Date: Mon, 5 May 2008 16:37:42 -0400 From: John Baldwin <jhb@freebsd.org> To: Peter Jeremy <peterjeremy@optushome.com.au> Cc: cvs-src@freebsd.org, Alfred Perlstein <alfred@freebsd.org>, src-committers@freebsd.org, cvs-all@freebsd.org Subject: Re: cvs commit: src/include stdio.h src/lib/libc/stdio clrerr.c feof.c ferror.c fileno.c getc.c getchar.c local.h putc.c putchar.c xprintf.c Message-ID: <200805051637.43073.jhb@freebsd.org> In-Reply-To: <20080505192417.GS7293@server.vk2pj.dyndns.org> References: <200805051603.m45G3rrN089219@repoman.freebsd.org> <200805051459.29200.jhb@freebsd.org> <20080505192417.GS7293@server.vk2pj.dyndns.org>
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On Monday 05 May 2008 03:24:17 pm Peter Jeremy wrote: > On Mon, May 05, 2008 at 02:59:28PM -0400, John Baldwin wrote: > >On Monday 05 May 2008 02:40:03 pm Alfred Perlstein wrote: > >> I'm _not_ objecting, just interested in why. > >> > >> Any references to discussions on this? Are we now safe for > >> future compat or something? > > > >Having FILE be opaque broke just about every 'configure' script on the > >planet. :( > > Either autoconf and friends are _intended_ as impediments to > portability or they are completely broken by design. It appears that autoconf only believes a type is real if you can typedef it to another type, cast 0 to a valid pointer to the new typedef'd type, and do a sizeof() of the typdef'd type. The last is where having an opaque type breaks down for scripts that want to make sure FILE is a real type. -- John Baldwin
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