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bug#6170: 24.0.50; Compiling on solaris2.10 with gcc doesn't define allo
From: |
Dan Nicolaescu |
Subject: |
bug#6170: 24.0.50; Compiling on solaris2.10 with gcc doesn't define alloca |
Date: |
Wed, 12 May 2010 14:29:40 -0400 |
User-agent: |
Gnus/5.11 (Gnus v5.11) Emacs/22.1 (gnu/linux) |
Lawrence Mitchell <wence@gmx.li> writes:
> On this system, <stdlib.h> is provided by Sun and therefore
> doesn't define alloca, unlike on a typical GNU/linux system where
> <stdlib.h> contains the following:
>
> | #if defined __USE_GNU || defined __USE_BSD || defined __USE_MISC
> | # include <alloca.h>
> | #endif /* Use GNU, BSD, or misc. */
>
> When compiling emacs with gcc, alloca is therefore undefined.
> The culprit is this snippet in configure.in:
>
> | #ifndef __GNUC__
> | # ifdef HAVE_ALLOCA_H
> | # include <alloca.h>
> | # else /* AIX files deal with #pragma. */
> | # ifndef alloca /* predefined by HP cc +Olibcalls */
> | char *alloca ();
> | # endif
> | # endif /* HAVE_ALLOCA_H */
> | #endif /* __GNUC__ */
>
"info autoconf" says that this is the proper way to do it:
#ifdef HAVE_ALLOCA_H
# include <alloca.h>
#elif defined __GNUC__
# define alloca __builtin_alloca
#elif defined _AIX
# define alloca __alloca
#elif defined _MSC_VER
# include <malloc.h>
# define alloca _alloca
#else
# include <stddef.h>
# ifdef __cplusplus
extern "C"
# endif
void *alloca (size_t);
#endif
Not sure we need the last #else part, or the _MSC_VER part...