[gtkada] improvements to the GtkAda build system

[Björn Persson]

As I mentioned a week ago, I've been working on improvements to the GtkAda 
build system that I need for cleaning up the GtkAda package in Fedora. The 
patch I'm using in Fedora is made for GtkAda 2.14.1, and works as intended as 
far as I've been able to test it. The patch in this message is intended to be 
the equivalent patch for the current Subversion trunk, but it's not so well 
tested. Testing is hampered by a compilation error that I don't have time to 
investigate at the moment:

testcairo_printing.ads:51:07: not subtype conformant with operation inherited 
at line 42
testcairo_printing.ads:51:07: type of "Op" does not match

The changes to Windows-only sections are untested.

When porting the patch to the trunk I had trouble figuring out the 
subdirectories called "opengl" that have been added since 2.14.1. That change 
seems incompletely implemented and will probably not work in its current form. 
Was the intention to put only libgtkada_gl in the subdirectory, or should its 
ALI files be there too? Was it meant to have effect only on Windows or on all 
operating systems? What was the purpose of that change anyway?

These are the changes that this patch makes:

· In Fedora we package only shared libraries in most cases. Static libraries 
are packaged only when they are needed for some specific reason. Therefore I 
added the configuration options --enable-static and --disable-static, which 
control the variable BUILD_STATIC in the makefiles. The default is to build 
static libraries, like before.

· I need the libraries in /usr/lib and /usr/lib64 instead of 
/usr/lib/gtkada/relocatable, so I added the configuration options --enable-
subdirs and --disable-subdirs. The default is to put shared and static 
libraries in separate subdirectories, like before. When --disable-subdirs is 
specified, libraries end up in ${libdir} and ALI files in ${libdir}/gtkada. This 
is done with a set of variables with names like "libsubdir_static", 
"alisubdir_shared" et cetera. This is where I need to understand the "opengl" 
directories better in order to reconcile them with the --disable-subdirs 
option.

· I replaced hard-coded directory names with the corresponding variables from 
Autoconf, so that a user can change the value of bindir for example and get 
the intended result. In Fedora this is used to put 64-bit libraries in 
/usr/lib64.

· For the project files I defined the variable gprdir, which is set to 
"${prefix}/lib/gnat". Setting it to "${libdir}/gnat" would be wrong because 
Gnat looks for project files in /usr/lib/gnat, not in /usr/lib64/gnat.

· As I already mentioned, I added DESTDIR support. This is used in Fedora's 
packaging system to install the files in a staging directory, where they are 
picked up and assembled into an RPM package. This makes it possible to build 
packages as an unpriviliged user, and also makes it much easier to ensure that 
the right set of files are included in the package.

· I added a new build type, Debuginfo, which is just like Production except 
that is uses -g so that debugging information gets included in the compiled 
libraries. In Fedora's packaging system the debugging information is then 
extracted and packaged together with the source code in a separate debuginfo 
package. The result is that you get stripped binaries when you install the RPM 
packages, but if you need to debug a program you can install the relevant 
debuginfo packages and get access to function names, variable names, source 
code lines et cetera in GDB.
The default build type is still Production of course.

· I changed the installation of shared libraries to use INSTALL_PROGRAM 
instead of INSTALL_DATA, so that their executable bits don't get removed.

· The sublibraries (libgtkada_gl, libgtkada_glade and libgnomeada) depend on 
the main library (libgtkada), but weren't correctly linked to it. To fix this I 
added the variable GTKADA_LIBS to the makefiles. Something very similar has 
been added in the trunk, but only for libgtkada_gl and only on Windows.

· Even though building of shared libraries was enabled by default, the value 
of DEFAULT_LIBRARY_TYPE was "static", and was set to "relocatable" only when 
--enable-shared was explicitly specified. I fixed it so that 
DEFAULT_LIBRARY_TYPE is always "relocatable" when shared libraries are built, 
and "static" when only static libraries are built.

The 2.14.1 version of the patch may be found here if anyone is interested:
http://pkgs.fedoraproject.org/gitweb/?p=GtkAda.git;a=blob_plain;f=GtkAda-2.14.1-
configuration-3.patch;hb=HEAD

Björn Persson
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