require modules to define their version

otherwise they would inherit it from qtbase, which may effectively
result in a lie if building against a different release.

for convenience we define the version centrally per repo.
qtbase is special, in that we use the version defined in qglobal.h to
avoid defining it redundantly (the instance in qglobal.h is currently
needed to bootstrap qmake; the configures would need some work to change
this).

Task-number: QTBUG-29838
Change-Id: Ie9a5b0ff0d64b69ff2d34af2f7c42d6278e957cc
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

.qmake.conf

@@ -1,2 +1,5 @@
 load(qt_build_config)
 CONFIG += qt_example_installs
+
+# In qtbase, all modules follow qglobal.h
+MODULE_VERSION = $$QT_VERSION

mkspecs/features/qt_docs.prf

@@ -25,11 +25,13 @@ QDOC += -outputdir $$QMAKE_DOCS_OUTPUTDIR
 !build_online_docs: \
     QDOC += -installdir $$[QT_INSTALL_DOCS]
 qtver.name = QT_VERSION
-qtver.value = $$QT_VERSION
+qtver.value = $$VERSION
+isEmpty(qtver.value): qtver.value = $$MODULE_VERSION
+isEmpty(qtver.value): error("No version for documentation specified.")
 qtmver.name = QT_VER
-qtmver.value = $${QT_MAJOR_VERSION}.$${QT_MINOR_VERSION}
+qtmver.value = $$replace(qtver.value, ^(\\d+\\.\\d+).*$, \\1)
 qtvertag.name = QT_VERSION_TAG
-qtvertag.value = $$replace(QT_VERSION, \.,)
+qtvertag.value = $$replace(qtver.value, \.,)
 qtAddToolEnv(QDOC, qtver qtmver qtvertag)
 doc_command = $$QDOC $$QMAKE_DOCS
 prepare_docs {

mkspecs/features/qt_module.prf

@@ -20,7 +20,8 @@
 load(qt_build_config) # loads qmodule.pri if hasn't been loaded already
 
 isEmpty(MODULE):MODULE = $$section($$list($$basename(_PRO_FILE_)), ., 0, 0)
-isEmpty(VERSION):VERSION = $$QT_VERSION
+isEmpty(VERSION): VERSION = $$MODULE_VERSION
+isEmpty(VERSION): error("Module does not define version.")
 
 # Compile as shared/DLL or static according to the option given to configure
 # unless overridden. Host builds are always static