Document how to use CMake for Qt Concurrent

Task-number: QTBUG-73058
Change-Id: I11398c5837b45ccacb9232609317213133ef20ea
Reviewed-by: Kai Koehne <kai.koehne@qt.io>

src/concurrent/doc/qtconcurrent.qdocconf

@@ -27,15 +27,16 @@ qhp.QtConcurrent.subprojects.classes.sortPages = true
 
 tagfile                 = ../../../doc/qtconcurrent/qtconcurrent.tags
 
-depends                 += qtcore qtdoc
+depends                 += qtcore qtdoc qmake qtcmake
 
 headerdirs  += ..
 
 sourcedirs  += ..
 
 exampledirs += ../../../examples/qtconcurrent \
-               ../ \
-               snippets
+               snippets \
+               .. \
+               .
 
 manifestmeta.highlighted.names = "QtConcurrent/QtConcurrent Progress Dialog Example"
 

src/concurrent/doc/snippets/CMakeLists.txt

@@ -0,0 +1,4 @@
+#! [cmake_use]
+find_package(Qt6 COMPONENTS Concurrent REQUIRED)
+target_link_libraries(mytarget Qt::Concurrent)
+#! [cmake_use]

src/concurrent/doc/snippets/snippets.pro

@@ -0,0 +1,3 @@
+#! [qmake_use]
+QT += concurrent
+#! [qmake_use]

src/concurrent/doc/src/qtconcurrent-index.qdoc

@@ -1,6 +1,6 @@
 /****************************************************************************
 **
-** Copyright (C) 2018 The Qt Company Ltd.
+** Copyright (C) 2020 The Qt Company Ltd.
 ** Contact: https://www.qt.io/licensing/
 **
 ** This file is part of the documentation of the Qt Toolkit.
@@ -31,6 +31,14 @@
 
     \brief The Qt Concurrent module contains functionality to support concurrent execution of program code.
 
+    \include module-use.qdocinc using qt module
+    \snippet snippets/CMakeLists.txt cmake_use
+
+    See also the \l[QtDoc]{Building with CMake} overview.
+
+    \include module-use.qdocinc building with qmake
+    \snippet snippets/snippets.pro qmake_use
+
     \section1 Getting Started
 
     The QtConcurrent namespace provides high-level APIs that make it