我想在osx上嘗試一個非常簡單的cpp程序,只是爲了讓自己熟悉osx平臺,所以我很驚訝地遇到任何錯誤消息。編譯錯誤osx上的「未定義的符號」
下面是代碼:
#include <iostream>
using namespace std;
int main() {
cout << "Hello, world!" << endl;
return 0;
}
我編譯運行
gcc -Wall hello.cpp -o hello
然後我得到這個 '未定義的符號' 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
我不知道它是相關的:我有兩個xcode 3和xcode 4安裝在我的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)
系統信息
$ 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
+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:謝謝你的回答!當我嘗試'clang ++'時,我得到'command not found'錯誤。我可以打電話給clang,但它給了我一堆錯誤信息。 (我想這是gcc vs g ++的問題?!) – 2011-05-29 09:58:23