The include of <sys/types.h> from <stddef.h> seems risky, given that that's a POSIX header that typically defines various types ISO C does not permit to be defined in <stddef.h> (ISO C does not have any general *_t namespace reservation, unlike POSIX).
Have you verified that if you include <stddef.h> with -std=c90 / -std=c99 / -std=c11, the resulting definitions (compiler and preprocessor) are all ones permitted by the relevant C standard version to be provided by <stddef.h>? (I don't know what the FreeBSD <sys/_types.h> defines, but it at least seems possible from the name that it is only defining things in the implementation namespace, with the public <sys/types.h> being what then includes <sys/_types.h> and does "typedef __foo_t foo_t;" or similar to provide the public POSIX types that aren't in ISO C.) -- Joseph S. Myers jos...@codesourcery.com
