initial sandbox version

modules/UseFortran.cmake

@@ -0,0 +1,15 @@
+enable_language(Fortran)
+
+set(CMAKE_Fortran_MODULE_DIRECTORY ${PROJECT_BINARY_DIR}/include/fortran)
+
+if(NOT DEFINED CMAKE_Fortran_COMPILER_ID)
+    message(FATAL_ERROR "CMAKE_Fortran_COMPILER_ID variable is not defined!")
+endif()
+
+if(NOT CMAKE_Fortran_COMPILER_WORKS)
+    message(FATAL_ERROR "CMAKE_Fortran_COMPILER_WORKS is false!")
+endif()
+
+if(DEFINED EXTRA_Fortran_FLAGS)
+    set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} ${EXTRA_Fortran_FLAGS}")
+endif()