Allow building against a shadow-built WebKit trunk

webkittrunk.pri

@@ -1,32 +1,38 @@
+# To build Arora against WebKit trunk:
+#   export QT_WEBKIT=webkit_trunk
+#   export WEBKITDIR=$HOME/dev/webkit
 #
-# export QT_WEBKIT=webkit_trunk
-# export WEBKITDIR=$HOME/dev/webkit
-# export WEBKITBRANCH=some_cool_git_branch_of_webkit
+# Optional:
+#   export WEBKITOUTPUTDIR=$HOME/build/webkit
+#   export WEBKITBRANCH=some_cool_git_branch_of_webkit
 #
 CONFIG += $$(QT_WEBKIT)
 webkit_trunk {
     WEBKITDIR = $$(WEBKITDIR)
+    isEmpty(WEBKITDIR): error(Please point WEBKITDIR at the root of your WebKit source tree)
+
+    OUTPUT_DIR = $$(WEBKITOUTPUTDIR)
+    isEmpty(OUTPUT_DIR): OUTPUT_DIR = $$WEBKITDIR/WebKitBuild
+
     WEBKITBRANCH = $$(WEBKITBRANCH)
-    BASEDIR =  $$WEBKITDIR/WebKitBuild
     !isEmpty(WEBKITBRANCH) {
-        BASEDIR =  $$WEBKITDIR/WebKitBuild/$$WEBKITBRANCH
+        OUTPUT_DIR = $$OUTPUT_DIR/$$WEBKITBRANCH
     }
 
     # When building in debug try to link to the debug version of webkit
     # and vice versa in release, but when they can not be paired up
     # because webkit only has release or debug libs fall back to the other one
     CONFIG(debug) {
-        exists($$BASEDIR/Debug) {
-            OUTPUT_DIR = $$BASEDIR/Debug
+        exists($$OUTPUT_DIR/Debug) {
+            OUTPUT_DIR = $$OUTPUT_DIR/Debug
         } else {
-            OUTPUT_DIR = $$BASEDIR/Release
+            OUTPUT_DIR = $$OUTPUT_DIR/Release
         }
-    }
-    CONFIG(release) {
-        exists($$BASEDIR/Release) {
-            OUTPUT_DIR = $$BASEDIR/Release
+    } else:CONFIG(release) {
+        exists($$OUTPUT_DIR/Release) {
+            OUTPUT_DIR = $$OUTPUT_DIR/Release
         } else {
-            OUTPUT_DIR = $$BASEDIR/Debug
+            OUTPUT_DIR = $$OUTPUT_DIR/Debug
         }
     }