2007-11-07 Matthias Clasen <mclasen@redhat.com>
* *.c: Make header include order consistent (#71704,
Diego Escalante Urrelo)
svn path=/trunk/; revision=5817
2007-07-09 Matthias Clasen <mclasen@redhat.com>
* gmodule.c (g_module_open): Include the module file
name to the error message given when module initialization
fails. (#448484, Gustavo Carneiro)
svn path=/trunk/; revision=5611
Mon Sep 11 14:58:56 2006 Tim Janik <timj@imendio.com>
* gmodule.c: applied patch from Christian Persch to support
G_DEBUG flags resident-modules and bind-now-modules, bug #345099.
2004-12-31 Tor Lillqvist <tml@iki.fi>
* gmodule.c (g_module_open): It's wrong to call g_file_test() with
more than one test (both G_FILE_TEST_EXISTS and _IS_REGULAR). (It
would succeed even if the pathname existed as a nonregular file.)
Just G_FILE_TEST_IS_REGULAR works fine. (#162594)
2004-11-04 Tor Lillqvist <tml@iki.fi>
* gmodule-win32.c (_g_module_open): Argument is in UTF-8. Use wide
character Win32 API if present.
* gmodule.c (parse_libtool_archive, g_module_open): Convert file
name to UTF-8 before storing in the error message string.
* gmodule.c (parse_libtool_archive): Use g_open().
Sun Feb 22 02:28:43 2004 Matthias Clasen <maclas@gmx.de>
* configure.in: Set the gmodule suffix to 'a' for aix and
use the aix gmodule implementation. (#85930, Laurent Vivier)
Bug #85930, Laurent Vivier:
* gmodule-ar.c: Implementation of native module management for AIX.
* gmoduleconf.h.in:
* gmodule.c: Support gmodule-ar.c
Fri Feb 20 02:39:03 2004 Tim Janik <timj@gtk.org>
* applied patch from David Schleef <ds@schleef.org> which implements
a G_MODULE_BIND_LOCAL flag to g_module_open() to disable global
symbol registration.
Tue Dec 3 20:56:19 2002 Owen Taylor <otaylor@redhat.com>
* gmodule.c (g_module_open): Properly refcount the
main module if it is already open. (#98648)
Sun Feb 17 18:15:22 2002 Owen Taylor <otaylor@redhat.com>
* gmodule.c (g_module_open): Fix typo when checking
if file + module_suffix exists. (Miroslaw Dobrzanski-Neumann,
#71801)
2001-07-30 Sebastian Wilhelmi <wilhelmi@ira.uka.de>
* gmodule/gmodule.c (parse_libtool_archive): build the library
name ourselfs ... so we can load the library specified and not
mangle any name not beggining in 'lib'. Patch from Michael Meeks
<michael@ximian.com>.
* .cvsignore: Add some generated files.
* glib/gmain.c: (g_main_context_iterate): Comment out cruft
after #endif to avoid gcc warning.
* gmodule/gmodule.c: (g_module_set_error_unduped): Remove
const from type to avoid gcc warning.
* gobject/gsignal.c: (g_signal_emitv): ifdef variable used
only if G_ENABLE_DEBUG to avoid gcc warning.
* gobject/gtype.c: (type_iface_vtable_init_Wm),
(type_iface_vtable_finalize_Wm): ifdef call needed only
if !G_DISABLE_ASSERT to avoid gcc warning.
* tests/testglib.c: (main): ifdef call needed only if
!G_DISABLE_ASSERT to avoid gcc warning. Maybe later we
should make the test to #undef G_DISABLE_ASSERT.
* tests/unicode-collate.c: Add include of <string.h> to
avoid gcc warning.
Wed Jun 20 12:00:54 2001 Owen Taylor <otaylor@redhat.com>
Changes for 64-bit cleanliness, loosely based on patch
from Mark Murnane.
* gconvert.c (g_convert/g_convert_with_fallback): Remove
workarounds for since-fixed GNU libc bugs. Minor
doc fix.
* gconvert.[ch]: Change gint to gsize/gssize as
appropriate.
* gconvert.c (g_locale/filename_to/from_utf8): Fix incorrect
computation of bytes_read / bytes_written.
* gfileutils.[ch] (g_file_get_contents): Make length
out parameter 'gsize *len'.
* ghook.c (g_hook_compare_ids): Don't compare a
and b as 'a - b'.
* gmacros.h (GSIZE_TO_POINTER): Add GPOINTER_TO_SIZE,
GSIZE_TO_POINTER.
* gmain.c (g_timeout_prepare): Rewrite to avoid
overflows. (Fixes bug when system clock skews
backwards more than 24 days.)
* gmarkup.[ch]: Make lengths passed to callbacks
gsize, length for g_markup_parse-context_parse(),
g_markup_escape_text() gssize.
* gmessages.[ch] (g_printf_string_upper_bound): Change
return value to gsize.
* gmessages.c (printf_string_upper_bound): Remove
a ridiculous use of 'inline' on a 300 line function.
* gstring.[ch]: Represent size of string as a gsize,
not gint. Make parameters to functions take gsize,
or gssize where -1 is allowed.
* gstring.c (g_string_erase): Make
g_string_erase (string, pos, -1) a synonym for
g_string_truncate for consistency with other G*
APIs.
* gstrfuncs.[ch]: Make all functions taking a string
length, take a gsize, or gssize if -1 is allowed.
(g_strstr_len, g_strrstr_len). Also fix some boundary
conditions in g_str[r]str[_len].
* gutf8.c tests/unicode-encoding.c: Make parameters that
are byte lengths gsize, gssize as appropriate. Make
character offsets, other counts, glong.
* gasyncqueue.c gcompletion.c
timeloop.c timeloop-basic.c gutils.c gspawn.c.
Small 64 bit cleanliness fixups.
* glist.c (g_list_sort2, g_list_sort_real): Fix functions
that should have been static.
* gdate.c (g_date_fill_parse_tokens): Fix extra
declaration that was shadowing another.
* tests/module-test.c: Include string.h
Mon Jun 18 15:43:29 2001 Owen Taylor <otaylor@redhat.com>
* gutf8.c (g_get_charset): Make argument
G_CONST_RETURN char **.
Tue May 29 12:57:51 2001 Tim Janik <timj@gtk.org>
* gmodule.c (g_module_symbol): erk, strconcat needs NULL as last arg.
make sure we pass module name with suffix into backend open.
Mon May 28 20:19:25 2001 Tim Janik <timj@gtk.org>
* gmodule.c (g_module_open): as a last resort, if we can't access()
the module, leave it up to the platform backends to find it.
(fixes implicit search patch loading i broke with my last
commit, spotted by Padraig O'Briain).
Sun May 27 05:09:18 2001 Tim Janik <timj@gtk.org>
* gmain.c (g_main_context_prepare): unlock context when bailing
out with a warning.
(g_main_context_check): same here.
* gmain.c (g_main_context_check): before returning due to
changed pollfds, unlock context.
Sun May 27 04:52:28 2001 Tim Janik <timj@gtk.org>
* gsignal.[hc] (g_signal_stop_emission_by_name): added variant
to stop signal emissions through a detailed_signal string.
* gsignal.c (signal_emit_R) (g_signal_emit_valist): account for
the fact that g_value_* functions may cause signal emissons by
unlocking the global signal system lock around g_value_* functions.
(signal_emit_unlocked_R): renamed this from signal_emit_R() to reflect
that this functions acquires the lock on its own now.
* gmodule-dyld.c: gmodule implementation for Darwin/Mac OS X
* gmodule.c:
* gmoduleconf.h.in: Add gmodule-dyld support
* testgmodule.c (main): Fix spelling
2001-01-27 Tor Lillqvist <tml@iki.fi>
* gmodule.c: (Win32) Need <io.h> for open() and close().
2001-01-27 Tor Lillqvist <tml@iki.fi>
* makefile.msc.in: Don't try to compile gmarshal.c on its own.
2000-12-22 Sebastian Wilhelmi <wilhelmi@ira.uka.de>
* configure.in: Determine the suffix of the shared librarries for
this system. This is done analogous to
ltconfig.sh. G_MODULE_SUFFIX in glibconfig.h is set to either
"sl", "dll", or (most often) "so".
* tests/Makefile.am, tests/module-test.c,
tests/libmoduletestplugin_a.c, tests/libmoduletestplugin_b.c:
Added new testcase for gmodule. This is mostly copied from
gmodule/testgmodule.c, but unlike that is is quiet. (Why BTW are
some tests that verbose, not to say loquacious...)
* gmodule.c: Make g_module_open more tolerant wrt to the module
name. First it tries to open the module as named, if that fails,
it checks, whether it is a libtool archive and parses it, if that
fails it appends the systems shared library suffix
(i.e. ".so") (if not already found) and tries again and if that
fails it tries to append the ".la" libtool suffix (if not already
found) and parses it.
* gmodule.c: Lock recursive mutex during most module functions for
safety.
* gmodule-dl.c: Return an error from _g_module_symbol only, if
dlerror says so. All other functions return an error as well, if
dlerror returns NULL.
* testgmodule.c: Thanks to the above change the #ifdefs have
vanished.
* glib/glib-sections.txt: Added G_MODULE_SUFFIX.
* glib/tmpl/modules.sgml: Updated.
Wed Jul 26 12:59:31 2000 Tim Janik <timj@gtk.org>
* *.[hc]: applied patch from Andreas Persenius <ndap@swipnet.se> that
updates the license headers to the GNU Lesser General Public License,
as well as updating the copyright year to 2000.
2000-03-04 Tor Lillqvist <tml@iki.fi>
* gwin32.c (g_win32_error_message): New function that returns the
message string for a Win32 error code.
* glib.h: Declare it.
* glib.def: Export it, plus g_node_copy.
* gmodule-win32.c: Call g_win32_error_message() to get the error
message strings.
* libgplugin_a.c
* libgplugin_b.c
* gmodule.c: Remove LibMain functions that were needed by LCC,
which is not a supported compiler.
* testgmodule.c (main): Test for G_MODULE_IMPL ==
G_MODULE_IMPL_WIN32, not G_OS_WIN32.
* gmoduleconf.h.win32: Remove LCC stuff from here, too.
Wed Mar 1 05:34:47 2000 Tim Janik <timj@gtk.org>
* gmodule-beos.c (_g_module_symbol): do not return NULL symbols.
* gmodule-os2.c: removed NetBSD specific defines.
(_g_module_self): set an error message for unsupported behaviour.
* gmodule-beos.c: many coding style fixups.
(_g_module_open):
(_g_module_self):
(_g_module_close):
(_g_module_symbol): bunch of memory leaks plugged.
* gmodule-dl.c: make sure the error message returned from dlerror()
is always != NULL, by using a wrapper function fetch_dlerror(). based
on a patch to fix _g_module_symbol() for NetBSD from Scott Presnell
<srp@zgi.com>.
* gmodule-dld.c: minor indentation.
* gmodule-win32.c: minor cleanups.
* merges from glib-1-2.
found; this leads to an incorrect return value of g_module_symbol.]
2000-01-13 Martin Baulig <martin@home-of-linux.org>
* gmodule.c (g_module_open): Check whether `check_init' is not NULL
before we attempt to call it.
Sat Jul 24 20:11:35 1999 Tim Janik <timj@gtk.org>
* merged GLib 1.3.0 with glib-1.2.3 from Fri Jul 16 22:18:36.
* incorporated proposed cleanups from gtk-devel-list.
* bumped version number to GLib-1.3.1
* glib.h:
* gqueue.c:
* gstring.c:
* glist.c:
removed string tokenisation (we got g_strsplit() and g_strjoin()
already) and readline functions.
s/g_list_delete/g_list_delete_link.
implemented g_slist_delete_link.
removed notion of g_ATEXIT() macro in glib.h, this is an *internal*
macro, g_atexit() is provided for public consumption.
added GTrashStack inline utility functions.
reimplement double eneded queues.
removed GStack implementation, people can use a queue or a (singly)
linked list for this task.
deprecated g_strescape(), we need the SunOS variants here.
* gdate.c: added DEBUG_MSG() macro to wrap old messages.
* *.*: CVS merges.
* upgrade to libtool 1.3.3.
Sat May 8 01:52:29 CDT 1999 Shawn T. Amundson <amundson@gtk.org>
* configure.in
gerror.c
gmain.c
gstrfuncs.c
gutils.c
ltconfig
ltmain.sh
gmodule/Makefile.am
gmodule/gmodule.c
gmodule/gmoduleconf.h.in
gmodule/gmodule-beos.c
gthread/Makefile.am: Port to BeOS by myself and Richard Offer.
* makefile.msc.in makefile.cygwin.in glibconfig.h.win32.in
config.h.win32.in tests/makefile.msc.in tests/makefile.cygwin.in:
New files, used to generate corresponding non-.in files when
making a dist. This is just so the version numbers will be kept in
synch automatically.
* configure.in: Also substitute @GLIB_MAJOR_VERSION@,
@GLIB_MINOR_VERSION@, and @GLIB_INTERFACE_AGE@.
* Makefile.am tests/Makefile.am: Also distribute makefile.cygwin.
* gerror.c (g_on_error_query): On Win32, put up a MessageBox and
then exit.
* glib.def: Add a couple of functions.
Wed Feb 24 00:08:42 CST 1999 Shawn T. Amundson <amundson@gtk.org>
* *.[ch]: inserted additional note to look for ChangeLog and
AUTHORS file for a log of modifications.
Wed Feb 10 12:06:30 1999 Tim Janik <timj@gtk.org>
* gmodule.c (CHECK_ERROR): be more descriptive on unsupported systems.
Wed Feb 10 12:01:42 1999 Tim Janik <timj@gtk.org>
* configure.in: don't reset G_MODULE_IMPL, so it can be overridden
from the command line.
1999-02-10 Sebastian Wilhelmi <wilhelmi@ira.uka.de>
* glib.h: s/G_LOCK_DECLARE/G_LOCK_DEFINE/ throuhout glib. Added
G_LOCK_EXTERN macro to declare a lock externally.
Wed Feb 10 07:56:33 1999 Tim Janik <timj@gtk.org>
* gmodule.c (g_module_error): fixed errernerous code wrt to thread
specific error string allocation handling.
Wed Feb 10 06:20:30 1999 Tim Janik <timj@gtk.org>
* gmutex.c (g_static_private_set): invoke destroy notifier when
overwriting values, initialize new array fields with NULL.
(g_static_private_free_data): do not skip destroy notification for
data == NULL.
* gutils.c (g_direct_equal): compare pointer values directly instead
of just their guint values which is a loosing conversion for
sizeof(gpointer)==8 systems.
(g_get_any_init): restructured code so we don't use endless loops like
while (1), which boil down to an ugly alias for goto.
strip ,.* from the real name.
Wed Dec 16 03:16:58 1998 Tim Janik <timj@gtk.org>
* configure.in: version bump to 1.1.8, binary age 0, interface age 0.
* glib.h: changed g_lock() to G_LOCK(), g_unlock() to G_UNLOCK() and
g_trylock() to G_TRYLOCK(), since these are macros that expand to
nothing with --disable-threads.
changed G_LOCK_DEFINE() to G_LOCK_DECLARE() and introduced
G_LOCK_DECLARE_STATIC() to achive the results of static G_LOCK_DECLARE().
changed semantics of g_thread_supported to g_thread_supported() so it
can be used as a function like g_module_supported(). the actuall
definition is still a macro that expands into a variable for
performance reasons though.
various indentation and coding style cleanups.
* configure.in: added --enable-threads that defaults to yes.
* gmutex.c: changed tests g_thread_supported to g_thread_supported (),
changed variable settings of g_thread_supported
to g_threads_got_initialized.
garray.c:
gcache.c:
gdataset.c:
gdate.c:
ghash.c:
glist.c:
gmain.c:
gnode.c:
gslist.c:
gstring.c:
gtree.c:
gutils.c:
changed s/g_lock/G_LOCK/, s/g_unlock/G_UNLOCK/,
s/static G_LOCK_DEFINE/G_LOCK_DECLARE_STATIC/.
branch. See the ChangeLog for details of the changes.
In brief overview:
- The set of threading functions can be set
- A default implementation is provided in -lgthread
- All static data structures are locked using these
functions if g_thread_init() is called.
Fri Nov 20 14:43:44 1998 Tim Janik <timj@gtk.org>
* gmodule.c (_g_module_build_path): added empty default imlementation
so gmodule.so compiles on systems that are not yet supported, fix from
Erik Bagfors <bagfors@hpc2n.umu.se>.
Tue Oct 27 03:00:50 1998 Tim Janik <timj@gtk.org>
* glib.h: removed dummy structure definitions for struct _GCache,
_GTree, _GTimer, _GMemChunk, _GListAllocator and _GStringChunk.
* gutils.c: implement glib's inline functions _after_ all include
statements have been processed.
removed Tor's MAXPATHLEN check since there already was one supplied
further down in this file.
(LibMain): special cased the #ifdef __LCC__ case for NATIVE_WIN32,
since lcc maybe used on other platforms as well. why in hell is this
stuff required?
(g_get_any_init): for windows, if the user name is supplied, use it as
realname also.
in general, if there is no homedir specified, use the tmpdir that
we already figured.
* gtimer.c (g_timer_elapsed): changed a g_assert() statement to
g_return_if_fail().
* applied glib-tml-981020-0.patch for WIN32 portability, added some
comments and g_return_if_fail() statements, minor indentation fixes.
ChangeLog entry from Tor Lillqvist is appended.
* glib.h (struct dirent): use lower case structure members.
* glib.h:
* makefile.lcc:
* makefile.msc:
s/COMPILING_GLIB/GLIB_COMPILATION/
1998-10-20: Tor Lillqvist <tml@iki.fi>
* README.win32 glib.def gmodule.def
* glibconfig.h.win32 gmodule/gmoduleconf.h.win32:
New files for the Windows port. The .def files list exported
symbols for the Microsoft linker and compatibles.
* configure.in:
Added checks for some platform-dependent headers: pwd.h sys/param.h
sys/select.h sys/time.h sys/times.h unistd.h, and the function lstat.
* gerror.c:
Conditionalized inclusion of system-dependent headers. Changes
for Windows: no gdb to do a stack trace. Just call abort().
* glib.h:
Changes for Windows:
Added macros G_DIR_SEPARATOR, G_DIR_SEPARATOR_S for
platform-dependent file name syntax elements. Added macros
G_SEARCHPATH_SEPARATOR, G_SEARCHPATH_SEPARATOR_S for
platform-dependent search path syntax conventions.
Added pragmas for Microsoft C to make it more pedantic.
Marked GLib's global variables for export from DLL.
Added the function g_strescape that escapes backslashes.
Added functions g_path_is_absolute and g_path_skip_root to
handle platform-dependent file name syntax.
Added the function g_getenv that expands environment variables
that contain references to other environment variables, as is
typical on Windows NT.
Added the GIOChannel structure which is used to encapsulate the
IPC mechanism used by the GIMP's plug-ins, and possibly other
things later. On Unix a GIOChannel encapsulates just a file
descriptor. On Windows it contains a file handle from _pipe() and a
few other things related to the implementation of gdk_input_add
and GIMP plug-in communication. Subject to change.
Removed duplicate declarations of the version variables.
For the Microsoft compiler, declare own implementation of
ftruncate and the <dirent.h> functions.
* gmem.c:
Define a symbolic name for the profiling table size.
* gmessages.c:
Conditionalized inclusion of unistd.h. On Windows, output using
stdio to stdout.
* gscanner.c:
Conditionalized inclusion of unistd.h. Added changes for
Microsoft C. Added CR to the skipped character set. Added small
workaround for MSC compiler bug in g_scanner_cur_value.
* gstrfuncs.c:
Added the function g_strescape, which escapes the backslash
character. Needed especially when printing Windows filenames.
* gtimer.c:
Conditionalized inclusion of unistd.h and sys/time.h. Added
implementations for Windows.
* gutils.c:
Conditionalized inclusion of platform-dependent headers. Use
the platform-independent file name syntax macros.
Conditionalize code on platform-dependent features. Added the
functions g_path_is_absolute g_path_skip_root and g_getenv.
Added the GIOChannel-related functions. Added
compiler-dependent Unix compatibility functions for Windows.
* makefile.lcc makefile.msc:
New files. Compiler-specific makefiles for LCC-Win32 and
Microsoft C. Only Microsoft C is actually supported currently.
* testglib.c:
Added pathname check cases for Windows. Added workaround for
bug in the Microsoft runtime library. Improved some tests a bit.
Tue Oct 27 04:00:11 1998 Tim Janik <timj@gtk.org>
* testgmodule.c (main): changed the #ifdef WIN32 test to NATIVE_WIN32,
this needs to be more constistent throughout the code, do we go for
NATIVE_WIN32 or WIN32?
* gmodule.c (LibMain): special cased the #ifdef __LCC__ case for
NATIVE_WIN32, since lcc maybe used on other platforms as well.
* libgplugin_a.c (LibMain):
* libgplugin_b.c (LibMain):
likewise. not sure i like this special requirement for lcc in here.
* gmodule-dl.c (_g_module_build_path):
feature empty "" directories and prepend the module name with "lib".
* gmodule-dld.c (_g_module_build_path):
* gmodule-win32.c (_g_module_build_path):
feature empty "" directories.
* we need some more magic in the _g_module_build_path variants
so we don't append/prepend lib and .so, .sl or .dll for those names
that already contain it.
* applied patch from Tor Lillqvist for g_module_build_path() and
windows support.
1998-10-20: Tor Lillqvist <tml@iki.fi>
* gmodule/gmodule-win32.c:
New file.
* gmodule/gmodule.c gmodule/gmodule.h:
Added the funcion g_module_build_path that builds the path to
a module file, decorating the name according to the system's
conventions. Added the Windows implementation.
* gmodule/libgplugin_a.c gmodule/libgplugin_b.c:
Added LibMain for LCC-Win32.
* gmodule/testgmodule.c:
Handle Windows dll names.
Wed Oct 21 19:22:58 1998 Tim Janik <timj@gtk.org>
* configure.in (G_MODULE_HAVE_DLERROR): reverted part of the changes
from Sebastian Wilhelmi (1998-10-20). don't specify a specific loading
behaviour (i.e. RTLD_NOW) when we are not sure whether it is supplied.
changed the return value from (!f2 && f1) to (!f2 || f1) so we default
to not needing an underscore. reverted the extra plugin.c building,
because .lo files are not ELF libraries, this can't work. This needs
further investigation on Solaris...
Wed Oct 21 19:58:27 1998 Tim Janik <timj@gtk.org>
* gmodule.c (g_module_symbol): fixed a string pointer bug that could
cause garbage error messages from g_module_symbol() for systems that
NEED_USCORE.
Mon Sep 21 02:22:12 1998 Tim Janik <timj@gtk.org>
* NEWS file update for upcoming release of GLib + GModule
version 1.1.3, binary age 0, interface age 0. (GModule uses
the same version numbers as GLib.)
* glib.h: swap the inclusion of of float.h and limits.h to work
around a egcs 1.1 oddity on Solaris 2.5.1 (fix provided by
Per Abrahamsen <abraham@dina.kvl.dk>).
* glib.h:
* gscanner.c: renamed the GValue union to GTokenValue, this should
not affect source compatibility in most cases.
* ghash.c: added some g_return_if_fail() statements. make
g_hash_table_lookup_node() an inline function so we save an extra
function invokation on lookups.
Mon Sep 21 01:54:48 1998 Tim Janik <timj@gtk.org>
* gmodule.h:
* gmodule.c: renamed old _de_init functionality to _unload.
modules are now expected to export:
G_MODULE_EXPORT const gchar* g_module_check_init (GModule *module);
and
G_MODULE_EXPORT void g_module_unload (GModule *module);
returning a string other than NULL from g_module_check_init() will
prevent the module from being loaded. a call to g_module_make_resident()
from g_module_unload() will prevent the module from being unloaded and
still make it resident.
Thu Sep 17 06:36:25 1998 Tim Janik <timj@gtk.org>
* glib.h:
* gdataset.c: implemented g_datalist_* along the lines of g_dataset,
but operates on an opaque gpointer *datalist; pointer, e.g. for the
implementation of GtkObject named data.
we cache a certain portion of the already freed data entries now, to
gain a slight performance improve with data reallocation.
Thu Sep 17 06:34:22 1998 Tim Janik <timj@gtk.org>
* gmodule.h:
* gmodule.c: implemented g_module_make_resident() which can be
used to make modules resident.
fixed a buglet about the optional "g_module_de_init" function in
modules, which could get invoked twice on very obscure occasions.
Thu Aug 20 07:08:16 1998 Tim Janik <timj@gtk.org>
* gmodule.c: provide no operation implementation for the underlying
_g_module_* functions, so we at least compile on systems that have
neither of G_MODULE_IMPL_DL or G_MODULE_IMPL_DLD.
Mon Aug 17 03:41:52 1998 Tim Janik <timj@gtk.org>
* gmodule.h:
* gmodule.c (g_module_open): changed the return type for the
GModuleCheckInit function to be a string, describing the error
condition.
(g_module_symbol): show the failing symbol on error messages.
