centralize + fix use of system assimp

follow the foo.pri & foo_dependency.pri pattern found in qtbase to
de-duplicate the code (and thus implicitly make it consistent) and
synchronize the conditionals in the configure test.

also document why we still can't enable the assimp sceneparser in all
configurations.

Change-Id: I3bdc30e077b6c9c7027a9311195c08a6c5f1fcf4
Reviewed-by: Joerg Bornemann <joerg.bornemann@theqtcompany.com>

1 files changed, 11 insertions, 0 deletions

diff --git a/src/3rdparty/assimp/assimp_dependency.pri b/src/3rdparty/assimp/assimp_dependency.pri
new file mode 100644
index 000000000..4fe0df54e
--- /dev/null
+++ b/src/3rdparty/assimp/assimp_dependency.pri
@@ -0,0 +1,11 @@
+config_assimp:!if(cross_compile:host_build) {
+    unix:!contains(QT_CONFIG, no-pkg-config) {
+        CONFIG += link_pkgconfig
+        PKGCONFIG_PRIVATE += assimp
+    } else {
+        LIBS += -lassimp
+    }
+    return()
+} else {
+    include(assimp.pri)
+}