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Mail Archives: cygwin-apps/2001/04/16/00:06:38

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Date: Mon, 16 Apr 2001 00:06:40 -0400
From: Christopher Faylor <cgf AT redhat DOT com>
To: cygwin-apps AT cygwin DOT com
Subject: Re: next porting question for gcj
Message-ID: <20010416000640.C28133@redhat.com>
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References: <01b301c0c621$063e4ae0$0200a8c0 AT lifelesswks> <200104160327 DOT XAA06356 AT envy DOT delorie DOT com> <01dc01c0c628$23c1f880$0200a8c0 AT lifelesswks> <200104160400 DOT AAA06732 AT envy DOT delorie DOT com>
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In-Reply-To: <200104160400.AAA06732@envy.delorie.com>; from dj@delorie.com on Mon, Apr 16, 2001 at 12:00:07AM -0400

On Mon, Apr 16, 2001 at 12:00:07AM -0400, DJ Delorie wrote:
>A simple test will show you:
>
>main()
>{
>  char *b = alloca(500);
>  return b[3];
>}
>
>Compile with gcc, and you'll see that alloca is implemented directly,
>without function calls.
>
>__builtin_alloca is the internal way gcc implements it; either works
>just fine but __builtin_alloca is more immune to being #define'd to
>something else.  It's not specific to Cygwin.

We did have to:

#define alloca __builtin_alloca

at one point in winsup/... at one point, though.

cgf

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