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From: Keith Thompson <kst-u@mib.org>
Newsgroups: comp.lang.c
Subject: Re: Problems with lcc-win32
Date: Sun, 05 Mar 2017 19:35:03 -0800
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jacob navia <jacob@jacob.remcomp.fr> writes:
> Le 05/03/2017 à 23:12, mertesthomas@gmail.com a écrit :
[...]
>> 3. A missing include file just triggers a warning. I had to change my test
>> programs to use something from the include file. This way I can recognize
>> when an include file is found by the C compiler.
>
> Well, that can be fixed easily. Will do next week. Transform the warning 
> in error. But...
>
> I am too liberal maybe? People like errors instead of warnings?
>
> What if you have an unused include missing? Nothing happens. Now all 
> those builds would crash. Is that better?
>
> What do you think?
[...]

In my opinion a missing include file should be a fatal error.  (If it's
unused, then don't include it.)  That's certainly what I'm used to, and
every compiler I've tried bails out immediately if a header is missing
(it won't even try to diagnose any following errors).  I suspect a lot
of users would be very surprised to see a missing include diagnosed with
a non-fatal warning.

Feel free to consider the fact that I'm not an lcc-win user in deciding
how to deal with this.

On the other hand, some kind of conditional include might be a useful
extension, perhaps something like:

    #include_if_exists <some_header.h>

and/or

    #if_header_exists <some_header.h>
    /* ... */
    #else
    /* ... */
    #endif

-- 
Keith Thompson (The_Other_Keith) kst-u@mib.org  <http://www.ghoti.net/~kst>
Working, but not speaking, for JetHead Development, Inc.
"We must do something.  This is something.  Therefore, we must do this."
    -- Antony Jay and Jonathan Lynn, "Yes Minister"