On Sat, Jan 01, 2005 at 08:43:51AM -0500, Jonathan Levi MD wrote:
> Happy New Year, all!
>
> I've initiated a return to studying C++, but am having trouble
> linking a simple program (following log edited for ease of reading):
>
> jonathan$ cat hello.cpp
>
> #include<iostream>
> int main(){
> std::cout << "Hello World!\n";
> return 0;
> }
>
> jonathan$ gcc -o hello hello.cpp
>
> ld: Undefined symbols:
> std::ios_base::Init::Init()
> std::ios_base::Init::~Init()
> std::cout
> std::basic_ostream<char, std::char_traits<char> >& std::operator<<
> <std::char_traits<char> >(std::basic_ostream<char,
> std::char_traits<char> >&, char const*)
> ___gxx_personality_v0
>
> Can someone tell me what's missing? --TIA as always, Jonathan
You're missing the C++ standard library.
Short answer: use g++ instead of gcc.
Longer explanation: gcc and g++ are front-ends to the same compiler;
this compiler determines which language to use based off the file's
extension (which can be overridden by a command-line switch).
However, g++ also automatically links its executables against the C++
standard library, while gcc doesn't. It is possible to use gcc to link
C++ program by specifying the C++ standard library directly on the
command line. However, the actual library binary is typically hidden
way down in the gcc installation and can be very hard to find. Using
g++ is sufficient for almost all cases.
Richard
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