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From: "david at westcontrol dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/96284] Outdated C features should be made errors with newer
 standards
Date: Tue, 28 Jul 2020 07:20:34 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D96284

--- Comment #6 from David Brown <david at westcontrol dot com> ---
(In reply to Eric Gallager from comment #5)
> (In reply to David Brown from comment #0)

> > Could this be made an error by default
> > (-Werror=3Dimplicit-function-declarations) ?  Let those who want to com=
pile
> > old code with implicit function declarations, do so with an explicit fl=
ag.
>=20
> I think Florian Weimer tried this and it broke the majority of configure
> scripts in existence...

Fixing existing code and build systems is always hard - backwards compatibi=
lity
is C's biggest strength and its biggest weakness.

I'm not bothered about my own code - I have makefiles with the relevant opt=
ions
set in case I make mistakes.  My hope is for gcc to be able to have stricter
warnings to reduce bugs in code written now and in the future.  But I
understand that it's also important not to cause trouble for existing code =
and
build systems.=