Merge branch 'issue/rst-configure-file' into 'master'

Do not configure non-template rst files

See merge request !1300

CHANGELOG.md

@@ -58,6 +58,10 @@ In order to build the DUNE core modules you need at least the following software
 
 ## Build System
 
+- Documentation files in `doc/buildsystem/${ModuleName}.rst` are now only copied.
+  Previously, they were configured through the CMake function `configure_file()`
+  as a cmake template file.
+
 - Try to find SuiteSparse during configuration.
 
 - The function `dune_add_library(<lib> ...)` now requires to provide `EXPORT_NAME` or `NO_EXPORT`.

cmake/modules/DuneSphinxCMakeDoc.cmake

@@ -131,7 +131,7 @@ function(dune_cmake_sphinx_doc)
       # add it to index.rst then.
       set(CMAKE_DOC_DEPENDENCIES "${CMAKE_DOC_DEPENDENCIES}   ${dep}\n")
       # ... and copy the rst file to the current build.
-      configure_file(${RSTFILE} ${CMAKE_CURRENT_BINARY_DIR}/${dep}.rst)
+      configure_file(${RSTFILE} ${CMAKE_CURRENT_BINARY_DIR}/${dep}.rst COPYONLY)
     endif()
   endforeach()