Export sanitizer as a global config

This is necessary for WebEngine at configure time, to be able to query
which of the sanitizers was enabled in order to report unsupported
combinations.

Task-number: QTBUG-64726
Change-Id: I72f8efe4bed3e14114f885bdae16650f1f23b24b
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@qt.io>

configure.json

@@ -867,7 +867,7 @@
         "sanitizer": {
             "label": "Sanitizers",
             "condition": "features.sanitize_address || features.sanitize_thread || features.sanitize_memory || features.sanitize_undefined",
-            "output": [ "publicConfig" ]
+            "output": [ "sanitizer", "publicConfig" ]
         },
         "GNUmake": {
             "label": "GNU make",

configure.pri

@@ -876,6 +876,19 @@ defineTest(qtConfOutput_shared) {
     export(CONFIG)
 }
 
+defineTest(qtConfOutput_sanitizer) {
+    !$${2}: return()
+
+    # Export this here, so that WebEngine can access it at configure time.
+    CONFIG += sanitizer
+    $$qtConfEvaluate("features.sanitize_address"): CONFIG += sanitize_address
+    $$qtConfEvaluate("features.sanitize_thread"): CONFIG += sanitize_thread
+    $$qtConfEvaluate("features.sanitize_memory"): CONFIG += sanitize_memory
+    $$qtConfEvaluate("features.sanitize_undefined"): CONFIG += sanitize_undefined
+
+    export(CONFIG)
+}
+
 defineTest(qtConfOutput_architecture) {
     arch = $$qtConfEvaluate("tests.architecture.arch")
     buildabi = $$qtConfEvaluate("tests.architecture.buildabi")