empty source

CMakeLists.txt

@@ -490,8 +490,18 @@ add_library (glog_internal OBJECT
 target_compile_features (glog_internal PUBLIC $<TARGET_PROPERTY:glog,COMPILE_FEATURES>)
 set_target_properties (glog_internal PROPERTIES DEFINE_SYMBOL GOOGLE_GLOG_IS_A_DLL)
 
+# Some generators (such as Xcode) do not generate any output if the target does
+# not reference at least one source file.
+set (_glog_EMPTY_SOURCE ${glog_BINARY_DIR}/${CMAKE_FILES_DIRECTORY}/glog.cc)
+
+add_custom_command (
+  OUTPUT ${_glog_EMPTY_SOURCE}
+  COMMAND ${CMAKE_COMMAND} -E touch ${_glog_EMPTY_SOURCE}
+)
+
 add_library (glog
   $<TARGET_OBJECTS:glog_internal>
+  ${_glog_EMPTY_SOURCE}
 )
 target_compile_features (glog PUBLIC cxx_std_14)