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31 lines
1.1 KiB
31 lines
1.1 KiB
dnl Copyright (C) 1993-2006 Free Software Foundation, Inc.
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dnl This file is free software, distributed under the terms of the GNU
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dnl General Public License. As a special exception to the GNU General
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dnl Public License, this file may be distributed as part of a program
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dnl that contains a configuration script generated by Autoconf, under
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dnl the same distribution terms as the rest of that program.
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dnl From Bruno Haible, Marcus Daniels, Paul Eggert.
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AC_PREREQ(2.13)
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AC_DEFUN([CL_LONGDOUBLE],
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[AC_CACHE_CHECK(for long double type, cl_cv_c_longdouble, [
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AC_TRY_RUN([
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#include <stdlib.h>
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int main()
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{ long double x = 2.7182818284590452354L; x = x*x; exit (x==0.0L); }
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],
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cl_cv_c_longdouble=yes, cl_cv_c_longdouble=no, [
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dnl When cross-compiling, use the test from gnulib.
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AC_TRY_COMPILE([
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/* The Stardent Vistra knows sizeof(long double), but does not support it. */
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long double foo = 0.0;
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/* On Ultrix 4.3 cc, long double is 4 and double is 8. */
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int array [2*(sizeof(long double) >= sizeof(double)) - 1];
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], , cl_cv_c_longdouble=yes, cl_cv_c_longdouble=no)])
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])
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if test $cl_cv_c_longdouble = yes; then
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AC_DEFINE(HAVE_LONGDOUBLE)
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fi
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])
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