Travis: Add Clang UBSan build configuration

.travis.sh

@@ -26,6 +26,10 @@ function generate()
         OPTIONS="$OPTIONS -DASSIMP_ASAN=OFF"
     fi
 
+    if [ "$UBSAN" = "ON" ] ; then
+        OPTIONS="$OPTIONS -DASSIMP_UBSAN=ON"
+    fi
+
     cmake -G "Unix Makefiles" $OPTIONS
 }
 

.travis.yml

@@ -46,6 +46,9 @@ matrix:
     - os: linux
       compiler: clang
       env: ASAN=ON
+    - os: linux
+      compiler: clang
+      env: UBSAN=ON
     - os: linux
       compiler: clang
       env: SHARED_BUILD=ON