meson: Summarize which applications and adaptation layers are built

Add the application and adaptation layers being built to the meson
summary. The summary now prints

libcamera 0.0.0

  Configuration
         Enabled pipelines: ipu3
                            raspberrypi
                            rkisp1
                            simple
                            uvcvideo
                            vimc

           Android support: True
         GStreamer support: True
    V4L2 emulation support: True
           cam application: True
          qcam application: True
                Unit tests: True

  Subprojects
                    libyuv: YES

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Hirokazu Honda <hiroh@chromium.org>

meson.build

@@ -168,4 +168,10 @@ py_mod.find_installation('python3', modules: py_modules)
 ## Summarise Configurations
 summary({
             'Enabled pipelines': pipelines,
+            'Android support': android_enabled,
+            'GStreamer support': gst_enabled,
+            'V4L2 emulation support': v4l2_enabled,
+            'cam application': cam_enabled,
+            'qcam application': qcam_enabled,
+            'Unit tests': test_enabled,
         }, section : 'Configuration')

src/cam/meson.build

@@ -3,9 +3,12 @@
 libevent = dependency('libevent_pthreads', required : get_option('cam'))
 
 if not libevent.found()
+    cam_enabled = false
     subdir_done()
 endif
 
+cam_enabled = true
+
 cam_sources = files([
     'buffer_writer.cpp',
     'capture.cpp',

src/gstreamer/meson.build

@@ -9,9 +9,12 @@ gstallocator_dep = dependency('gstreamer-allocators-1.0', version : gst_dep_vers
                               required : get_option('gstreamer'))
 
 if not glib_dep.found() or not gstvideo_dep.found() or not gstallocator_dep.found()
+    gst_enabled = false
     subdir_done()
 endif
 
+gst_enabled = true
+
 libcamera_gst_sources = [
     'gstlibcamera-utils.cpp',
     'gstlibcamera.cpp',

src/qcam/meson.build

@@ -8,9 +8,12 @@ qt5_dep = dependency('qt5',
                      version : '>=5.4')
 
 if not qt5_dep.found()
+    qcam_enabled = false
     subdir_done()
 endif
 
+qcam_enabled = true
+
 qcam_sources = files([
     '../cam/options.cpp',
     '../cam/stream_options.cpp',

src/v4l2/meson.build

@@ -1,9 +1,12 @@
 # SPDX-License-Identifier: CC0-1.0
 
 if not get_option('v4l2')
+    v4l2_enabled = false
     subdir_done()
 endif
 
+v4l2_enabled = true
+
 v4l2_compat_sources = files([
     'v4l2_camera.cpp',
     'v4l2_camera_file.cpp',

test/meson.build

@@ -1,9 +1,12 @@
 # SPDX-License-Identifier: CC0-1.0
 
 if not get_option('test')
+    test_enabled = false
     subdir_done()
 endif
 
+test_enabled = true
+
 subdir('libtest')
 
 subdir('camera')