import std.socket

[Jonathan M Davis]

On Saturday, May 12, 2012 22:49:29 Shadow_exe wrote:
> Faced with an interesting problem:
> If I import std.sotsket in the main file (which I am passing a
> parameter for the dmd), everything works, but if I import
> std.sotsket in the include file I get this situation here:
> 
> main.d:
> module test;
> 
> import	net.local_address;
> 
> 
> void main(){
> }
> 
> net/local_address.d:
> module net.local_address;
> 
> import	std.socket;
> 
> the compiler says:
> root at 213:~/test# dmd test.d
> test.o:(.data+0xc): undefined reference to
> `_D3net13local_address12__ModuleInfoZ'
> collect2: ld returned 1 exit status
> --- errorlevel 1
> 
> 
> How to deal with it?

You have to compile all of the modules. My guess is that all you did was

dmd -w main.d

and that won't work, because then you didn't compile net/local_address.d, 
which means that it's in not any of the object files being linked and so 
naturally the linker is going to complain that it's undefined.

If you want the compiler to automatically find and compile all of the modules 
that you import in the one module that you give it, you need to use the tool 
rdmd. dmd itself works just like you'd expect from a C/C++ compiler (and the 
compilers in most languages actually) in that it won't compile the modules 
that you don't tell it to.

- Jonathan M Davis