meson: print disabled backends in the final build summary

It's easy to miss what's not getting build otherwise

gdk/meson.build

@@ -257,7 +257,7 @@ endif
 
 gdk_backends = []
 gdk_backends_gen_headers = []  # non-public generated headers
-foreach backend : ['broadway', 'quartz', 'wayland', 'win32', 'x11']
+foreach backend : ['broadway', 'quartz', 'wayland', 'win32', 'x11', 'mir']
   if get_variable('@0@_enabled'.format(backend))
     subdir(backend)
     gdk_deps += get_variable('gdk_@0@_deps'.format(backend))

gdk/mir/Makefile.am

@@ -39,4 +39,7 @@ libgdk_mir_la_SOURCES =	\
 libgdkinclude_HEADERS = \
 	gdkmir.h
 
+EXTRA_DIST += \
+	meson.build
+
 -include $(top_srcdir)/git.mk

gdk/mir/meson.build

@@ -0,0 +1 @@
+error('Mir gdk backend not ported to meson yet')

meson.build

@@ -130,6 +130,7 @@ wayland_enabled        = get_option('wayland_backend')
 broadway_enabled       = get_option('broadway_backend')
 quartz_enabled         = get_option('quartz_backend')
 win32_enabled          = get_option('win32_backend')
+mir_enabled            = get_option('mir_backend')
 
 os_unix   = false
 os_linux  = false
@@ -907,11 +908,14 @@ gtk_pcs = ['gtk+-3.0.pc']
 gdk_pcs = ['gdk-3.0.pc']
 
 pkg_targets = ''
-foreach backend: [ 'broadway', 'quartz', 'wayland', 'win32', 'x11', ]
+disabled_backends = []
+foreach backend: [ 'broadway', 'quartz', 'wayland', 'win32', 'x11', 'mir']
   if get_variable('@0@_enabled'.format(backend))
     gtk_pcs += ['gtk+-@0@-3.0.pc'.format(backend)]
     gdk_pcs += ['gdk-@0@-3.0.pc'.format(backend)]
     pkg_targets += ' ' + backend
+  else
+    disabled_backends += [backend]
   endif
 endforeach
 pkgconf.set('GDK_BACKENDS', pkg_targets.strip())
@@ -962,8 +966,8 @@ summary = [
   '------',
   'GTK+ @0@ (@1@)'.format(gtk_version, gtk_api_version),
   '',
-  '  Display backends: @0@'.format(pkg_targets.strip()),
-  '    Print backends: @0@'.format(' '.join(print_backends)),
+  '  Display backends: @0@ [disabled: @1@]'.format(pkg_targets.strip(), ' '.join(disabled_backends)),
+  '    Print backends: @0@ [disabled: @1@]'.format(' '.join(print_backends), ' '.join(disabled_print_backends)),
   '     Cloud support: @0@'.format(get_option('cloudproviders')),
   '    Colord support: @0@'.format(get_option('colord')),
   '          Profiler: @0@'.format(get_option('profiler')),
@@ -971,6 +975,7 @@ summary = [
   '     Documentation: @0@'.format(get_option('gtk_doc')),
   '         Man pages: @0@'.format(get_option('man')),
   '       Build tests: @0@'.format(get_option('tests')),
+  '   Installed tests: @0@'.format(get_option('installed_tests')),
   '             Demos: @0@'.format(get_option('demos')),
   '          Examples: @0@'.format(get_option('examples')),
   'Directories:',

meson_options.txt

@@ -9,6 +9,8 @@ option('win32_backend', type: 'boolean', value: true,
   description : 'Enable the Windows gdk backend (only when building on Windows)')
 option('quartz_backend', type: 'boolean', value: true,
   description : 'Enable the macOS gdk backend (only when building on macOS)')
+option('mir_backend', type: 'boolean', value: false,
+  description : 'Enable the Mir gdk backend')
 
 # Optional dependencies
 option('xinerama', type: 'combo', choices : ['yes', 'no', 'auto'], value : 'auto',
@@ -39,6 +41,8 @@ option('examples', type: 'boolean', value: 'true',
   description : 'Build examples')
 option('tests', type: 'boolean', value: 'true',
   description : 'Build tests')
+option('installed_tests', type: 'boolean', value: 'false',
+  description : 'enable installed tests')
 
 # input modules
 option('builtin_immodules', type: 'combo', choices : ['yes', 'no', 'auto'],

modules/printbackends/meson.build

@@ -106,6 +106,13 @@ endif
 
 cdata.set_quoted('GTK_PRINT_BACKENDS', ','.join(print_backends))
 
+disabled_print_backends = []
+foreach backend : all_print_backends
+  if not print_backends.contains(backend)
+    disabled_print_backends += [backend]
+  endif
+endforeach
+
 # Building
 
 printbackends_args = [

testsuite/meson.build

@@ -1,3 +1,7 @@
+if get_option('installed_tests')
+  error('installed tests haven\'t been ported to meson yet')
+endif
+
 subdir('gtk')
 subdir('gdk')
 subdir('css')