Path: csiph.com!weretis.net!feeder6.news.weretis.net!feeder7.news.weretis.net!eternal-september.org!feeder.eternal-september.org!reader01.eternal-september.org!.POSTED!not-for-mail
From: Keith Thompson <kst-u@mib.org>
Newsgroups: comp.lang.c
Subject: Re: OT: improve this simple algorithm?
Date: Thu, 14 Nov 2019 10:15:28 -0800
Organization: None to speak of
Lines: 21
Message-ID: <ln36eq2ukf.fsf@kst-u.example.com>
References: <C_EyF.8877$yS5.1510@fx22.iad> <a8qmsel3h4p6j7b35j0f501rr00sqi1fu9@4ax.com> <lnbltg32fc.fsf@kst-u.example.com> <qqgk1g$pq1$1@dont-email.me> <E8SyF.324056$NI41.13621@fx12.am4> <qqguti$n3d$1@dont-email.me> <WITyF.3176$XV5.2873@fx15.am4> <qqh9dd$lo3$1@dont-email.me> <ebWyF.46153$7z4.34438@fx09.am4> <qqhtp6$m0m$1@dont-email.me> <7C%yF.190832$mB7.170245@fx32.am4> <qqj5lm$5qt$1@dont-email.me>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Injection-Info: reader02.eternal-september.org; posting-host="91c2f33abe4e47ebddbfec820ab61ca8"; logging-data="32106"; mail-complaints-to="abuse@eternal-september.org";	posting-account="U2FsdGVkX1+w4/voy0RiiaqHG9HAn/FA"
User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/23.1 (gnu/linux)
Cancel-Lock: sha1:caAGu4DZu4OswBdaBNCIuDipp2A= sha1:hpiibbdvUdOXhOigfBFDEGcb/Rw=
Xref: csiph.com comp.lang.c:147991

David Brown <david.brown@hesbynett.no> writes:
[...]
> 	gcc -Wvla
>
> warns if a VLA is used.
>
> And
> 	gcc -Wvla-larger-than=10000
>
> warns if a VLA is bigger than 10000 bytes (or might be bigger than
> that).  It is useful to have optimisation enabled to let the compiler
> work out bounds more accurately.

Note that the latter option might not warn about some VLAs if gcc has
optimized them into ordinary arrays.  (The gcc documentation covers
this.)

-- 
Keith Thompson (The_Other_Keith) kst-u@mib.org  <http://www.ghoti.net/~kst>
Working, but not speaking, for Philips Healthcare
void Void(void) { Void(); } /* The recursive call of the void */