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Date: Sun, 4 Jul 2010 03:27:19 -0700 (PDT)
From: "kenny AT ca" <heqing DOT gugle AT gmail DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: Building DLLs on C++ version code failed, but okay on C version code.
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Forgot to attach error information.

hello.o:hello.cpp:(.text+0xd): undefined reference to
`std::basic_string<char, std::char_traits<char>, std::allocator<char>
>::size() const'
hello.o:hello.cpp:(.text+0x60): undefined reference to
`std::basic_string<char, std::char_traits<char>, std::allocator<char>
>::operator[](unsigned int) const'
hello.o:hello.cpp:(.text+0x9f): undefined reference to
`std::basic_string<char, std::char_traits<char>, std::allocator<char>
>::operator[](unsigned int) const'
hello.o:hello.cpp:(.text+0xce): undefined reference to
`std::basic_string<char, std::char_traits<char>, std::allocator<char>
>::operator[](unsigned int) const'
hello.o:hello.cpp:(.text+0x111): undefined reference to `std::cout'
hello.o:hello.cpp:(.text+0x116): undefined reference to
`std::basic_ostream<char, std::char_traits<char> >& std::operator<<
<std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char>
>&, char const*)'
hello.o:hello.cpp:(.text+0x11e): undefined reference to
`std::basic_ostream<char, std::char_traits<char> >& std::endl<char,
std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char>
>&)'
hello.o:hello.cpp:(.text+0x126): undefined reference to
`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> >&))'
hello.o:hello.cpp:(.text+0x149): undefined reference to
`std::ios_base::Init::Init()'
hello.o:hello.cpp:(.text+0x164): undefined reference to
`std::ios_base::Init::~Init()'
collect2: ld returned 1 exit status


kenny AT ca wrote:
> 
> Hi there,
> 
> I wrote a file, hello.c. It has only one function: print a message like
> "hello!". 
> ##### hello.c #########
> #include <stdio.h>
> void hello() { printf( "Hello.\n" ) ; }
> 
> $gcc -c hello.c
> $gcc -shared -o hello.dll hello.o
> 
> I successufully built it as DLL, hello.dll.
> 
> Then, I rewrote it in c++.
> ##### hello.cpp #######
> #include <iostream>
> using namespace std ;
> void hello() {cout << "Hello." << endl ;}
> 
> Then, I used the commands above to built DLL, but it failed. Why did it
> fail?
> 
> 

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