Merge pull request #15 from ros2/cmake35

require CMake 3.5

Author: dirk-thomas

rmw_implementation/CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 2.8.3)
+cmake_minimum_required(VERSION 3.5)
 
 # must be not NONE since some rmw implementation require compiler checks
 project(rmw_implementation)

rmw_implementation/rmw_implementation-extras.cmake.in

@@ -17,7 +17,7 @@
 find_package(rmw_implementation_cmake REQUIRED)
 set(default_rmw_implementation "@RMW_IMPLEMENTATION@")
 
-if(NOT "${RMW_IMPLEMENTATION} " STREQUAL " ")
+if(NOT "${RMW_IMPLEMENTATION}" STREQUAL "")
   set(requested_default_rmw_implementation ${RMW_IMPLEMENTATION})
   if(NOT requested_default_rmw_implementation STREQUAL default_rmw_implementation)
     message(FATAL_ERROR
@@ -29,7 +29,7 @@ if(NOT "${RMW_IMPLEMENTATION} " STREQUAL " ")
   endif()
 endif()
 
-if(NOT "$ENV{RMW_IMPLEMENTATION} " STREQUAL " ")
+if(NOT "$ENV{RMW_IMPLEMENTATION}" STREQUAL "")
   set(requested_default_rmw_implementation $ENV{RMW_IMPLEMENTATION})
   if(NOT requested_default_rmw_implementation STREQUAL default_rmw_implementation)
     message(FATAL_ERROR