[cmake] switch to standard deal.II finding method

closes #20

Author: renefritze

CMakeLists.txt

@@ -6,7 +6,18 @@ set(CMAKE_CXX_STANDARD 17 CACHE STRING "")
 project(pymor_dealii)
 
 set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} ${CMAKE_CURRENT_SOURCE_DIR}/lib)
-INCLUDE(dealii_macro)
+
+FIND_PACKAGE(deal.II 9.3
+  HINTS ${deal.II_DIR} ${DEAL_II_DIR} ../ ../../ $ENV{DEAL_II_DIR}
+  )
+IF(NOT ${deal.II_FOUND})
+  MESSAGE(FATAL_ERROR "\n"
+    "*** Could not locate deal.II. ***\n\n"
+    "You may want to either pass a flag -DDEAL_II_DIR=/path/to/deal.II to cmake\n"
+    "or set an environment variable \"DEAL_II_DIR\" that contains this path."
+    )
+ENDIF()
+
 # Set a default build configuration if none is specified. 'MinSizeRel' produces the smallest binaries
 if(NOT CMAKE_BUILD_TYPE AND NOT CMAKE_CONFIGURATION_TYPES)
   message(STATUS "Setting build type to 'RelWithDebInfo' as none was specified.")

lib/CMakeLists.txt

@@ -1,7 +1,6 @@
 cmake_minimum_required(VERSION 2.8.12)
 add_subdirectory(pybind11)
 
-FIND_PACKAGE(deal.II 9.2 HINTS ${deal.II_DIR} ${DEAL_II_DIR} CONFIG REQUIRED)
 INCLUDE(dealii_macro)
 DEAL_II_INITIALIZE_CACHED_VARIABLES()