Supressing output with AC_CHECK_DECL, etc.

[Jason Curl <j.m.curl@xxxxxxxxxxxxxxx>]

Hello,

I've had to invent a new check for 'localtime_r()' if we need to define
_REENTRANT or not. For example:

Cygwin/Linux:
#include <time.h>

Solaris/Interix-3.5:
#define _REENTRANT
#include <time.h>

Then we can use localtime_r() without warnings.

However, my macro that I've written prints out twice checking for localtime_r because
the first time I check and if it isn't there, I repeat the check with _REENTRANT
defined. How can I supress these printouts from AC_CHECK_DECL and replace them with my own?
I'm using autoconf-2.61. It appears that AC_FD_MSG will always print something.

Comments on the macro are also welcome.

Thanks,
Jason.

# $Source: /home/cvs/repository/LX2005/code/m4/systimer.m4,v $
# $Id: systimer.m4,v 1.2 2007/05/04 13:25:39 a15595 Exp $

# LX_HEADER_TIMEFUNC
# ------------------
# Checks for the inclusion style for <time.h> and <sys/time.h>. On some
# systems (e.g. Interix-3.5) if we want localtime_r() we also need to define
# _REENTRANT.
#
# TODO: When checking for localtime_r() have better control over what is printed

AC_DEFUN([LX_HEADER_TIMEFUNC],
  [AC_CHECK_HEADERS(sys/time.h)

   if test -z $ac_cv_header_time; then
      AC_HEADER_TIME
   fi

   # Check if we have the following functions
   AC_CHECK_DECL([timersub],
      [AC_DEFINE(HAVE_TIMERSUB,1,[Some OSes don't have this])],
      [AC_LIBOBJ([timersub])],
[#if TIME_WITH_SYS_TIME
# include <sys/time.h>
# include <time.h>
#else
# if HAVE_SYS_TIME_H
#  include <sys/time.h>
# else
#  include <time.h>
# endif
#endif
])
   AC_CHECK_DECL([timeradd],
      [AC_DEFINE(HAVE_TIMERADD,1,[Some OSes don't have this])],
      [AC_LIBOBJ([timeradd])],
[#if TIME_WITH_SYS_TIME
# include <sys/time.h>
# include <time.h>
#else
# if HAVE_SYS_TIME_H
#  include <sys/time.h>
# else
#  include <time.h>
# endif
#endif
])

   # Check if we have 'localtime_r()'
])
   AC_CHECK_DECL([timeradd],
      [AC_DEFINE(HAVE_TIMERADD,1,[Some OSes don't have this])],
      [AC_LIBOBJ([timeradd])],
[#if TIME_WITH_SYS_TIME
# include <sys/time.h>
# include <time.h>
#else
# if HAVE_SYS_TIME_H
#  include <sys/time.h>
# else
#  include <time.h>
# endif
#endif
])

   # Check if we have 'localtime_r()'
   AC_CHECK_DECL([localtime_r],
      [AC_DEFINE(HAVE_LOCALTIME_R,1,[Not all Operating Systems support this])],
      [unset ac_cv_have_decl_localtime_r
       AC_CHECK_DECL([localtime_r],
         [AC_DEFINE(HAVE_LOCALTIME_R,1,[Not all Operating Systems support this])
          AC_DEFINE(_REENTRANT,1,[When including time, provides localtime_r()])],
         [],
[#define _REENTRANT
#if TIME_WITH_SYS_TIME
# include <sys/time.h>
# include <time.h>
#else
# if HAVE_SYS_TIME_H
#  include <sys/time.h>
# else
#  include <time.h>
# endif
#endif
])],
[#if TIME_WITH_SYS_TIME
# include <sys/time.h>
# include <time.h>
#else
# if HAVE_SYS_TIME_H
#  include <sys/time.h>
# else
#  include <time.h>
# endif
#endif
])
]) 


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