Improve interaction when called as a CMake-subproject

Author: aradi

CMakeLists.txt

@@ -2,8 +2,6 @@ cmake_minimum_required(VERSION 3.5)
 
 project(libdftd3 VERSION 0.9.2 LANGUAGES Fortran)
 
-set(LIBRARY_ONLY FALSE CACHE BOOL "Whether only library should be compiled")
-
 option(BUILD_SHARED_LIBS "Whether the library should be a shared one" FALSE)
 
 option(INSTALL_INCLUDE_FILES "Whether include / module files should be installed" TRUE)

lib/CMakeLists.txt

@@ -11,10 +11,12 @@ set(includedir ${CMAKE_CURRENT_BINARY_DIR}/include)
 
 set_target_properties(dftd3 PROPERTIES Fortran_MODULE_DIRECTORY ${includedir})
 
-target_include_directories(dftd3 PUBLIC ${includedir})
+target_include_directories(dftd3 PUBLIC
+  $<BUILD_INTERFACE:${includedir}>
+  $<INSTALL_INTERFACE:${INSTALL_MOD_DIR}>)
 
 install(TARGETS dftd3
-  EXPORT dftd3-targets
+  EXPORT ${INSTALL_EXPORT_NAME}
   ARCHIVE DESTINATION ${INSTALL_LIB_DIR}
   LIBRARY DESTINATION ${INSTALL_LIB_DIR})