Move RESOURCE flattening code to dedicated function

Introduce resources_functions.prf with the test function
qtFlattenResources which ensures that RESOURCES has a flat structure,
e.g. only contains *.qrc entries.

This can be called by other .prf files like qtquickcompiler.prf
without disturbing the ability to extend RESOURCES in other .prf files.

Task-number: QTBUG-79672
Change-Id: I43246e40f5ea52a9d9c917a1bd781aeeb1304acc
Reviewed-by: Kai Koehne <kai.koehne@qt.io>

2 files changed, 65 insertions, 57 deletions

diff --git a/mkspecs/features/resources.prf b/mkspecs/features/resources.prf
index fa8ff1fb58..ca95768de8 100644
--- a/mkspecs/features/resources.prf
+++ b/mkspecs/features/resources.prf
@@ -16,63 +16,8 @@ defineReplace(xml_escape) {
     return($$1)
 }
 
-RESOURCES += qmake_immediate
-for(resource, RESOURCES) {
-    # Regular case of user qrc file
-    contains(resource, ".*\\.qrc$"): \
-        next()
-
-    # Fallback for stand-alone files/directories
-    !defined($${resource}.files, var) {
-        !equals(resource, qmake_immediate) {
-            !exists($$absolute_path($$resource, $$_PRO_FILE_PWD_)): \
-                warning("Failure to find: $$resource")
-            qmake_immediate.files += $$resource
-            OTHER_FILES *= $$resource
-        }
-        RESOURCES -= $$resource
-        next()
-    }
-
-    resource_file = $$absolute_path($$RCC_DIR/qmake_$${resource}.qrc, $$OUT_PWD)
-
-    isEmpty(BUILDS)|build_pass {
-        # Collection of files, generate qrc file
-        prefix = $$eval($${resource}.prefix)
-        isEmpty(prefix): \
-            prefix = "/"
-
-        resource_file_content = \
-            "<!DOCTYPE RCC><RCC version=\"1.0\">" \
-            "<qresource prefix=\"$$xml_escape($$prefix)\">"
-
-        abs_base = $$absolute_path($$eval($${resource}.base), $$_PRO_FILE_PWD_)
-
-        for(file, $${resource}.files) {
-            abs_path = $$absolute_path($$file, $$_PRO_FILE_PWD_)
-            files = $$files($$abs_path/*, true)
-            isEmpty(files): \
-                files = $$abs_path
-            for (file, files) {
-                exists($$file/*): next()  # exclude directories
-                alias = $$relative_path($$file, $$abs_base)
-                resource_file_content += \
-                    "<file alias=\"$$xml_escape($$alias)\">$$xml_escape($$file)</file>"
-                OTHER_FILES *= $$file
-            }
-        }
-
-        resource_file_content += \
-            "</qresource>" \
-            "</RCC>"
-
-        !write_file($$resource_file, resource_file_content): \
-            error()
-    }
-
-    RESOURCES -= $$resource
-    RESOURCES += $$resource_file
-}
+load(resources_functions)
+qtFlattenResources()
 
 !isEmpty(RESOURCES):contains(TEMPLATE, .*lib):plugin:static {
     pluginBaseName = $$basename(TARGET)
diff --git a/mkspecs/features/resources_functions.prf b/mkspecs/features/resources_functions.prf
new file mode 100644
index 0000000000..f7fed9e524
--- /dev/null
+++ b/mkspecs/features/resources_functions.prf
@@ -0,0 +1,63 @@
+defineTest(qtFlattenResources) {
+    RESOURCES += qmake_immediate
+    for(resource, RESOURCES) {
+        # Regular case of user qrc file
+        contains(resource, ".*\\.qrc$"): \
+            next()
+
+        # Fallback for stand-alone files/directories
+        !defined($${resource}.files, var) {
+            !equals(resource, qmake_immediate) {
+                !exists($$absolute_path($$resource, $$_PRO_FILE_PWD_)): \
+                    warning("Failure to find: $$resource")
+                qmake_immediate.files += $$resource
+                OTHER_FILES *= $$resource
+            }
+            RESOURCES -= $$resource
+            next()
+        }
+
+        resource_file = $$absolute_path($$RCC_DIR/qmake_$${resource}.qrc, $$OUT_PWD)
+
+        isEmpty(BUILDS)|build_pass {
+            # Collection of files, generate qrc file
+            prefix = $$eval($${resource}.prefix)
+            isEmpty(prefix): \
+                prefix = "/"
+
+            resource_file_content = \
+                "<!DOCTYPE RCC><RCC version=\"1.0\">" \
+                "<qresource prefix=\"$$xml_escape($$prefix)\">"
+
+            abs_base = $$absolute_path($$eval($${resource}.base), $$_PRO_FILE_PWD_)
+
+            for(file, $${resource}.files) {
+                abs_path = $$absolute_path($$file, $$_PRO_FILE_PWD_)
+                files = $$files($$abs_path/*, true)
+                isEmpty(files): \
+                    files = $$abs_path
+                for (file, files) {
+                    exists($$file/*): next()  # exclude directories
+                    alias = $$relative_path($$file, $$abs_base)
+                    resource_file_content += \
+                        "<file alias=\"$$xml_escape($$alias)\">$$xml_escape($$file)</file>"
+                    OTHER_FILES *= $$file
+                }
+            }
+
+            resource_file_content += \
+                "</qresource>" \
+                "</RCC>"
+
+            !write_file($$resource_file, resource_file_content): \
+                error()
+        }
+
+        RESOURCES -= $$resource
+        RESOURCES += $$resource_file
+    }
+    export(RESOURCES)
+    export(OTHER_FILES)
+    export(qmake_immediate.files)
+    return(true)
+}