Make ament_include_directories_order a function to allow paths with backslashes on windows. (#371)

* Repalce backslashes with forward slashes on Windows

Signed-off-by: Shane Loretz <[email protected]>

* Typo

Signed-off-by: Shane Loretz <[email protected]>

* Replace slashes in ARGN

Signed-off-by: Shane Loretz <[email protected]>

* Don't quote

Signed-off-by: Shane Loretz <[email protected]>

* Check ARGN has values before trying to string(REPLACE them

Signed-off-by: Shane Loretz <[email protected]>

* Make ament_include_directories_order a function

Signed-off-by: Shane Loretz <[email protected]>

Author: sloretz

ament_cmake_include_directories/cmake/ament_include_directories_order.cmake

@@ -22,16 +22,12 @@
 #
 # @public
 #
-macro(ament_include_directories_order var)
-  set(_ament_prefix_path_list "$ENV{AMENT_PREFIX_PATH}")
+function(ament_include_directories_order var)
+  set(prefixes "$ENV{AMENT_PREFIX_PATH}")
   if(NOT WIN32)
-    string(REPLACE ":" ";" _ament_prefix_path_list "${_ament_prefix_path_list}")
+    string(REPLACE ":" ";" prefixes "${prefixes}")
   endif()
-  _ament_include_directories_order(${var} "${_ament_prefix_path_list}" ${ARGN})
-endmacro()
 
-
-function(_ament_include_directories_order var prefixes)
   # create list of empty slots, one per prefix and one for unknown prefixes
   list(LENGTH prefixes prefix_count)
   foreach(index RANGE ${prefix_count})