With clang 15, the following -Werror warning is produced: stand/i386/boot2/boot2.c:358:6: error: a function declaration without a prototype is deprecated in all versions of C [-Werror,-Wstrict-prototypes] This is because parse() is declared with a (void) argument list, and defined with an empty argument list. Make the definition match the declaration. MFC after: 3 days