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Initial revision

    1: # longdouble.m4 serial 2 (gettext-0.15)
    2: dnl Copyright (C) 2002-2003, 2006 Free Software Foundation, Inc.
    3: dnl This file is free software; the Free Software Foundation
    4: dnl gives unlimited permission to copy and/or distribute it,
    5: dnl with or without modifications, as long as this notice is preserved.
    6: 
    7: dnl From Bruno Haible.
    8: dnl Test whether the compiler supports the 'long double' type.
    9: dnl Prerequisite: AC_PROG_CC
   10: 
   11: dnl This file is only needed in autoconf <= 2.59.  Newer versions of autoconf
   12: dnl have a macro AC_TYPE_LONG_DOUBLE with identical semantics.
   13: 
   14: AC_DEFUN([gt_TYPE_LONGDOUBLE],
   15: [
   16:   AC_CACHE_CHECK([for long double], gt_cv_c_long_double,
   17:     [if test "$GCC" = yes; then
   18:        gt_cv_c_long_double=yes
   19:      else
   20:        AC_TRY_COMPILE([
   21:          /* The Stardent Vistra knows sizeof(long double), but does not support it.  */
   22:          long double foo = 0.0;
   23:          /* On Ultrix 4.3 cc, long double is 4 and double is 8.  */
   24:          int array [2*(sizeof(long double) >= sizeof(double)) - 1];
   25:          ], ,
   26:          gt_cv_c_long_double=yes, gt_cv_c_long_double=no)
   27:      fi])
   28:   if test $gt_cv_c_long_double = yes; then
   29:     AC_DEFINE(HAVE_LONG_DOUBLE, 1, [Define if you have the 'long double' type.])
   30:   fi
   31: ])