Bruno Haible <bruno <at> clisp.org> writes: > > +verify (sizeof NULL == sizeof (void *)); > > Citing <https://savannah.gnu.org/support/?106973>: > > on NetBSD 5.0 amd64, test-locale.c fails to build > because the call to verify says "sizeof NULL". On NetBSD, NULL is "(void > *)0", and gcc fails to parse "sizeof (void*)0". Changing this to "sizeof > (NULL)" makes the tests compile > > Indeed, "sizeof (void*)0" parses as sizeof of the type 'void *', followed by a > stray 0 token => parse error.
I argue that NetBSD's definition of NULL is thus buggy, and that we should add a gnulib check and config.h workaround for it. POSIX requires: "The macro shall expand to an integer constant expression with the value 0 cast to type void *." which implies to me that I should be able to use NULL without having to add extra parenthesis myself. -- Eric Blake
