added check to add_amdis_executable that chosen Grid exists

cmake/modules/AddAmdisExecutable.cmake

@@ -104,11 +104,14 @@ function(add_amdis_executable)
 
   # add flags for AlbertaGrid
   if(ADDEXE_ALBERTA_GRID)
+    if (NOT ALBERTA_FOUND)
+      message(FATAL_ERROR "Alberta package required in order to set ALBERTA_GRID flag.")
+    endif ()
     if(NOT ADDEXE_DIM)
-      message(FATAL_ERROR "You need to specify dimension for ALBERTA_GRID!")
+      message(FATAL_ERROR "You need to specify dimension DIM for ALBERTA_GRID!")
     endif()
     if(NOT ADDEXE_DOW)
-      message(WARNING "dimensionworld not specified for ALBERTA_GRID. Setting DOW=DIM.")
+      message(WARNING "dimensionworld DOW not specified for ALBERTA_GRID. Setting DOW=DIM.")
     endif()
 
     add_dune_alberta_flags(GRIDDIM ${GRIDDIM} WORLDDIM ${WORLDDIM} ${ADDEXE_NAME})
@@ -116,6 +119,8 @@ function(add_amdis_executable)
 
   # add flags for ALUGrid
   if(ADDEXE_ALU_GRID)
-    # nothing special to do
+    if (NOT dune-alugrid_FOUND)
+      message(FATAL_ERROR "dune-alugrid package required in order to set ALU_GRID flag.")
+    endif ()
   endif(ADDEXE_ALU_GRID)
 endfunction(add_amdis_executable)
\ No newline at end of file

examples/CMakeLists.txt

@@ -18,15 +18,19 @@ add_amdis_executable(NAME stokes1.2d SOURCES stokes1.cc DIM 2 DOW 2)
 add_amdis_executable(NAME stokes3.2d SOURCES stokes3.cc DIM 2 DOW 2)
 add_amdis_executable(NAME navier_stokes.2d SOURCES navier_stokes.cc DIM 2 DOW 2)
 add_amdis_executable(NAME convection_diffusion.2d SOURCES convection_diffusion.cc DIM 2 DOW 2)
-add_amdis_executable(NAME cahn_hilliard.2d SOURCES cahn_hilliard.cc DIM 2 DOW 2 ALBERTA_GRID)
+
 add_dependencies(examples
   vecellipt.2d
   stokes0.2d
   stokes1.2d
   stokes3.2d
   navier_stokes.2d
-  convection_diffusion.2d
-  cahn_hilliard.2d)
+  convection_diffusion.2d)
+
+if (ALBERTA_FOUND)
+  add_amdis_executable(NAME cahn_hilliard.2d SOURCES cahn_hilliard.cc DIM 2 DOW 2 ALBERTA_GRID)
+  add_dependencies(examples cahn_hilliard.2d)
+endif ()
 
 if (dune-foamgrid_FOUND)
   add_amdis_executable(NAME surface.2d SOURCES surface.cc DIM 2 DOW 3 ALBERTA_GRID)