When compiling multiple source files

[ProgrammingGhost]

On Monday, 19 August 2013 at 11:01:54 UTC, Jacob Carlborg wrote:
> The compiler will start compiling the files passed on the 
> command line. It will read the files asynchronously and then 
> lex, parse build an AST and do semantic analyze.
>
> When the semantic analyze is done it will have access to all 
> import declarations. It basically starts the same processes for 
> all these imports, recursively.
>
> The reason for waiting until semantic analyze is done because 
> you can have code looking like this:
>
> mixin("import foo;");
>
> The expansion of the mixin and other similar features are done 
> in the semantic analyze phase.

So everything is parsed once and kept in memory until the 
compiler finish every source file? Is there any ram problems when 
compiling large codebases? My experience with D is limited. Are 
libraries the same as C libraries? From my understanding the 
linker figures that part out and the compiler needs a separate 
file for the definition. If I build a library in D is it the same 
as a C library or different which includes function definitions?

Sorry if I'm confused I know almost nothing about D. I stick to 
.NET, java and C++