Path: utzoo!mnetor!tmsoft!torsqnt!news-server.csri.toronto.edu!cs.utexas.edu!uunet!mcsun!ukc!cam-cl!news
From: rjb17@ely.cl.cam.ac.uk (Richard Black)
Newsgroups: comp.sys.acorn
Subject: Re: Languages
Message-ID: <1991Feb13.100325.28239@cl.cam.ac.uk>
Date: 13 Feb 91 10:03:25 GMT
Sender: news@cl.cam.ac.uk (The news facility)
Reply-To: rjb17@ely.cl.cam.ac.uk (Richard Black)
Lines: 59

In article <1991Feb11.105227.15182@and.cs.liv.ac.uk>
rkl@and.cs.liv.ac.uk writes:

> I was dabbling in C on our HP UNIX boxes a while back and I was shocked at
> the complete lack of warning about the following:
>
> hello(param1,param2)
> int param1,param2;
> {
>    printf("Param 2 = %d\n",param2);
> }
>
> main()
> {
>    hello(1);
> }
> 
> Yes folks, I forgot a parameter and THERE WAS NOT EVEN A WARNING FROM THE
> COMPILER !

There should not be a warning from the compiler. It is a K&R compiler not
an ANSI compiler. Besides which you have deliveratly used a K&R style
definition. Even "gcc - Wall -pedantic" gives

acorn.c: In function hello:
acorn.c:2: warning: return-type defaults to `int'
acorn.c:4: warning: implicit declaration of function `printf'
acorn.c:5: warning: control reaches end of non-void function
acorn.c: In function main:
acorn.c:8: warning: return-type defaults to `int'
acorn.c:10: warning: control reaches end of non-void function

And doesn't warn of the incorrect number of parameters. This is correct
K&R behaviour.

> I put it through lint too and NO WARNING AGAIN !

Really? Transcript follows...

--/Nfs/forties/usr14/rjb17 $ arch
hp9000s300
--/Nfs/forties/usr14/rjb17 $ lint acorn.c

acorn.c
==============
(10)  warning: main() returns random value to invocation environment
warning: argument unused in function:
    (2)  param1 in hello


==============
function called with variable number of arguments
    hello       acorn.c(3) :: acorn.c(9)
function returns value which is always ignored
    printf

What did you do, lint > /dev/null or something?

R.