Compilation problems with GDC/GCC

[Nicholas Wilson via Digitalmars-d-learn]

On Friday, 14 April 2017 at 11:32:57 UTC, DRex wrote:
> I have project which involves both C and D code.  For reasons 
> that are much too long to explain, I have to use GCC to compile 
> the C code into object files (GDC to compile the D code into 
> object files) and then ld to link all the object files 
> together.  Now (unless I am missing something) ld cant link D 
> object files (a whole bunch of errors about undefined 
> references to a million different things) which I can only 
> assume is attributed to ld not knowing about the D libraries 
> and runtime.  GDC can link D object files just fine, but again 
> for reasons too long to explain, I cannot use GDC to link the 
> object files together.
>
> I need to take a handful of specific C files and a handful of 
> Specific D files and link them together (and redirect it into 
> another .o object file using the -r switch of ld) but again, ld 
> can't deal with D object files.  I have tried using the 
> -Xlinker as well as -Wl switches from GDC to pass the -r switch 
> to the linker, but GDC just spews out "/usr/bin/ld: cannot find 
> -lgcc_s" and fails.
>
> Sorry if I am making no sense, if I am not being clear, let me 
> know and I will try to re-explain, hoping someone can help me.
>
> Cheers.

It is most likely the druntime libraries the linker is 
complaining about, ld most certainly can deal with D object 
files. You could try passing them to the linker, but I'm not 
familiar with the -r option and how that would interact.

One of the verbose flags of gdc will probably allow you to see 
the linker invocation (or strace or the like) and you could 
replicate that.