.h: No such file or directory
In file included from /usr/include/c++/4.2.1/bits/ios_base.h:45,
from /usr/include/c++/4.2.1/ios:48,
from /usr/include/c++/4.2.1/ostream:45,
from /usr/include/c++/4.2.1/iostream:45,
from test.cpp:1:
/usr/include/c++/4.2.1/ext/atomicity.h:39:23: error: bits/gthr.h: No such file or directory
/usr/include/c++/4.2.1/ext/atomicity.h:40:30: error: bits/atomic_word.h: No such file or directory
...
你有任何想法为什么会这样吗？
我使用的是MacOSX 10.6操作系统，已经安装了带有所有SDK的Xcode 3.2.2。默认的编译器是GCC 4.2，而GCC 4.0则会产生一些不同的错误，但行为类似。