build: Remove sassc option

Instead, ensure that sassc is made madatory on git builds (because
it is, we don't ship CSS files anymore) and not even looked for in
release builds (because do ship CSS files there).

gtk/meson.build

@@ -839,23 +839,25 @@ gtk_gresources_xml = configure_file(output: 'gtk.gresources.xml',
   ],
 )
 
-# Build the theme files
-sassc = find_program('sassc', required: false)
-if not sassc.found() and not get_option('sassc').disabled()
-  subproject('sassc')
-  sassc = find_program('sassc', required: get_option('sassc').enabled())
-endif
+theme_deps = []
+# For git checkouts, but not for tarballs...
+if not fs.exists('theme/Adwaita/Adwaita.css')
+  # ... build the theme files
+  sassc = find_program('sassc', required: false)
+  if not sassc.found()
+    subproject('sassc')
+    sassc = find_program('sassc', required: true)
+  endif
 
-if sassc.found()
-  sassc_opts = [ '-a', '-M', '-t', 'compact' ]
+  if sassc.found()
+    sassc_opts = [ '-a', '-M', '-t', 'compact' ]
 
-  subdir('theme/Default')
+    subdir('theme/Default')
 
-  theme_deps = [
-    default_theme_deps,
-  ]
-else
-  theme_deps = []
+    theme_deps += [
+      default_theme_deps,
+    ]
+  endif
 endif
 
 gtkresources = gnome.compile_resources('gtkresources',

meson.build

@@ -24,6 +24,7 @@ cloudproviders_req = '>= 0.3.1'
 xkbcommon_req      = '>= 0.2.0'
 sysprof_req        = '>= 3.38.0'
 
+fs = import('fs')
 gnome = import('gnome')
 pkg_config = import('pkgconfig')
 

meson_options.txt

@@ -78,11 +78,6 @@ option('colord',
        value: 'disabled',
        description : 'Build colord support for the CUPS printing backend')
 
-option('sassc',
-       type: 'feature',
-       value: 'auto',
-       description: 'Rebuild themes using sassc')
-
 option('f16c',
        type: 'feature',
        value: 'enabled',