[cmake] Fix broken input file links

It was checked in add_dumux_test whether the to be linked input file exists
but then another file was linked in some occations. 
Use the path relative to the source directory to fix the broken links.


git-svn-id: svn://svn.iws.uni-stuttgart.de/DUMUX/dumux/trunk@15326 2fb0f335-1f38-0410-981e-8018bf24f1b0

cmake/modules/DumuxTestMacros.cmake

@@ -13,20 +13,22 @@
 # - further arguments:            are optional and are used as arguments for calling the test
 ###
 macro(add_dumux_test dumux_test dumux_test_executable dumux_test_executable_source)
-  # if present, copy grids folder
+  # if present, symlink the grids folder
   set(grids_directory ${CMAKE_CURRENT_SOURCE_DIR}/grids)
   if(EXISTS ${grids_directory} AND IS_DIRECTORY ${grids_directory})
     dune_symlink_to_source_files(FILES grids)
   endif()
 
-  # if present, copy input file
+  # if present, symlink the input file
   set(input_file ${CMAKE_CURRENT_SOURCE_DIR}/${dumux_test_executable}.input)
   if(NOT EXISTS ${input_file})
     get_filename_component(base_source_name ${dumux_test_executable_source} NAME_WE)
     set(input_file ${CMAKE_CURRENT_SOURCE_DIR}/${base_source_name}.input)
   endif()
   if(EXISTS ${input_file})
-    dune_symlink_to_source_files(FILES "${dumux_test_executable}.input")
+    # dune symlink takes a path relative to the source directory
+    get_filename_component(input_file ${input_file} NAME_WE)
+    dune_symlink_to_source_files(FILES ${input_file}.input)
   endif()
 
   # add executable