Use an object library to build shared and static libraries

CMakeLists.txt

@@ -18,43 +18,43 @@ configure_file(
   @ONLY
 )
 
-# Create static and shared libraries.
-set(static_lib ${CMAKE_PROJECT_NAME}_static)
+# Create shared and static libraries through an object library.
 set(shared_lib ${CMAKE_PROJECT_NAME}_shared)
-add_library(${static_lib} bmi.f90)
-add_library(${shared_lib} SHARED bmi.f90)
-
-# Change the output names of the libraries. On Windows, they can't
-# have the same name, so change the shared library name.
-set_target_properties(${static_lib} PROPERTIES
-  OUTPUT_NAME ${CMAKE_PROJECT_NAME})
-if(WIN32)
-  set_target_properties(${shared_lib} PROPERTIES
-    OUTPUT_NAME ${CMAKE_PROJECT_NAME}_win)
-else()
-  set_target_properties(${shared_lib} PROPERTIES
-    OUTPUT_NAME ${CMAKE_PROJECT_NAME})
-endif()
+set(static_lib ${CMAKE_PROJECT_NAME}_static)
+add_library(obj_lib OBJECT bmi.f90)
+add_library(${shared_lib} SHARED $<TARGET_OBJECTS:obj_lib>)
+add_library(${static_lib} STATIC $<TARGET_OBJECTS:obj_lib>)
 
-set_target_properties(${static_lib} PROPERTIES
-  VERSION ${CMAKE_PROJECT_VERSION}
-)
-set_target_properties(${shared_lib} PROPERTIES
+set_target_properties(${shared_lib}
+  PROPERTIES
+  OUTPUT_NAME ${CMAKE_PROJECT_NAME}
   VERSION ${CMAKE_PROJECT_VERSION}
   PUBLIC_HEADER ${CMAKE_BINARY_DIR}/${mod_name}.mod
 )
 
-install(
-  TARGETS ${static_lib}
-  ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
+set_target_properties(${static_lib}
+  PROPERTIES
+  OUTPUT_NAME ${CMAKE_PROJECT_NAME}
+  VERSION ${CMAKE_PROJECT_VERSION}
 )
+if(WIN32)
+  set_target_properties(${static_lib}
+    PROPERTIES
+    OUTPUT_NAME ${CMAKE_PROJECT_NAME}_static
+  )
+endif()
+
 install(
   TARGETS ${shared_lib}
   LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
   ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
   RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
   PUBLIC_HEADER DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
 )
+install(
+  TARGETS ${static_lib}
+  ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
+)
 install(
   FILES ${CMAKE_BINARY_DIR}/${CMAKE_PROJECT_NAME}.pc
   DESTINATION ${CMAKE_INSTALL_LIBDIR}/pkgconfig