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longdouble.m4 1.2 KB

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  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. dnl From Bruno Haible.
  7. dnl Test whether the compiler supports the 'long double' type.
  8. dnl Prerequisite: AC_PROG_CC
  9. dnl This file is only needed in autoconf <= 2.59. Newer versions of autoconf
  10. dnl have a macro AC_TYPE_LONG_DOUBLE with identical semantics.
  11. AC_DEFUN([gt_TYPE_LONGDOUBLE],
  12. [
  13. AC_CACHE_CHECK([for long double], gt_cv_c_long_double,
  14. [if test "$GCC" = yes; then
  15. gt_cv_c_long_double=yes
  16. else
  17. AC_TRY_COMPILE([
  18. /* The Stardent Vistra knows sizeof(long double), but does not support it. */
  19. long double foo = 0.0;
  20. /* On Ultrix 4.3 cc, long double is 4 and double is 8. */
  21. int array [2*(sizeof(long double) >= sizeof(double)) - 1];
  22. ], ,
  23. gt_cv_c_long_double=yes, gt_cv_c_long_double=no)
  24. fi])
  25. if test $gt_cv_c_long_double = yes; then
  26. AC_DEFINE(HAVE_LONG_DOUBLE, 1, [Define if you have the 'long double' type.])
  27. fi
  28. ])