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alloca redeclaration warning on MinGW

From: Hrvoje Niksic
Subject: alloca redeclaration warning on MinGW
Date: Mon, 27 Jun 2005 12:30:53 +0200
User-agent: Gnus/5.1007 (Gnus v5.10.7) XEmacs/21.4.17 (Jumbo Shrimp, linux)

A tester tells me that the alloca declaration from the latest (CVS)
Autoconf manual, now installed in Wget, warns about symbol
redeclaration on MinGW:

# include <alloca.h>
#elif defined __GNUC__
# define alloca __builtin_alloca

The problem is that MinGW is using GNU C, but also #defines alloca to
__builtin_alloca in malloc.h, presumably to be compatible with MS VC.

One way to deal with this is to add "# undef alloca" before the
definition, but undeffing alloca defined by system libraries makes me
somewhat uneasy.  But then again, it would be only done for GCC, where
__builtin_alloca should always work, right?

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