Bruno Haible <br...@clisp.org> writes:
> According to my understanding of C99,
> - foo() as a function _definition_ defines a function with 0 arguments,
> not with varargs. (Things are different for a function _declaration_
> without a body.)
Yes.
> - There is no reason for GCC to warn about foo().
Probably Eric is using -Wstrict-prototypes:
`-Wstrict-prototypes (C and Objective-C only)'
Warn if a function is declared or defined without specifying the
argument types. (An old-style function definition is permitted
without a warning if preceded by a declaration which specifies the
argument types.)
-Wstrict-prototypes is useful for finding foo()-style
declarations (especially in header files) to remind the
programmer to change them to foo(void) prototypes, so that
callers cannot inadvertently invoke them with one or more
arguments.
-Wstrict-prototypes is less useful for the main function, since
it is rarely invoked directly by other program code.
--
Ben Pfaff
http://benpfaff.org
