[gtk/wip/lantw/meson-Check-for-debug-and-optimization-in-the-same-way-as-GTK-4] meson: Check for debug and optimization in the same way as GTK 4

[Ting-Wei Lan <lantw src gnome org>]

commit 6d9a3e3ade388a8367d6131adeae4dc933a1d78c
Author: Ting-Wei Lan <lantw src gnome org>
Date:   Sun May 3 18:12:57 2020 +0800

    meson: Check for debug and optimization in the same way as GTK 4
    
    This should make it more consistent for people who use both GTK 3 and
    GTK 4. It also makes it less likely to accidentally disable debug.

 meson.build | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)
---
diff --git a/meson.build b/meson.build
index 976a84b6c0..ee0cae773b 100644
--- a/meson.build
+++ b/meson.build
@@ -57,13 +57,14 @@ add_project_arguments('-DGTK_VERSION="@0@"'.format(meson.project_version()), lan
 add_project_arguments('-D_GNU_SOURCE', language: 'c')
 
 gtk_debug_cflags = []
-buildtype = get_option('buildtype')
-if buildtype.startswith('debug')
+debug = get_option('debug')
+optimization = get_option('optimization')
+if debug
   gtk_debug_cflags += '-DG_ENABLE_DEBUG'
-#  if buildtype == 'debug'
-#    gtk_debug_cflags += '-DG_ENABLE_CONSISTENCY_CHECKS'
-#  endif
-elif buildtype == 'release'
+  if optimization in ['0', 'g']
+    gtk_debug_cflags += '-DG_ENABLE_CONSISTENCY_CHECKS'
+  endif
+elif optimization in ['2', '3', 's']
   gtk_debug_cflags += '-DG_DISABLE_CAST_CHECKS'
 endif