Fix CMake error when entire ament projects are added via add_subdirectory (#484)

Signed-off-by: Silvio Traversaro <[email protected]>

Author: traversaro

ament_cmake_core/cmake/environment_hooks/ament_environment_hooks.cmake

@@ -82,7 +82,7 @@ function(ament_environment_hooks)
     get_filename_component(hook_basename "${hook}" NAME_WE)
     if(DEFINED AMENT_CMAKE_ENVIRONMENT_HOOKS_DESC_${hook_basename})
       # write .dsv file containing the descriptor of the environment hook
-      set(dsv_file "${CMAKE_BINARY_DIR}/ament_cmake_environment_hooks/${hook_basename}.dsv")
+      set(dsv_file "${CMAKE_CURRENT_BINARY_DIR}/ament_cmake_environment_hooks/${hook_basename}.dsv")
       file(GENERATE OUTPUT "${dsv_file}" CONTENT "${AMENT_CMAKE_ENVIRONMENT_HOOKS_DESC_${hook_basename}}\n")
       install(
         FILES "${dsv_file}"

ament_cmake_core/cmake/environment_hooks/ament_generate_package_environment.cmake

@@ -102,7 +102,7 @@ function(ament_generate_package_environment)
     endforeach()
   endif()
   list(APPEND all_package_level_extensions "dsv")
-  set(dsv_file "${CMAKE_BINARY_DIR}/ament_cmake_environment_hooks/local_setup.dsv")
+  set(dsv_file "${CMAKE_CURRENT_BINARY_DIR}/ament_cmake_environment_hooks/local_setup.dsv")
   file(GENERATE OUTPUT "${dsv_file}" CONTENT "${all_hooks}")
   install(
     FILES "${dsv_file}"
@@ -111,7 +111,7 @@ function(ament_generate_package_environment)
 
   # generate package.dsv file
   list(SORT all_package_level_extensions)
-  set(dsv_file "${CMAKE_BINARY_DIR}/ament_cmake_environment_hooks/package.dsv")
+  set(dsv_file "${CMAKE_CURRENT_BINARY_DIR}/ament_cmake_environment_hooks/package.dsv")
   set(dsv_content "")
   foreach(ext ${all_package_level_extensions})
     set(dsv_content "${dsv_content}source;share/${PROJECT_NAME}/local_setup.${ext}\n")