Re: Building DLLs on C++ version code failed, but okay on C version code.

[Bengt-Arne Fjellner <Bengt-Arne dot Fjellner at ltu dot se>]

On 2010-07-04 12:27 PM, kenny@ca wrote:
> 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@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?
> >
> >
> >      
>    
Use g++ to compile and link c++ code


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