Hi,
I am using the C compiler with the maximum checking option I found, -A -w-
-r.
However, the compiler does not check the possible errors as I would like,
ie :
- I declared main() as returning a void, and the compiler did not complain.
- I declared a function returning an int, and I do not use return statement
in the function body. Again, the compiler does not complain.
- I use a function without declaring the prototype. The compiler says
nothing.

Is there a compiler option I have not seen, or the compiler does not make these controls ?

Thx
SD

In article <ann0hg$16cs$1@digitaldaemon.com>, SD (stephanedelaval@wanadoo.fr) says...
> Hi,
> I am using the C compiler with the maximum checking option I found, -A -w-
> -r.
> However, the compiler does not check the possible errors as I would like,
> ie :
> - I declared main() as returning a void, and the compiler did not complain.
> - I declared a function returning an int, and I do not use return statement
> in the function body. Again, the compiler does not complain.
> - I use a function without declaring the prototype. The compiler says
> nothing.
> 
> Is there a compiler option I have not seen, or the compiler does not make these controls ?

If you want better compile-time checking, why
not compile your C programs using the C++
compiler?  It's been awhile since I used C
very much, but I recall that the issues you
object to were not errors according to the
C language.  Those and many other needless
lapses were tightened up in C++.

-- 
-Larry Brasfield
(address munged, s/sn/h/ to reply)

Thk for the prompt reply.
You are suggesting a very good solution. However I used the -cpp option
of the sc.exe dmars compiler, and it still have the same problem.
Is there another C++ compiler in the digital mars package ? Except for
this flag, I have not seen any reference for it...
SD

> In article <ann0hg$16cs$1@digitaldaemon.com>, SD (stephanedelaval@wanadoo.fr) says...
>> Hi,
>> I am using the C compiler with the maximum checking option I found,
>> -A -w- -r.
>> However, the compiler does not check the possible errors as I would
>> like, ie :
>> - I declared main() as returning a void, and the compiler did not
>> complain. - I declared a function returning an int, and I do not use
>> return statement in the function body. Again, the compiler does not
>> complain. - I use a function without declaring the prototype. The
>> compiler says nothing.
>> 
>> Is there a compiler option I have not seen, or the compiler does not make these controls ?
> 
> If you want better compile-time checking, why
> not compile your C programs using the C++
> compiler?  It's been awhile since I used C
> very much, but I recall that the issues you
> object to were not errors according to the
> C language.  Those and many other needless
> lapses were tightened up in C++.
> 

In article <ann7mi$1cj9$1@digitaldaemon.com>, SD says...
>>> However, the compiler does not check the possible errors as I would
>>> like, ie :
>>> - I declared main() as returning a void, and the compiler did not
>>> complain. - I declared a function returning an int, and I do not use
>>> return statement in the function body. Again, the compiler does not
>>> complain. - I use a function without declaring the prototype. The
>>> compiler says nothing.

got version 8.29 ?

Yes, I have the latest available.



bw <bw_member@pathlink.com> wrote in news:annuff$24fi$1@digitaldaemon.com:

> 
> In article <ann7mi$1cj9$1@digitaldaemon.com>, SD says...
>>>> However, the compiler does not check the possible errors as I would
>>>> like, ie :
>>>> - I declared main() as returning a void, and the compiler did not
>>>> complain. - I declared a function returning an int, and I do not use
>>>> return statement in the function body. Again, the compiler does not
>>>> complain. - I use a function without declaring the prototype. The
>>>> compiler says nothing.
> 
> got version 8.29 ?
> 
> 
> 
> 
> 

In article <anosh8$ke$1@digitaldaemon.com>, SD says...
>
>Yes, I have the latest available.
>
>> got version 8.29 ?

the 8.29 i have catches all those, don't understand why you're having trouble?

/* testing for errors */
#include <stdio.h>
void main(void)
{
func();
}
int func()
{

}

C:\cpp\my>sc -A -w- -r errs.c
func();
^
errs.c(8) : Error: function 'func' has no prototype
errs.c(15) : Error: need at least one external def
--- errorlevel 1

C:\cpp\my>sc -A -w- -r -cpp errs.c
func();
^
errs.c(8) : Error: function 'func' has no prototype
}
^
errs.c(14) : Error: implied return of func at closing '}' does not return value
errs.c(15) : Error: need at least one external def
--- errorlevel 1

'main' is required to be treated by compilers as a special function (to not break old code), and thus only for 'main' it is legal to declare it as 'void', declare it as int and not return a value. Remember, in older versions of C, a function without type declaration was treated as returning an int, and even then, it was ok for it to not return anything.

afunction(){
...
}

is in reality an 'int' function. These topics have been widely discussed in
C computer magazines and I recollect have been elucidated in the ARM
(Annotated Reference Manual), the standard which talks about C/C++.
- Rajiv


"bw" <bw_member@pathlink.com> wrote in message news:anpfnv$ikk$1@digitaldaemon.com...
> In article <anosh8$ke$1@digitaldaemon.com>, SD says...
> >
> >Yes, I have the latest available.
> >
> >> got version 8.29 ?
>
> the 8.29 i have catches all those, don't understand why you're having
trouble?
>
> /* testing for errors */
> #include <stdio.h>
> void main(void)
> {
> func();
> }
> int func()
> {
>
> }
>
> C:\cpp\my>sc -A -w- -r errs.c
> func();
> ^
> errs.c(8) : Error: function 'func' has no prototype
> errs.c(15) : Error: need at least one external def
> --- errorlevel 1
>
> C:\cpp\my>sc -A -w- -r -cpp errs.c
> func();
> ^
> errs.c(8) : Error: function 'func' has no prototype
> }
> ^
> errs.c(14) : Error: implied return of func at closing '}' does not return
value
> errs.c(15) : Error: need at least one external def
> --- errorlevel 1
>
>
>

Hi
OK, that's fine now. I think the -cpp flag made the difference. Mny
thanks
Stephane


bw <bw_member@pathlink.com> wrote in news:anpfnv$ikk$1@digitaldaemon.com:

> In article <anosh8$ke$1@digitaldaemon.com>, SD says...
>>
>>Yes, I have the latest available.
>>
>>> got version 8.29 ?
> 
> the 8.29 i have catches all those, don't understand why you're having trouble?
> 
> /* testing for errors */
> #include <stdio.h>
> void main(void)
> {
> func();
> }
> int func()
> {
> 
> }
> 
> C:\cpp\my>sc -A -w- -r errs.c
> func();
> ^
> errs.c(8) : Error: function 'func' has no prototype
> errs.c(15) : Error: need at least one external def
> --- errorlevel 1
> 
> C:\cpp\my>sc -A -w- -r -cpp errs.c
> func();
> ^
> errs.c(8) : Error: function 'func' has no prototype
> }
> ^
> errs.c(14) : Error: implied return of func at closing '}' does not
> return value errs.c(15) : Error: need at least one external def
> --- errorlevel 1
> 
> 
>