编译错误osx上的“未定义的符号”

我想在osx上尝试一个非常简单的cpp程序，只是为了让自己熟悉osx平台，所以我很惊讶地遇到任何错误消息。编译错误osx上的“未定义的符号”

下面是代码：

#include <iostream> 
using namespace std; 
int main() { 
    cout << "Hello, world!" << endl; 
    return 0; 
}

我编译运行

gcc -Wall hello.cpp -o hello

然后我得到这个 '未定义的符号' 消息：

Undefined symbols: 
    "std::basic_ostream<char, std::char_traits<char> >& std::operator<< <std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&, char const*)", referenced from: 
     _main in ccA9oElQ.o 
    "std::ios_base::Init::Init()", referenced from: 
     __static_initialization_and_destruction_0(int, int)in ccA9oElQ.o 
    "std::basic_string<char, std::char_traits<char>, std::allocator<char> >::size() const", referenced from: 
     std::__verify_grouping(char const*, unsigned long, std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)in ccA9oElQ.o 
    "std::basic_string<char, std::char_traits<char>, std::allocator<char> >::operator[](unsigned long) const", referenced from: 
     std::__verify_grouping(char const*, unsigned long, std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)in ccA9oElQ.o 
     std::__verify_grouping(char const*, unsigned long, std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)in ccA9oElQ.o 
     std::__verify_grouping(char const*, unsigned long, std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)in ccA9oElQ.o 
    "___gxx_personality_v0", referenced from: 
     std::__verify_grouping(char const*, unsigned long, std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)in ccA9oElQ.o 
     _main in ccA9oElQ.o 
     ___tcf_0 in ccA9oElQ.o 
     unsigned long const& std::min<unsigned long>(unsigned long const&, unsigned long const&)in ccA9oElQ.o 
     __static_initialization_and_destruction_0(int, int)in ccA9oElQ.o 
     global constructors keyed to mainin ccA9oElQ.o 
     CIE in ccA9oElQ.o 
    "std::ios_base::Init::~Init()", referenced from: 
     ___tcf_0 in ccA9oElQ.o 
    "std::basic_ostream<char, std::char_traits<char> >& std::endl<char, std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&)", referenced from: 
     _main in ccA9oElQ.o 
    "std::basic_ostream<char, std::char_traits<char> >::operator<<(std::basic_ostream<char, std::char_traits<char> >& (*)(std::basic_ostream<char, std::char_traits<char> >&))", referenced from: 
     _main in ccA9oElQ.o 
    "std::cout", referenced from: 
     _main in ccA9oElQ.o 
ld: symbol(s) not found 
collect2: ld returned 1 exit status

我不知道它是相关的：我有两个xcode 3和xcode 4安装在我的MBP

下面是版本信息：

$ gcc -v 
Using built-in specs. 
Target: i686-apple-darwin10 
Configured with: /var/tmp/gcc/gcc-5666.3~6/src/configure --disable-checking --enable-werror --prefix=/usr --mandir=/share/man --enable-languages=c,objc,c++,obj-c++ --program-transform-name=/^[cg][^.-]*$/s/$/-4.2/ --with-slibdir=/usr/lib --build=i686-apple-darwin10 --program-prefix=i686-apple-darwin10- --host=x86_64-apple-darwin10 --target=i686-apple-darwin10 --with-gxx-include-dir=/include/c++/4.2.1 
Thread model: posix 
gcc version 4.2.1 (Apple Inc. build 5666) (dot 3)

系统信息

$ uname -a 
Darwin mbp002.local 10.7.0 Darwin Kernel Version 10.7.0: Sat Jan 29 15:17:16 PST 2011; root:xnu-1504.9.37~1/RELEASE_I386 i386

来源

2011-05-29 Anthony Kong

使用g++而不是gcc因为你编译C++程序：

g++ -Wall hello.cpp -o hello

另外，使用clang++因为Apple在一段时间内还没有更新GCC，所以它们不可能更新它：

clang++ -Wall hello.cpp -o hello

来源

2011-05-29 09:53:20

+1，但在你的命令中它仍然是'gcc'（： – 2011-05-29 09:55:06

@Kiril不，它不是！;-)（但是，它是） – 2011-05-29 09:56:11

@Bearious：谢谢你的回答！当我尝试'clang ++'时，我得到'command not found'错误。我可以打电话给clang，但它给了我一堆错误信息。（我想这是gcc vs g ++的问题？！） – 2011-05-29 09:58:23

运行使用它的g ++

g++ -Wall hello.cpp -o hello

如果你使用gcc，C++库默认情况下不链接英寸

来源

2011-05-29 09:53:50

编译错误osx上的“未定义的符号”

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