GNU bug report logs - #6170
24.0.50; Compiling on solaris2.10 with gcc doesn't define alloca

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Message #16 received at 6170-done <at> debbugs.gnu.org (full text, mbox):

From: Dan Nicolaescu <dann <at> gnu.org>
To: Lawrence Mitchell <wence <at> gmx.li>
Cc: 6170-done <at> debbugs.gnu.org
Subject: Re: bug#6170: 24.0.50;
	Compiling on solaris2.10 with gcc doesn't define alloca
Date: Wed, 02 Jun 2010 05:24:36 -0400

Lawrence Mitchell <wence <at> gmx.li> writes:

> Dan Nicolaescu wrote:
>> Lawrence Mitchell <wence <at> 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...
>
> Is there any movement on getting this fix, or something like it,
> installed?  It doesn't seem like a controversial change.

Should be fixed now.

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