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Re: documentation of AC_FUNC_ALLOCA and mingw-w64 compilers

From: Vincent Torri
Subject: Re: documentation of AC_FUNC_ALLOCA and mingw-w64 compilers
Date: Sun, 22 Jan 2012 21:45:41 +0100 (CET)

On Sun, 22 Jan 2012, Paul Eggert wrote:

On 01/22/2012 04:17 AM, Vincent Torri wrote:
2) the MinGW-w64 compiler already defines alloca in malloc.h,
that header files being included by stdlib.h because STDC_HEADERS is defined.

Could you give more details about the problem?
STDC_HEADERS is in the user's space, so the system
stdlib.h should be unaffected by whether STDC_HEADERS
is defined.  Are we talking about the system's stdlib.h
here, or by your own substitute for stdlib.h?  If the
latter, then it might be something outside the
scope of the autoconf documentation.

there was a warning when using mingw-w64 compilers : redefinition of alloca. The line where the redefinition is located is:

#elif defined __GNUC__
# define alloca __builtin_alloca   <---- that one

and there was a redefinition because stdlib.h is included just above, and stdlib.h includes malloc.h. And with mingw-w64 compilers, malloc.h already defines alloca.

I hope I'm clearer :)

Vincent Torri

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