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Joseph Myers
authored
We don't yet have clear agreement on removing -Wtraditional (although it seems there is little to no use for most of the warnings therein), so fix the bug in its interaction with -std=gnu23 to continue progress on making -std=gnu23 the default while -Wtraditional remains under discussion. The warning for ISO C function definitions with -Wtraditional properly covers (void), but also wrongly warned for () in C23 mode as that has the same semantics as (void) in that case. Keep track in c_arg_info of when () was converted to (void) for C23 so that -Wtraditional can avoid warning in that case (with an appropriate comment on the definition of the new field to make clear it can be removed along with -Wtraditional). Bootstrapped with no regressions for x86_64-pc-linux-gnu. gcc/c/ * c-tree.h (c_arg_info): Add c23_empty_parens. * c-decl.cc (grokparms): Set c23_empty_parens. (build_arg_info): Clear c23_empty_parens. (store_parm_decls_newstyle): Do not give -Wtraditional warning for ISO C function definition if c23_empty_parens. gcc/testsuite/ * gcc.dg/wtr-gnu17-1.c, gcc.dg/wtr-gnu23-1.c: New tests.