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From: =?UTF-8?Q?Bj=c3=b6rn_Lundin?= <b.f.lundin@gmail.com>
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Subject: Re: Checking for OS in gnatstudio project file(.gpr)
Date: Thu, 18 Jun 2020 18:44:17 +0200
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Den 2020-06-18 kl. 13:32, skrev ldries46:
> I em in neede for a possibility to check within a .gpr file which 
> operating system is runnung. Is there a way to do that? So I can use the 
> same project file without changing  the .gpr file when compiling a 
> program on different OS'ses.
As others have replied you can use scenario variables.
And they are passed from commandline.
But gprbuild looks for variables passed in with -X like -XVARIBLE=Value
however if that is not found it will look for that name amomg the 
environent variables

so I create env vars for current os/arch/db in the os
and test on every combination needed
db_libs := ();
case db is
   when Oracle     => db_libs := db_lib1;
   when Postgresql => db_libs := db_lib2;
   when sqlserver  => db_libs := db_lib3;
end case


other_libs := ():
case os_arch is
  when AIX_PPC   => other_libs := lib1;
  when Linux_x64 => other_libs := lib2;
  when Linux_arm => other_libs := lib3;
  when Win_64    => other_libs := lib4;
end case

and so on

the use db_libs and other-libs elsewhere in the gprfile



-- 
Björn