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From: "Alfred M. Szmidt" <ams@gnu.org>
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Subject: Re: Why is gcc going to default to "GNU dialect of ISO C99?"
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If you wish to use a compiler that ad hers to ISO C99, then you should
use the c99 program as per POSIX 1003.1 2004; that is the proper and
standard compliant way to invoke a ISO C99 compiler.  What the gcc
program will do by default is set by the GNU project, the g after all
stands for GNU, not ISO or POSIX.