Add FindEnet.cmake for enet examples.

Author: rcorre

cmake/FindENet.cmake

@@ -0,0 +1,29 @@
+# - Find ENet
+# Find the native ENet includes and libraries
+#
+#  ENET_INCLUDE_DIR - where to find ENet headers.
+#  ENET_LIBRARIES   - List of libraries when using libenet.
+#  ENET_FOUND       - True if libenet found.
+
+if(ENET_INCLUDE_DIR)
+    # Already in cache, be silent
+    set(ENET_FIND_QUIETLY TRUE)
+endif(ENET_INCLUDE_DIR)
+
+find_path(ENET_INCLUDE_DIR enet/enet.h)
+
+find_library(ENET_LIBRARY NAMES enet enet_static libenet libenet_static)
+
+# Handle the QUIETLY and REQUIRED arguments and set ENET_FOUND to TRUE if
+# all listed variables are TRUE.
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(ENET DEFAULT_MSG
+    ENET_INCLUDE_DIR ENET_LIBRARY)
+
+if(ENET_FOUND)
+  set(ENET_LIBRARIES ${ENET_LIBRARY})
+else(ENET_FOUND)
+  set(ENET_LIBRARIES)
+endif(ENET_FOUND)
+
+mark_as_advanced(ENET_INCLUDE_DIR ENET_LIBRARY)

examples/CMakeLists.txt

@@ -245,13 +245,12 @@ if(WANT_CURL_EXAMPLE)
     endif(CURL_FOUND)
 endif(WANT_CURL_EXAMPLE)
 
-# The enet example won't compile if the enet library isn't available.
-# This example isn't important so it's disabled by default to prevent problems.
-option(WANT_ENET_EXAMPLE "Build ex_enet example" off)
-if(WANT_ENET_EXAMPLE)
-    example(ex_enet_client -lenet ${PRIM})
-    example(ex_enet_server -lenet)
-endif(WANT_ENET_EXAMPLE)
+# Only build the enet examples if libenet is installed
+find_package(ENet)
+if(ENET_FOUND)
+    example(ex_enet_client ${ENET_LIBRARIES} ${PRIM})
+    example(ex_enet_server ${ENET_LIBRARIES})
+endif(ENET_FOUND)
 
 # example(ex_ogre3d ex_ogre3d.cpp)
 # include_directories(/usr/include/OGRE)