> > Vincent Lefevre <[email protected]> wrote:
> > > Is there any reason why tcc hasn't rejected the code because the
> > > prototype wasn't declared?
> >
> > Because C default declares functions for you. It's as if it was
> > declared
> >
> > int atan2(...);
>
> But I don't think that an implementation is disallowed to reject the
> code. As I read the standard, the library functions are specified only
> when the corresponding header is included. So, if the header is not
> included, the implementation could complain that it doesn't know the
> function.
C++ does reject the call. C is much more permissive. Try
$ cat > hello.c
int main() { printf("hello, world\n"); return 0; }
^D
Note that there's no include of <stdio.h>, yet the program compiles
and runs just fine, much as you'd expect it to. Since K&R, when C
sees a call of a function which has not been declared, it treats as
extern int foo(...);
I think, but am not sure, that C11 tightens this up.
Arnold
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