meson: Revamp qt5qml plugin and example build code

Stricter and simpler. For example, now we properly error out when
gstreamer-gl-1.0 was not found when the qt5 plugin is enabled or when
a C++ compiler is not enabled.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-good/-/merge_requests/587>

5 files changed, 40 insertions, 63 deletions

diff --git a/tests/examples/qt/meson.build b/tests/examples/qt/meson.build
index 1135f1740..ede4b5a44 100644
--- a/tests/examples/qt/meson.build
+++ b/tests/examples/qt/meson.build
@@ -1,3 +1,19 @@
+if qt5_option.disabled()
+  subdir_done()
+endif
+
+# We already did all the checks when building the qt plugin
+if not qt5qml_dep.found()
+  subdir_done()
+endif
+
+qt5qml_example_deps = dependency('qt5', modules : ['Core', 'Gui', 'Widgets', 'Qml', 'Quick'],
+                         required: get_option('examples'))
+
+if not qt5qml_example_deps.found()
+  subdir_done()
+endif
+
 subdir('qmloverlay')
 subdir('qmlsink')
 subdir('qmlsink-dynamically-added')
diff --git a/tests/examples/qt/qmloverlay/meson.build b/tests/examples/qt/qmloverlay/meson.build
index 57a538333..ccf27e9e5 100644
--- a/tests/examples/qt/qmloverlay/meson.build
+++ b/tests/examples/qt/qmloverlay/meson.build
@@ -2,19 +2,9 @@ sources = [
   'main.cpp',
 ]
 
-if have_cxx and build_gstgl and gstgl_dep.found()
-  qt5_mod = import('qt5')
-  qt5qml_deps = dependency('qt5', modules : ['Core', 'Gui', 'Widgets', 'Qml', 'Quick'],
-                           required: get_option('examples'))
-
-  # FIXME Add a way to get that information out of the qt5 module
-  moc = find_program('moc-qt5', 'moc', required : get_option('examples'))
-  if qt5qml_deps.found() and moc.found()
-    qt_preprocessed = qt5_mod.preprocess(qresources : 'qmloverlay.qrc')
-    executable('qmlgloverlay', sources, qt_preprocessed,
-        dependencies : [gst_dep, qt5qml_deps],
-        c_args : gst_plugins_good_args,
-        include_directories : [configinc],
-        install: false)
-  endif
-endif
+qt_preprocessed = qt5_mod.preprocess(qresources : 'qmloverlay.qrc')
+executable('qmlgloverlay', sources, qt_preprocessed,
+    dependencies : [gst_dep, qt5qml_example_deps],
+    c_args : gst_plugins_good_args,
+    include_directories : [configinc],
+    install: false)
diff --git a/tests/examples/qt/qmlsink-dynamically-added/meson.build b/tests/examples/qt/qmlsink-dynamically-added/meson.build
index ebee3b04c..b4eb78b9c 100644
--- a/tests/examples/qt/qmlsink-dynamically-added/meson.build
+++ b/tests/examples/qt/qmlsink-dynamically-added/meson.build
@@ -2,19 +2,9 @@ sources = [
   'main.cpp',
 ]
 
-if have_cxx and build_gstgl and gstgl_dep.found()
-  qt5_mod = import('qt5')
-  qt5qml_deps = dependency('qt5', modules : ['Core', 'Gui', 'Widgets', 'Qml', 'Quick'],
-                           required: get_option('examples'))
-
-  # FIXME Add a way to get that information out of the qt5 module
-  moc = find_program('moc-qt5', 'moc', required : get_option('examples'))
-  if qt5qml_deps.found() and moc.found()
-    qt_preprocessed = qt5_mod.preprocess(qresources : 'qmlsink.qrc')
-    executable('qmlsink-dynamically-added', sources, qt_preprocessed,
-        dependencies : [gst_dep, gstgl_dep, qt5qml_deps],
-        c_args : gst_plugins_good_args,
-        include_directories : [configinc],
-        install: false)
-  endif
-endif
+qt_preprocessed = qt5_mod.preprocess(qresources : 'qmlsink.qrc')
+executable('qmlsink-dynamically-added', sources, qt_preprocessed,
+    dependencies : [gst_dep, gstgl_dep, qt5qml_example_deps],
+    c_args : gst_plugins_good_args,
+    include_directories : [configinc],
+    install: false)
diff --git a/tests/examples/qt/qmlsink/meson.build b/tests/examples/qt/qmlsink/meson.build
index 2f444372d..f2a7a1674 100644
--- a/tests/examples/qt/qmlsink/meson.build
+++ b/tests/examples/qt/qmlsink/meson.build
@@ -2,19 +2,9 @@ sources = [
   'main.cpp',
 ]
 
-if have_cxx and build_gstgl and gstgl_dep.found()
-  qt5_mod = import('qt5')
-  qt5qml_deps = dependency('qt5', modules : ['Core', 'Gui', 'Widgets', 'Qml', 'Quick'],
-                           required: get_option('examples'))
-
-  # FIXME Add a way to get that information out of the qt5 module
-  moc = find_program('moc-qt5', 'moc', required : get_option('examples'))
-  if qt5qml_deps.found() and moc.found()
-    qt_preprocessed = qt5_mod.preprocess(qresources : 'qmlsink.qrc')
-    executable('qmlsink', sources, qt_preprocessed,
-        dependencies : [gst_dep, qt5qml_deps],
-        c_args : gst_plugins_good_args,
-        include_directories : [configinc],
-        install: false)
-  endif
-endif
+qt_preprocessed = qt5_mod.preprocess(qresources : 'qmlsink.qrc')
+executable('qmlsink', sources, qt_preprocessed,
+    dependencies : [gst_dep, qt5qml_example_deps],
+    c_args : gst_plugins_good_args,
+    include_directories : [configinc],
+    install: false)
diff --git a/tests/examples/qt/qmlsrc/meson.build b/tests/examples/qt/qmlsrc/meson.build
index 122e4a617..3d55a28cb 100644
--- a/tests/examples/qt/qmlsrc/meson.build
+++ b/tests/examples/qt/qmlsrc/meson.build
@@ -2,18 +2,9 @@ sources = [
   'main.cpp',
 ]
 
-if have_cxx and build_gstgl and gstgl_dep.found()
-  qt5_mod = import('qt5')
-  qt5qml_deps = dependency('qt5', modules : ['Core', 'Gui', 'Widgets', 'Qml', 'Quick'],
-                           required: get_option('examples'))
-  # FIXME Add a way to get that information out of the qt5 module
-  moc = find_program('moc-qt5', 'moc', required : get_option('examples'))
-  if qt5qml_deps.found() and moc.found()
-    qt_preprocessed = qt5_mod.preprocess(qresources : 'qmlsrc.qrc')
-    executable('qmlsrc', sources, qt_preprocessed,
-        dependencies : [gst_dep, qt5qml_deps],
-        c_args : gst_plugins_good_args,
-        include_directories : [configinc],
-        install: false)
-  endif
-endif
+qt_preprocessed = qt5_mod.preprocess(qresources : 'qmlsrc.qrc')
+executable('qmlsrc', sources, qt_preprocessed,
+    dependencies : [gst_dep, qt5qml_example_deps],
+    c_args : gst_plugins_good_args,
+    include_directories : [configinc],
+    install: false)