Re: Exporting linker options from library GPR

[Simon Wright <simon@pushface.org>]

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Lucretia <laguest9000@googlemail.com> writes:

> On Tuesday, 13 February 2018 09:43:49 UTC, Luke A. Guest  wrote:
>
>> Just seen this. I have actually built SDLAda on Mac OS X, but I didn’t push
>> the changes required to get the thing built with the SDL2 framework.
>
> Just checked, I did it on the command line as a hack to get it
> compiling on Mac.
>
> It seems that GPR's cannot expand `sdl2-config --cflags` when passed
> via the GPR Default_Switches mechanism, if there's a way, I could
> clean up the makefile a bit more and shift more to the GPR.

There's probably a way if you use the makefile.

I hacked an sdlada_mac.gpr:


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project SDLAda_Mac is
   Version := "2.2.0";

   type Platform_Type is ("linux", "bsd", "windows", "macosx", "ios", "android");
   type Mode_Type is ("debug", "release");
   type Build_Type is ("static", "shared");

   Platform : Platform_Type := external ("SDL_PLATFORM", "macosx");
   Mode     : Mode_Type     := external ("SDL_MODE", "debug");
   Build    : Build_Type    := external ("SDL_BUILD", "shared");

   for Languages    use ("Ada", "C");
   for Source_Dirs  use ("../../src", "../../src/" & Platform, "gen/src/");
   for Library_Name use "sdlada";
   for Object_Dir   use "gen/" & Build & "." & Mode & "/lib/.obj";
   for Library_Dir  use "gen/" & Build & "." & Mode &  "/lib";
   for Library_Version use "libsdlada.so." & Version;

   Linking_Options := ("-F", external ("HOME") & "/Library/Frameworks",
                       "-framework", "SDL2");

   case Build is
      when "static" =>
         for Library_Kind use "static";

      when "shared" =>
         for Library_Kind use "relocatable";
         for Library_Options use Linking_Options;
   end case;

   package Compiler is
      C_Switches := ("-I" & external ("HOME") & "/Library/Frameworks/SDL2.framework/Headers");
      Ada_Switches := ("-gnat2012", "-gnata", "-gnato", "-gnatE", "-gnaty", "-gnatyM120");

      case Mode is
         when "debug" =>
            C_Switches   := C_Switches & ("-O0", "-g");
            Ada_Switches := Ada_Switches & ("-O0", "-g");

         when "release" =>
            C_Switches   := C_Switches & ("-O2", "-g");
            Ada_Switches := Ada_Switches & ("-O2", "-g");
      end case;

      for Default_Switches ("C") use C_Switches;
      for Default_Switches ("Ada") use Ada_Switches;
   end Compiler;

   package Linker is
      for Linker_Options use Linking_Options;
   end Linker;

end SDLAda_Mac;