There has got to be a better way to deal with bitfields in C

I just encountered a problem involving this MacOS header file: typedef struct { natural_t pad1; mach_msg_size_t pad2; unsigned int pad3 : 24; mach_msg_descriptor_type_t type : 8; } mach_msg_type_descriptor_t; xnu_static_assert_struct_size(mach_msg_type_descriptor_t, 12); After translation, the code becomes: // /home/cleong/.zvm/0.16.0/lib/libc/include/any-darwin-any/mach/message.h:296:32: warning: struct demoted to opaque type - has bi...