CMake fixes:

   - Add the option to build static or shared library
   - Fixed make install

Author: bourdin

CMakeLists.txt

@@ -1,6 +1,8 @@
 cmake_minimum_required(VERSION 2.8)
 enable_language(C Fortran)
 project(symengine.f90)
+set (CMAKE_Fortran_MODULE_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}/mod")
+option(BUILD_SHARED_LIBS "Build using shared libraries" ON)
 
 set(CMAKE_PREFIX_PATH ${SymEngine_DIR} ${CMAKE_PREFIX_PATH})
 find_package(SymEngine 0.3.0 REQUIRED CONFIG
@@ -11,7 +13,8 @@ set(CMAKE_CXX_FLAGS_RELEASE ${SYMENGINE_CXX_FLAGS_RELEASE})
 set(CMAKE_CXX_FLAGS_DEBUG ${SYMENGINE_CXX_FLAGS_DEBUG})
 include_directories(${SYMENGINE_INCLUDE_DIRS})
 
-set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_CURRENT_SOURCE_DIR}/cmake/")
+set(CMAKE_Fortran_MODULE_DIRECTORY ${CMAKE_BINARY_DIR}/mod_files)
+install(DIRECTORY ${CMAKE_Fortran_MODULE_DIRECTORY}/ DESTINATION include)
 
 if (MINGW AND ("${CMAKE_SIZEOF_VOID_P}" STREQUAL "8"))
     set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -DMS_WIN64")

src/CMakeLists.txt

@@ -13,3 +13,6 @@ set(SRC
     )
 add_library(symengine_f90 ${SRC})
 target_link_libraries(symengine_f90 ${SYMENGINE_LIBRARIES})
+
+install(TARGETS symengine_f90 DESTINATION lib)
+# install(TARGETS symengine_f90.mod DESTINATION include)