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Date: Thu, 16 Oct 2008 18:26:45 +0200
From: Pascal Obry <pascal@obry.net>
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To: amado.alves@gmail.com
Subject: Re: Ada for 1st year students
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Date: 2008-10-16T18:26:46+02:00
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amado.alves@gmail.com a �crit :
> Largest count of -I switches I've ever seen is around ten.

I can count a single one if I put all the sources into the same
directory. This is just bad design. If you have modules for subsystems
then you'll have very soon lot of -I and -L... And you'll also have to
manage the linker library order (not that trivial)...

> Even so I think I prefer a single gnatmake command.

Me too:

   $ gnatmake -P myapp

Don't tell me that:

   $ gnatmake -Ithis -Ithat/there/whatever -Iand/again/here main.adb \
      -largs -llibfoo -llibbar -llibwhatever -bargs -E

is easier to read, maintain and understand :)

> The hard part is finding out the paths anyway.

That no hard path. The project file does this for you. I think you do
not understand the project facility at all.

Let's have a simple example:

   application/
      appli.gpr
      src
      obj

      module1/
         module1.gpr
         src
         obj
         lib

      module2/
         module2.gpr
         src1
         src2
         obj

file: module1.gpr

   project Module1 is
      for Source_Dirs use ("src");
      for Object_Dir use "obj";
      for Library_Name use "mod1";
      for Library_Kind use "relocatable";
   end Module1;

file: module2.gpr

   project Module1 is
      for Source_Dirs use ("src1", "src2");
      for Object_Dir use "obj";
   end Module1;

file: appli.gpr

   with "module1/module1";
   with "module2/module2";
   with "gtkada";
   with "aws";

   project Appli is
      for Source_Dirs use ("src");
      for Object_Dir use "obj";
      for Main use ("runme.adb");
   end Appli;

Then to build appli:

   $ gnatmake -Pappli

It will build a relocatable library (and yes this is portable to Win32
or UNIXes) named libmod1.so, a set of sources from module2, a set of
sources from main application and will then link your executable with is
based on module1, module1 and GtkAda plus AWS. All the linker arguments
will be passed correctly and in the proper order, this just by calling:

   $ gnatmake -Pappli

So what?

So, except for anything simple with 2 or 3 sources I do create a project
file.

BTW, GPS has the notion of default project created automatically to
handle sources in the the run directory.

I hope this will dismiss all misconception about project file :)

Pascal.

-- 

--|------------------------------------------------------
--| Pascal Obry                           Team-Ada Member
--| 45, rue Gabriel Peri - 78114 Magny Les Hameaux FRANCE
--|------------------------------------------------------
--|              http://www.obry.net
--| "The best way to travel is by means of imagination"
--|
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