Re: gpr and Makefiles

[mockturtle <framefritti@gmail.com>]

On Monday, January 27, 2020 at 6:49:38 PM UTC+1, Shark8 wrote:
> On Monday, January 27, 2020 at 9:22:41 AM UTC-7, mockturtle wrote:
> > 
> > foo.ads: bar.txt
> >        convert --from=bar.txt --to=foo.ads
> > 
> > What I would like is having gprbuild checking if bar.txt is newer than foo.ads; if it is, run convert and after that proceed with the actual building.
> > 
> > Is this possible?
> > 
> > I also checked Gem #152 (https://www.adacore.com/gems/gem-152-defining-a-new-language-in-a-project-file) about defining a new language inside a gpr file, but I am not sure it can be a solution.
> Why not?
> Wouldn't you just use
> 
> Package Compiler is
>   for Driver ("Converter") use "convert";
>   for Object_Generated ("Converter") use "False";
>   --...
> End Compiler;


It worked, thank you.

Actually, it was less trivial than I expected. The main problem was that gprbuild expects a command line like

   <compiler name> <pre-options> <source> <post-options>

while my command line was

   convert <output filename> <input filename>

However, since convert is actually a Ruby script I changed it to handle the case <output>=-c as an "automagical" case where the output filename is obtained from the input.