[lug] [OT] more gcc queries

[Daniel Webb]

On Sun, Oct 10, 2004 at 07:50:03PM -0600, Daniel Webb wrote:

> #include<stdbool.h>
> void f(bool d);
> 
> int main(void)
> {
>   bool b = false;
>   f(b);
>   return 1;
> }
> 
> $ gcc -c -Wconversion test.c
> test.c: In function `main':
> test.c:8: warning: passing arg 1 of `f' with different width due to prototype
> $
> 
> Why?  The reference I'm using ("Expert C Programming" by var der Linden),
> says: "In ANSI C, arguments are not promoted if a prototype is used; otherwise
> they are."

(replying to myself)

I see that -Wconvert is actually talking about giving warnings if you do
anything different than the default type promotions.  So I still have the
problem: how can I get it to warn me about sending a float in a parameter that
should be char and so on?  The -Wconvert option seems to be made for people
who are converting K&R C to ANSI C, since K&R C always does type promotion on
function arguments, while ANSI C doesn't.

Can someone back me up, that gcc used to warn about mixing argument types
without the extra silly stuff given by the -Wconvert option?

Why isn't this option default any more?  What is the point of prototyping if
your compiler doesn't tell you when you're going against the prototype?

Daniel