Directly compiling a D program with other libraries

[Jeremy]

> That's a linker error, meaning the missing symbol isn't 
> available to link into the executable. You need to compile the 
> source of all the libraries you use and make sure the resultant 
> binaries are available for the linker to link into the 
> executable.
>
> The -I switch you've passed tells the compiler where to find 
> imported modules. The compiler needs parse them to know which 
> symbols are available for you to use when it's compiling your 
> code. (The current working directory is the default anyway, so 
> you don't need to pass `-I.` for that.)
>
> By default, the compiler does not compile imported modules. If 
> you add `-i` to the command line, then it will compile all of 
> the modules you import (as long as they're in the `-I` path), 
> excluding the DRuntime and Phobos modules. It will then also 
> pass all of the compiled object files to the linker, so then 
> your linker error should go away.
>

Using `-i` solved my problem, thank you very much!

> However, when you choose not to use dub, you need to also 
> ensure that you are accounting for any special compiler flags 
> the libraries you use may require (for example, specific 
> `-version` values). If they're configured to compile as static 
> or shared libraries, it may be easier just to store the source 
> for each of them outside of your project's source tree, use dub 
> to build each of them, and then pass the compiled libraries to 
> the compiler when you build your program. In that case, you 
> wouldn't use `-i`. Just make sure that `-I` is correctly 
> configured in that case.

Okay, thanks.