Build examples and tests only if their requirements are met

If the respective modules aren't available we cannot build the tests
and examples. We drop the qtConfig(opengl) requirement for the opengl
examples as
a, we would need to make the QtGui configuration available for that to
   work, and
b, we should not add too much detail to the tests and examples build
   configurations. Checking each test and example for every feature it
   uses would be too much.

Task-number: QTBUG-57255
Change-Id: Ifb043c81ec9e5c487765297bd65704812cd281fc
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@qt.io>

examples/examples.pro

@@ -3,19 +3,18 @@ CONFIG += no_docs_target
 
 SUBDIRS = \
     corelib \
-    dbus \
     embedded \
-    gui \
-    network \
     qpa \
-    qtconcurrent \
-    qtestlib \
-    sql \
-    touch \
-    widgets \
-    xml
+    touch
 
-qtHaveModule(gui):qtConfig(opengl): SUBDIRS += opengl
+qtHaveModule(dbus): SUBDIRS += dbus
+qtHaveModule(network): SUBDIRS += network
+qtHaveModule(testlib): SUBDIRS += qtestlib
+qtHaveModule(concurrent): SUBDIRS += qtconcurrent
+qtHaveModule(sql): SUBDIRS += sql
+qtHaveModule(widgets): SUBDIRS += widgets
+qtHaveModule(xml): SUBDIRS += xml
+qtHaveModule(gui): SUBDIRS += gui opengl
 
 aggregate.files = aggregate/examples.pro
 aggregate.path = $$[QT_INSTALL_EXAMPLES]

examples/sql/sql.pro

@@ -8,7 +8,7 @@ SUBDIRS             =   books \
                         relationaltablemodel \
                         sqlwidgetmapper
 
-!wince:  SUBDIRS   +=  masterdetail
+!wince:qtHaveModule(xml): SUBDIRS += masterdetail
 
 !wince:  SUBDIRS += \
                         querymodel \

examples/widgets/itemviews/itemviews.pro

@@ -20,3 +20,4 @@ SUBDIRS       = addressbook \
                 stardelegate \
                 storageview
 contains(DEFINES, QT_NO_DRAGANDDROP): SUBDIRS -= puzzle
+!qtHaveModule(xml): SUBDIRS -= simpledommodel

tests/auto/auto.pro

@@ -31,6 +31,8 @@ else:!qtConfig(process):                    SUBDIRS -= tools
 !qtHaveModule(concurrent):                  SUBDIRS -= concurrent
 !qtHaveModule(network):                     SUBDIRS -= network
 !qtHaveModule(dbus):                        SUBDIRS -= dbus
+!qtHaveModule(xml):                         SUBDIRS -= xml
+!qtHaveModule(sql):                         SUBDIRS -= sql
 
 # Disable the QtDBus tests if we can't connect to the session bus
 !cross_compile:qtHaveModule(dbus) {

tests/auto/corelib/io/io.pro

@@ -49,6 +49,11 @@ SUBDIRS=\
     qprocess \
     qtextstream
 
+!qtHaveModule(concurrent): SUBDIRS -= \
+    qdebug \
+    qlockfile \
+    qurl
+
 !qtConfig(private_tests): SUBDIRS -= \
     qabstractfileengine \
     qfileinfo \

tests/auto/corelib/itemmodels/itemmodels.pro

@@ -8,6 +8,10 @@ qtHaveModule(gui): SUBDIRS += \
     qidentityproxymodel \
     qitemselectionmodel \
 
-qtHaveModule(widgets): SUBDIRS += \
-    qitemmodel \
-    qsortfilterproxymodel \
+qtHaveModule(widgets) {
+    SUBDIRS += \
+        qsortfilterproxymodel
+
+    qtHaveModule(sql): SUBDIRS += \
+        qitemmodel
+}

tests/auto/corelib/mimetypes/qmimedatabase/qmimedatabase.pro

@@ -1,3 +1,5 @@
 TEMPLATE = subdirs
-SUBDIRS = qmimedatabase-xml
-unix:!mac:!qnx: SUBDIRS += qmimedatabase-cache
+qtHaveModule(concurrent) {
+    SUBDIRS = qmimedatabase-xml
+    unix:!darwin:!qnx: SUBDIRS += qmimedatabase-cache
+}

tests/auto/corelib/thread/thread.pro

@@ -6,7 +6,6 @@ SUBDIRS=\
     qresultstore \
     qfuture \
     qfuturesynchronizer \
-    qfuturewatcher \
     qmutex \
     qmutexlocker \
     qreadlocker \
@@ -18,3 +17,8 @@ SUBDIRS=\
     qthreadstorage \
     qwaitcondition \
     qwritelocker
+
+qtHaveModule(concurrent) {
+    SUBDIRS += \
+        qfuturewatcher
+}

tests/auto/corelib/xml/xml.pro

@@ -1,3 +1,3 @@
 TEMPLATE=subdirs
-qtHaveModule(network): SUBDIRS= \
+qtHaveModule(network):qtHaveModule(xml): SUBDIRS= \
     qxmlstream

tests/auto/dbus/dbus.pro

@@ -34,3 +34,6 @@ SUBDIRS+=\
            qdbusabstractinterface \
            qdbusinterface \
            qdbusmarshall
+
+!qtHaveModule(xml): SUBDIRS -= \
+           qdbusxmlparser

tests/auto/gui/text/text.pro

@@ -35,3 +35,7 @@ win32:SUBDIRS -= qtextpiecetable
            qtextpiecetable \
            qzip \
            qtextodfwriter
+
+!qtHaveModule(xml): SUBDIRS -= \
+           qcssparser \
+           qtextdocument

tests/tests.pro

@@ -1,5 +1,7 @@
 TEMPLATE = subdirs
 CONFIG += no_docs_target
+requires(qtHaveModule(testlib))
+
 SUBDIRS = auto
 
 # benchmarks in debug mode is rarely sensible