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

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Package: emacs;

Reported by: Lawrence Mitchell <wence <at> gmx.li>

Date: Tue, 11 May 2010 11:01:01 UTC

Severity: normal

Found in version 24.0.50

Done: Dan Nicolaescu <dann <at> gnu.org>

Bug is archived. No further changes may be made.

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From: Lawrence Mitchell <wence <at> gmx.li>
To: bug-gnu-emacs <at> gnu.org
Subject: bug#6170: 24.0.50; Compiling on solaris2.10 with gcc doesn't define alloca
Date: Mon, 31 May 2010 17:42:34 +0100

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.

Cheers,
Lawrence

-- 
Lawrence Mitchell <wence <at> gmx.li>
This bug report was last modified 14 years and 362 days ago.

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