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