guile-gnome - make check fails when compiled against gcc 5.2 - help needed

guile-gnome - make check fails when compiled against gcc 5.2 - help needed

[David Pirotte]

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Hello,

	guile-gnome - any branch
		make check fails when compiled against gcc 5.2

I'm looking for help from someone who knows well C in general and gcc in particular,
to debug the above shortly described situation:

	note that both make and make check work fine with gcc 4.9.3 [and previous 4.x
	versions as well]

In order to reproduce, you'll only need to install the development files for the
following wrappers:
		
	glib-2.0
	gobject-2.0
	gthread-2.0	[ mandatory, scm_init_gnome_gobject_gc
				[ calls g_thread_init  

Then you need to install:

  g-wrap		[ from the source is optional
	http://www.nongnu.org/g-wrap/developers.html

  guile-cairo	[ from the source is mandatory
	http://www.nongnu.org/guile-cairo/dev/

 guile-gnome	[ from the source devel branch is preferred
			[ since it would be to help me ...
	https://www.gnu.org/software/guile-gnome/developers.html

	git clone git://git.sv.gnu.org/guile-gnome.git
	cd guile-gnome
	git checkout devel
	./autogen.sh
	./configure [--prefix=/your/prefix]
	make
	make check

	-> ... 
	;;;
	compiling .../glib/gnome/gobject/gclosure.scm ;;;
	compiled .../cache/ ... /glib/gnome/gobject/gclosure.scm.go ;;;
	WARNING: compilation of.../glib/gnome/glib.scm
	failed: ;;; ERROR: Throw to key `gruntime-error' with args
	`("%gtype-class-bind" "No GType registered with name ~A" ("GClosure") ())'.

The reason glib/gnome/glib.scm fails is actually because it uses glib/gnome/gobject/gclosure.scm
which fails to define the <gclosure> class.

The best way to reproduce the error and start to track the problem down is, imo, by doing
this, from an emacs shell in the top-level guile-gnome source tree:

	M-x run-guile
	(set! %load-path (cons (string-append (getcwd) "/glib") %load-path))
	,use (gnome gobject config)
	,use (gnome gobject utils)
	,use (gnome gobject gtype)
	,use (gnome gobject gvalue)
	,use (oop goops)
	(define-class <gclosure> (<gboxed>) #:gtype-name "GClosure")
		ERROR: In procedure %gtype-class-bind:
		ERROR: Throw to key `gruntime-error' with args `("%gtype-class-bind" "No GType registered with name ~A" ("GClosure") ())'.

		Entering a new prompt.  Type `,bt' for a backtrace or `,q' to continue.

I see the file glib/gnome/gobject/gclosure.c, at the end of the file, defines:

	static GType gcc_please_look_the_other_way;
	void
	scm_init_gnome_gobject_closures (void)
	{
	#ifndef SCM_MAGIC_SNARFER
	#include "gclosure.x"
	#endif
	    /* make sure the GClosure type is registered */
	    gcc_please_look_the_other_way = g_closure_get_type ();
	}

but that is far as I've been till now.  I don't know C well enough and this happens at a lower level then
my actual guile-gnome knowledge [still learning on both side...]  I actually don't understand yet how this
 gcc_please_look_the_other_way and scm_init_gnome_gobject_closures are 'triggered', neither this
SCM_MAGIC_SNARFER ... 

Note that, once more, this bug does not happen when using gcc < 5.0

I would be really happy to receive some help,
Thanks,
David

	For info, on debian, gclosure.h is here:
		/usr/glib-2.0/gobject/gclosure.h

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