[gtk+] build: Generate the appropriate GLib versioning checks

[Emmanuele Bassi <ebassi src gnome org>]

commit 007d9a5e19d8b3c89f7f6afdf640cae041c314b5
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Tue Apr 18 14:24:06 2017 +0100

    build: Generate the appropriate GLib versioning checks
    
    The autotools build checks the version of GLib we are depending on in
    order to generate the appropriate GLIB_VERSION values for the
    min-required/max-allowed defines.

 meson.build |   20 +++++++++++++++++---
 1 files changed, 17 insertions(+), 3 deletions(-)
---
diff --git a/meson.build b/meson.build
index fef52f2..ca20b0e 100644
--- a/meson.build
+++ b/meson.build
@@ -7,9 +7,23 @@ project('gtk+-4.0', 'c',
         meson_version : '>= 0.39.1',
         license: 'LGPLv2.1+')
 
-glib_req          = '>= 2.49.4'
-glib_min_required = 'GLIB_VERSION_2_48'
-glib_max_allowed  = 'GLIB_VERSION_2_50'
+glib_major_req = 2
+glib_minor_req = 49
+glib_micro_req = 4
+
+if glib_minor_req.is_odd()
+  glib_min_required = 'GLIB_VERSION_@0@_@1@'.format(glib_major_req, glib_minor_req - 1)
+else
+  glib_min_required = 'GLIB_VERSION_@0@_@1@'.format(glib_major_req, glib_minor_req)
+endif
+
+if glib_minor_req.is_odd()
+  glib_max_allowed = 'GLIB_VERSION_@0@_@1@'.format(glib_major_req, glib_minor_req + 1)
+else
+  glib_max_allowed = 'GLIB_VERSION_@0@_@1@'.format(glib_major_req, glib_minor_req)
+endif
+
+glib_req          = '>= @0@.@1@.@2@'.format(glib_major_req, glib_minor_req, glib_micro_req)
 pango_req         = '>= 1.37.3'
 atk_req           = '>= 2.15.1'
 cairo_req         = '>= 1.14.0'