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Date: Fri, 31 Jul 2009 00:00:21 +0200
From: Damien Carbonne <damien.carbonne@free.fr>
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Subject: gnatmake (GNAT GPL 2009): bug or feature?
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Date: 2009-07-31T00:00:22+02:00
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Hi,

I have discovered a strange behaviour with GPS today. I think it is a 
bug, but one never knows ...: an ALI file is removed in the lib 
directory of a library project, and it shouldn't (IMO).

This happens on a Linux box, with GNAT GPL 2009 and the behaviour is the 
same with GNAT GPL 2009 on windows XP (run through VirtualBox).

I managed to reproduce the problem quite simply.

Files are organised like this:
---------------------------------------------------------------------------
(rootdir)/
    glada.gpr
    gluada.gpr
    Makefile
    src/
       gl/
          gl.ads
       glu/
          glu.ads


Files are as follows:
---------------------------------------------------------------------------
glada.gpr:
project GLAda is
    for Languages use ("Ada");
    for Source_Dirs use ("src/gl/**");
    for Object_Dir use "obj/gl";
    for Library_Kind use "static";
    for Library_Dir use "lib";
    for Library_Name use "glada";
end GLAda;
---------------------------------------------------------------------------
gluada.gpr:
with "glada.gpr";
project GLUAda is
    for Languages use ("Ada");
    for Source_Dirs use ("src/glu/**");
    for Object_Dir use "obj/glu";
    for Library_Kind use "static";
    for Library_Dir use "lib";
    for Library_Name use "gluada";
end GLUAda;
---------------------------------------------------------------------------
gl.ads:
package GL is
    pragma Pure;
end GL;
---------------------------------------------------------------------------
glu.ads
package GLU is
    pragma Pure;
end GLU;
---------------------------------------------------------------------------
Makefile:
all:
	rm -fr lib obj
	gnatmake -p -Pglada.gpr
	ls -R obj lib
	gnatmake -p -Pgluada.gpr
	ls -R obj lib
---------------------------------------------------------------------------

Now, execution of make (in root directory) gives:

rm -fr lib obj
gnatmake -p -Pglada.gpr
object directory "/home/damien/dev/ws/gprbug/obj/gl" created for project 
glada
library directory "/home/damien/dev/ws/gprbug/lib" created for project glada
gcc -c -I- -gnatA /home/damien/dev/ws/gprbug/src/gl/gl.ads

building static library for project glada
ar cr /home/damien/dev/ws/gprbug/lib/libglada.a 
/home/damien/dev/ws/gprbug/obj/gl/gl.o
ranlib /home/damien/dev/ws/gprbug/lib/libglada.a
ls -R obj lib
lib:
gl.ali	libglada.a

obj:
gl

obj/gl:
gl.ali	gl.o
gnatmake -p -Pgluada.gpr
object directory "/home/damien/dev/ws/gprbug/obj/glu" created for 
project gluada
gcc -c -I- -gnatA /home/damien/dev/ws/gprbug/src/glu/glu.ads

building static library for project gluada
ar cr /home/damien/dev/ws/gprbug/lib/libgluada.a 
/home/damien/dev/ws/gprbug/obj/glu/glu.o
ranlib /home/damien/dev/ws/gprbug/lib/libgluada.a
ls -R obj lib
lib:
glu.ali  libglada.a  libgluada.a

obj:
gl  glu

obj/gl:
gl.ali	gl.o

obj/glu:
glu.ali  glu.o
---------------------------------------------------------------------------

The strange thing is that gl.ali has been created when glada project is 
generated (as expected), but removed after generation of gluada (as 
unexpected).
gl.ali is still present in obj/gl directory in the end.

So, did I make something wrong with GNAT projects?
If not, is this a known behaviour or a bug?

If you think it is a bug, I'll report it to AdaCore and try to analyse 
gnatmake to see where it can come from (GNAT GPL 2010 is still in a long 
time !)

Regards,
Damien Carbonne