cmake: create symlink instead of copies

examples/CMakeLists.txt

@@ -23,16 +23,8 @@ mtime_add_example(example example.f90)
 add_library(event_manager OBJECT mo_event_manager.f90)
 target_link_libraries(event_manager PRIVATE mtime::mtime)
 
-file(
-  COPY "${CMAKE_CURRENT_SOURCE_DIR}/iconatm.nml"
-  DESTINATION "${CMAKE_CURRENT_BINARY_DIR}"
-)
 mtime_add_example(iconatm iconatm.f90 DEPENDS $<TARGET_OBJECTS:event_manager>)
 
-file(
-  COPY "${CMAKE_CURRENT_SOURCE_DIR}/iconoce.nml"
-  DESTINATION "${CMAKE_CURRENT_BINARY_DIR}"
-)
 mtime_add_example(iconoce iconoce.f90 DEPENDS $<TARGET_OBJECTS:event_manager>)
 
 mtime_add_example(model_integration model_integration.c)
@@ -64,3 +56,14 @@ if(MT_ENABLE_FORTRAN_HL)
 
   mtime_add_example(simulate_iau simulate_iau.f90)
 endif()
+
+foreach(namelist IN ITEMS iconatm.nml iconoce.nml)
+  file(
+    CREATE_LINK
+    ${CMAKE_CURRENT_SOURCE_DIR}/${namelist}
+    ${CMAKE_CURRENT_BINARY_DIR}/${namelist}
+    RESULT
+      dummy # just don't fail if something goes wrong (e.g. building in-source)
+    COPY_ON_ERROR SYMBOLIC
+  )
+endforeach()