Convert qt3d to the new configure system

Remove some duplicated code between the assimp test and
assimp_dependency.pri and do all pkg-config related tests
during config time.

Change-Id: If97c4cf53cd0356e7ee4e618a8d645ea697b3dfc
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@qt.io>

config.tests/assimp/assimp.pro

@@ -1,8 +1 @@
 SOURCES += main.cpp
-
-unix:qtConfig(pkg-config) {
-    CONFIG += link_pkgconfig
-    PKGCONFIG += assimp
-} else {
-    LIBS += -lassimp
-}

configure.json

@@ -0,0 +1,5 @@
+{
+    "subconfigs": [
+        "src/core"
+    ]
+}

qt3d.pro

@@ -1,8 +1,5 @@
 requires(qtConfig(opengl))
 
-load(configure)
-qtCompileTest(assimp)
-
 CONFIG += examples_need_tools
 load(qt_parts)
 

src/3rdparty/assimp/assimp_dependency.pri

@@ -1,11 +1,6 @@
-config_assimp:!if(cross_compile:host_build) {
-    unix:qtConfig(pkg-config) {
-        CONFIG += link_pkgconfig
-        PKGCONFIG_PRIVATE += assimp
-    } else {
-        LIBS += -lassimp
-    }
-    return()
+QT_FOR_CONFIG += 3dcore-private
+qtConfig(system-assimp):!if(cross_compile:host_build) {
+    QMAKE_USE_PRIVATE += assimp
 } else {
     include(assimp.pri)
 }

src/core/configure.json

@@ -0,0 +1,35 @@
+{
+    "module": "3dcore",
+    "testDir": "../../config.tests",
+
+    "libraries": {
+        "assimp": {
+            "label": "Assimp",
+            "test": "assimp",
+            "sources": [
+                { "type": "pkgConfig", "args": "assimp" },
+                "-lassimp"
+            ]
+        }
+    },
+
+    "features": {
+        "system-assimp": {
+            "label": "System Assimp",
+            "condition": "libs.assimp",
+            "output": [ "privateFeature" ]
+        }
+    },
+
+    "report": [
+    ],
+
+    "summary": [
+        {
+            "section": "Qt 3D",
+            "entries": [
+                "system-assimp"
+            ]
+        }
+    ]
+}