Made OpenVolumeMesh be ready to be built as external library.

git-svn-id: http://www.openvolumemesh.org/svnrepo/OpenVolumeMesh/trunk@86 66977474-1d4b-4f09-8fe9-267525286df2

CMakeLists.txt

 cmake_minimum_required (VERSION 2.6)
 
-project (OpenVolumeMesh)
+if("${PROJECT_NAME}" STREQUAL "")
+    message("Setting project name to OpenVolumeMesh")
+    project (OpenVolumeMesh)
+endif()
 
 # add our macro directory to cmake search path
 set (CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} ${CMAKE_SOURCE_DIR}/cmake)
@@ -23,8 +26,13 @@ endif ()
 # ========================================================================
 
 add_subdirectory (src)
-add_subdirectory (examples)
-add_subdirectory (documentation)
+
+# Only add examples and doc to build target if OpenVolumeMesh
+# is not built as external library only
+if(${PROJECT_NAME} MATCHES "OpenVolumeMesh")
+    add_subdirectory (examples)
+    add_subdirectory (documentation)
+endif()
 
 # ========================================================================
 # Bundle generation (Targets exist, now configure them)

src/CMakeLists.txt

@@ -64,7 +64,10 @@ install(DIRECTORY .
 
 endif ()
 
-# Add unittests target
-add_subdirectory(Unittests)
+# Only build unittests if not built as external library
+if(${PROJECT_NAME} MATCHES "OpenVolumeMesh")
+    # Add unittests target
+    add_subdirectory(Unittests)
+endif()