[atk: 1/2] meson: use an autotools compatible compatibility_version/current_version on macOS. Fixes #6

[Emmanuele Bassi <ebassi src gnome org>]

commit 08d8063b972e5a9542b0d0e9b9f5ef587b74c73f
Author: Christoph Reiter <reiter christoph gmail com>
Date:   Fri Nov 16 15:14:26 2018 +0100

    meson: use an autotools compatible compatibility_version/current_version on macOS. Fixes #6
    
    Use the same versioning scheme as libtool did with the autotools build. Otherwise switching
    atk from meson to autotools makes all library linking to it fail since the version is too low.

 meson.build | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)
---
diff --git a/meson.build b/meson.build
index 0323896..7c66a8c 100644
--- a/meson.build
+++ b/meson.build
@@ -36,7 +36,9 @@ atk_conf.set_quoted('GETTEXT_PACKAGE', 'atk10')
 
 # Maintain version scheme with libtool
 atk_soversion = 0
-atk_libversion = '@0@.@1@.@2@'.format(atk_soversion, (atk_binary_age - atk_interface_age), atk_interface_age)
+current = atk_binary_age - atk_interface_age
+atk_libversion = '@0@.@1@.@2@'.format(atk_soversion, current, atk_interface_age)
+darwin_versions = ['@0@'.format(current + 1), '@0@.@1@'.format(current + 1, atk_interface_age)]
 
 add_project_arguments([ '-DG_DISABLE_SINGLE_INCLUDES', '-DATK_DISABLE_SINGLE_INCLUDES' ], language: 'c')
 
@@ -75,7 +77,7 @@ endif
 
 # Maintain compatibility with autotools on macOS
 if host_machine.system() == 'darwin'
-  common_ldflags += [ '-compatibility_version', '1', '-current_version', '1.0', ]
+  common_ldflags += [ '-compatibility_version', darwin_versions[0], '-current_version', darwin_versions[1]]
 endif
 
 # Functions