Meson: Add glib_checks and glib_asserts options

In cases where performance are critical it can be useful to disable
checks and asserts. GStreamer has those options too, using the same name
and setting them yielding means we can set those options on the main
project (e.g. gst-build) and glib will inherit the same value when built
as subproject.

.gitlab-ci.yml

@@ -178,8 +178,6 @@ G_DISABLE_ASSERT:
   extends: .build
   image: $FEDORA_IMAGE
   stage: build
-  variables:
-    CPPFLAGS: "-DG_DISABLE_ASSERT"
   script:
     - meson ${MESON_COMMON_OPTIONS}
             --werror
@@ -187,6 +185,7 @@ G_DISABLE_ASSERT:
             -Ddtrace=true
             -Dfam=true
             -Dinstalled_tests=true
+            -Dglib_assert=false
             _build
     - ninja -C _build
     - bash -x ./.gitlab-ci/run-tests.sh

docs/macros.txt

@@ -5,9 +5,10 @@ GLib's configure options and corresponding macros
 	none
 --buildtype={debug,debugoptimized}	[debugoptimized is the default]
 	-DG_ENABLE_DEBUG -g
-
-Available to define yourself:
-	-DG_DISABLE_ASSERT -DG_DISABLE_CHECKS
+-Dglib_asserts=false
+	-DG_DISABLE_ASSERT
+-Dglib_checks=false
+	-DG_DISABLE_CHECKS
 
 Besides these, there are some local feature specific options, but my main
 focus here is to concentrate on macros that affect overall GLib behaviour

meson.build

@@ -233,6 +233,16 @@ elif get_option('optimization') in ['2', '3', 's']
   message('Disabling cast checks')
 endif
 
+if not get_option('glib_assert')
+  glib_debug_cflags += ['-DG_DISABLE_ASSERT']
+  message('Disabling GLib asserts')
+endif
+
+if not get_option('glib_checks')
+  glib_debug_cflags += ['-DG_DISABLE_CHECKS']
+  message('Disabling GLib checks')
+endif
+
 add_project_arguments(glib_debug_cflags, language: 'c')
 
 # check for header files

meson_options.txt

@@ -94,3 +94,15 @@ option('oss_fuzz',
        type : 'feature',
        value : 'disabled',
        description : 'Indicate oss-fuzz build environment')
+
+option('glib_assert',
+       type : 'boolean',
+       value : true,
+       yield : true,
+       description : 'Enable GLib assertion (see docs/macros.txt)')
+
+option('glib_checks',
+       type : 'boolean',
+       value : true,
+       yield : true,
+       description : 'Enable GLib checks such as API guards (see docs/macros.txt)')