validate qconfig-*.h against qfeatures.txt

Change-Id: I59b7e30cfaa2b1bf2c5d4a3e04b5169f3c9439b5
Reviewed-by: Joerg Bornemann <[email protected]>

configure

@@ -6670,6 +6670,7 @@ echo "QT_BUILD_PARTS += $CFG_BUILD_PARTS" >> "$QTMODULE.tmp"
 if [ -n "$CFG_SKIP_MODULES" ]; then
     echo "QT_SKIP_MODULES += $CFG_SKIP_MODULES" >> "$QTMODULE.tmp"
 fi
+echo "QT_QCONFIG_PATH = ${CFG_QCONFIG_PATH#$relpath/src/corelib/global/}" >> "$QTMODULE.tmp"
 
 cat >>"$QTMODULE.tmp" <<EOF
 host_build {

qtbase.pro

@@ -145,6 +145,17 @@ FWD_FEATURES_H = \
     '$${LITERAL_HASH}include "../../src/corelib/global/qfeatures.h"'
 write_file($$OUT_PWD/include/QtCore/qfeatures.h, FWD_FEATURES_H)|error("Aborting.")
 
+lines = $$cat($$absolute_path($$QT_QCONFIG_PATH, $$PWD/src/corelib/global), lines)
+for (line, lines) {
+    # We ignore all defines that don't follow the #ifndef + indent pattern.
+    # This makes it possible to have unchecked defines which are no features.
+    t = $$replace(line, "^$${LITERAL_HASH}  define QT_NO_(\\S+)\\s*$", "\\1")
+    !isEqual(t, $$line) {
+        isEmpty(features.$${t}.name): \
+            error("$$QT_QCONFIG_PATH disables unknown feature $$t")
+    }
+}
+
 #mkspecs
 mkspecs.path = $$[QT_HOST_DATA]/mkspecs
 mkspecs.files = \

tools/configure/configureapp.cpp

@@ -2860,6 +2860,11 @@ void Configure::generateCachefile()
         moduleStream << "QT_BUILD_PARTS += " << buildParts.join(' ') << endl;
         if (!skipModules.isEmpty())
             moduleStream << "QT_SKIP_MODULES += " << skipModules.join(' ') << endl;
+        QString qcpath = dictionary["QCONFIG_PATH"];
+        QString qlpath = sourcePath + "/src/corelib/global/";
+        if (qcpath.startsWith(qlpath))
+            qcpath.remove(0, qlpath.length());
+        moduleStream << "QT_QCONFIG_PATH = " << qcpath << endl;
         moduleStream << endl;
 
         moduleStream << "host_build {" << endl;