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Date: Thu, 29 Jul 1999 19:52:00 +0400 (MSD)
Sender: dms@woland.wplus.net
From: Dmitry Samersoff <dms@wplus.net>
To: Patrick van Kleef <pvk@pobox.com>
Subject: Re: [HACKERS] Off-topic: autoconf guru
Cc: pgsql-hackers@postgresql.org


On 29-Jul-99 Patrick van Kleef wrote:
> Hi Dmitry,
> 
> Autoconf can do this out of the box. With the macros AC_LANG_C and 
> AC_LANG_CPLUSPLUS you can switch between C and C++ compiler mode. Here 
> is a small example based on the snippet you provided:

Thank you very match !!!!
It is exactly what I need for !!!

> 
> 
>       AC_PREREQ(2.12)
>       AC_INIT(configure.in)
> 
>       #
>       #  Check which C and C++ compiler to use
>       #
>       AC_PROG_CC
>       AC_PROG_CXX
> 
>       #
>       #  The following checks are done with the C compiler
>       #
>       AC_LANG_C
> 
>       AC_CHECK_FUNC(accept)
> 
> 
>       #
>       #  Now switch over to the C++ compiler for the next test
>       #
>       AC_LANG_CPLUSPLUS
> 
>       AC_MSG_CHECKING(socket size type)
>       AC_TRY_COMPILE([#include <stdlib.h>
>       #include <sys/types.h>
>       #include <sys/socket.h>
>       ],
>       [int a = accept(1, (struct sockaddr *) 0, (int *) 0);],
>       [AC_DEFINE(SOCKET_SIZE_TYPE, int) AC_MSG_RESULT(int)],
>       [AC_DEFINE(SOCKET_SIZE_TYPE, size_t) AC_MSG_RESULT(size_t)])
> 
>       #
>       #  Switch back to C mode again
>       #
>       AC_LANG_C
> 
>       AC_OUTPUT()    
> 
> 
> Best regards,
> 
> Patrick
> -- 
> Patrick van Kleef             
> pkleef@roady.xs4all.nl

---
Dmitry Samersoff, dms@wplus.net, ICQ:3161705
http://devnull.wplus.net
* There will come soft rains ...