fix doc references to webkit

we can't derive the doc index paths from QMAKEMODULES, as the mkspecs dir
may not live at the repo's top level.
instead, explicitly announce the repo's top level build dirs in QTREPOS,
and use that accordingly.

Task-number: QTBUG-38862
Change-Id: I643ad2bf63c8fca0ffc44ce3457dbe8a16dcab07
Reviewed-by: Jerome Pasion <jerome.pasion@digia.com>
Reviewed-by: Topi Reiniö <topi.reinio@digia.com>

mkspecs/features/qt_build_config.prf

@@ -34,8 +34,12 @@ QMAKE_DIR_REPLACE_SANE = PRECOMPILED_DIR OBJECTS_DIR MOC_DIR RCC_DIR UI_DIR
 
 !build_pass:!isEmpty(_QMAKE_SUPER_CACHE_):force_independent {
     # When doing a -prefix build of top-level qt5/qt.pro, we need to announce
-    # this repo's module pris' location to the other repos.
-    isEmpty(MODULE_QMAKE_OUTDIR): MODULE_QMAKE_OUTDIR = $$shadowed($$dirname(_QMAKE_CONF_))
+    # this repo's output dir to the other repos.
+    MODULE_BASE_OUTDIR = $$shadowed($$dirname(_QMAKE_CONF_))
+    !contains(QTREPOS, $$MODULE_BASE_OUTDIR): \
+        cache(QTREPOS, add super, MODULE_BASE_OUTDIR)
+    # This repo's module pris' location needs to be made known to qmake.
+    isEmpty(MODULE_QMAKE_OUTDIR): MODULE_QMAKE_OUTDIR = $$MODULE_BASE_OUTDIR
     modpath = $$MODULE_QMAKE_OUTDIR/mkspecs/modules
     !contains(QMAKEMODULES, $$modpath): \
         cache(QMAKEMODULES, add super, modpath)

mkspecs/features/qt_docs.prf

@@ -23,8 +23,9 @@ QDOC += -outputdir $$QMAKE_DOCS_OUTPUTDIR
 !build_online_docs: \
     QDOC += -installdir $$[QT_INSTALL_DOCS]
 DOC_INDEXES =
-for(qmod, QMAKEMODULES): \
-    DOC_INDEXES += -indexdir $$section(qmod, /, 0, -3)/doc
+for(qrep, QTREPOS): \
+    exists($$qrep/doc): \
+        DOC_INDEXES += -indexdir $$qrep/doc
 qtver.name = QT_VERSION
 qtver.value = $$VERSION
 isEmpty(qtver.value): qtver.value = $$MODULE_VERSION