simplified/improved codegenerator cmake script

cmake/modules/Codegen.cmake

-function(add_code_generate_targets _target)
+function(add_code_generate_targets)
 
-  get_target_property( compiledefs ${_target} COMPILE_DEFINITIONS )
-  string(REPLACE "compiledefs-NOTFOUND" "" compiledefs "${compiledefs}")
+  foreach(_target ${ARGN})
+    #check whether targets are already set up correctly
+    if( TARGET ${_target} )
+      #obtain compile definitions
+      get_target_property( compiledefs ${_target} COMPILE_DEFINITIONS )
+      string(REPLACE "compiledefs-NOTFOUND" "" compiledefs "${compiledefs}")
+      
+      #optain sources target depends on
+      get_target_property( compilesources ${_target} SOURCES )
+      string(REPLACE "compilesources-NOTFOUND" "" compilesources "${compilesources}")
 
-  #Add targets and executables
-  add_executable( ${_target}_generatecode ${ARGN} )
-  set_property(TARGET ${_target}_generatecode APPEND PROPERTY COMPILE_DEFINITIONS "NDEBUG;BASEFUNCTIONSET_CODEGEN_GENERATE;${compiledefs}")
-  dune_target_link_libraries( ${_target}_generatecode "${DUNE_LIBS}" )
+      #Add targets and executables
+      add_executable( ${_target}_generatecode ${compilesources} )
+      set_property(TARGET ${_target}_generatecode APPEND PROPERTY COMPILE_DEFINITIONS "NDEBUG;BASEFUNCTIONSET_CODEGEN_GENERATE;${compiledefs}")
+      dune_target_link_libraries( ${_target}_generatecode "${DUNE_LIBS}" )
 
-  add_executable( ${_target}_compilecode ${ARGN} )
-  set_property(TARGET ${_target}_compilecode APPEND PROPERTY COMPILE_DEFINITIONS "NUSE_BASEFUNCTIONSET_CODEGEN;${compiledefs}")
-  dune_target_link_libraries( ${_target}_compilecode "${DUNE_LIBS}" )
+      add_executable( ${_target}_compilecode ${compilesources} )
+      set_property(TARGET ${_target}_compilecode APPEND PROPERTY COMPILE_DEFINITIONS "NUSE_BASEFUNCTIONSET_CODEGEN;${compiledefs}")
+      dune_target_link_libraries( ${_target}_compilecode "${DUNE_LIBS}" )
 
-  add_custom_target( ${_target}_generate 
-    ${CMAKE_COMMAND} -D RUN_CODEGEN_PROGRAM=${CMAKE_CURRENT_BINARY_DIR}/${_target}_generatecode -D RUN_CODEGEN_PARAMFILE="" -P ${CMAKE_SOURCE_DIR}/cmake/scripts/RunGenerate.cmake ) 
-  
-  add_custom_target( ${_target}_codegen )
+      add_custom_target( ${_target}_generate 
+        ${CMAKE_COMMAND} -D RUN_CODEGEN_PROGRAM=${CMAKE_CURRENT_BINARY_DIR}/${_target}_generatecode -D RUN_CODEGEN_PARAMFILE="" -P ${CMAKE_SOURCE_DIR}/cmake/scripts/RunGenerate.cmake ) 
+      
+      add_custom_target( ${_target}_codegen )
 
-  #Add depenencies  
-  add_dependencies( ${_target}_generate ${_target}_generatecode )
-  add_dependencies( ${_target}_compilecode ${_target}_generate )
-  add_dependencies( ${_target}_codegen ${_target}_compilecode )
+      #Add depenencies  
+      add_dependencies( ${_target}_generate ${_target}_generatecode )
+      add_dependencies( ${_target}_compilecode ${_target}_generate )
+      add_dependencies( ${_target}_codegen ${_target}_compilecode )
+    endif()
+  endforeach()
 
 endfunction(add_code_generate_targets _target)

dune/fem-dg/test/advdiff/CMakeLists.txt

@@ -18,7 +18,6 @@ dune_target_link_libraries(advdiff "${DUNE_LIBS}")
 set_property(TARGET advdiff APPEND PROPERTY 
              COMPILE_DEFINITIONS "ONLY_ONE_P;POLORDER=2")
 
-add_code_generate_targets( advdiff main.cc )
-add_code_generate_targets( advdiffall main.cc )
+add_code_generate_targets( advdiff advdiffall )
 
 dune_add_test( advdiff advdiffall )

dune/fem-dg/test/euler/CMakeLists.txt

@@ -20,4 +20,6 @@ dune_target_link_libraries(euler ${DUNE_LIBS})
 set_property(TARGET euler APPEND PROPERTY 
              COMPILE_DEFINITIONS "ONLY_ONE_P;POLORDER=${POLORDER}")
 
+add_code_generate_targets( euler eulerall )
+
 dune_add_test( euler eulerall )

dune/fem-dg/test/navierstokes/CMakeLists.txt

@@ -19,4 +19,6 @@ dune_target_link_libraries(navierstokes ${DUNE_LIBS})
 set_property(TARGET navierstokes APPEND PROPERTY 
              COMPILE_DEFINITIONS "ONLY_ONE_P;POLORDER=${POLORDER}")
 
+add_code_generate_targets( navierstokes navierstokesall )
+
 dune_add_test( navierstokes navierstokesall )

dune/fem-dg/test/poisson/CMakeLists.txt

@@ -21,4 +21,6 @@ dune_target_link_libraries(poisson ${DUNE_LIBS})
 set_property(TARGET poisson APPEND PROPERTY 
              COMPILE_DEFINITIONS "ONLY_ONE_P;POLORDER=${POLORDER}")
 
+add_code_generate_targets( poisson poissonall )
+
 dune_add_test( poisson poissonall )

dune/fem-dg/test/stokes/CMakeLists.txt

@@ -21,4 +21,6 @@ dune_target_link_libraries(stokes "${DUNE_LIBS}")
 set_property(TARGET stokes APPEND PROPERTY 
              COMPILE_DEFINITIONS "ONLY_ONE_P;POLORDER=2")
 
+add_code_generate_targets( stokes stokesall )
+
 dune_add_test( stokes stokesall )