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annotate m4/modf.m4 @ 17252:7a29ec33d6c5

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author Karl Berry <karl@freefriends.org>
date Tue, 01 Jan 2013 09:17:08 -0800
parents e542fd46ad6f
children 344018b6e5d7
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1 # modf.m4 serial 3
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2 dnl Copyright (C) 2011-2013 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 AC_DEFUN([gl_FUNC_MODF],
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8 [
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9 m4_divert_text([DEFAULTS], [gl_modf_required=plain])
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10 AC_REQUIRE([gl_MATH_H_DEFAULTS])
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11
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12 dnl Determine MODF_LIBM.
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13 gl_MATHFUNC([modf], [double], [(double, double *)])
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14
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15 m4_ifdef([gl_FUNC_MODF_IEEE], [
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16 if test $gl_modf_required = ieee && test $REPLACE_MODF = 0; then
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17 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
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18 AC_CACHE_CHECK([whether modf works according to ISO C 99 with IEC 60559],
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19 [gl_cv_func_modf_ieee],
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20 [
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21 save_LIBS="$LIBS"
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22 LIBS="$LIBS $MODF_LIBM"
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23 AC_RUN_IFELSE(
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24 [AC_LANG_SOURCE([[
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25 #ifndef __NO_MATH_INLINES
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26 # define __NO_MATH_INLINES 1 /* for glibc */
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27 #endif
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28 #include <math.h>
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29 ]gl_DOUBLE_MINUS_ZERO_CODE[
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30 ]gl_DOUBLE_SIGNBIT_CODE[
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31 /* Compare two numbers with ==.
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32 This is a separate function because IRIX 6.5 "cc -O" miscompiles an
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33 'x == x' test. */
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34 static int
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35 numeric_equal (double x, double y)
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36 {
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37 return x == y;
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38 }
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39 static double dummy (double x, double *iptr) { return 0; }
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40 double zero;
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41 double minus_one = - 1.0;
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42 int main (int argc, char *argv[])
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43 {
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44 double (*my_modf) (double, double *) = argc ? modf : dummy;
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45 int result = 0;
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46 double i;
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47 double f;
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48 /* Test modf(NaN,...).
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49 This test fails on NetBSD 5.1, Cygwin. */
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50 f = my_modf (zero / zero, &i);
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51 if (numeric_equal (f, f))
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52 result |= 1;
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53 /* Test modf(-Inf,...).
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54 This test fails on FreeBSD 6.4, OpenBSD 4.9, IRIX 6.5, OSF/1 5.1. */
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55 f = my_modf (minus_one / zero, &i);
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56 if (!(f == 0.0) || (signbitd (minus_zerod) && !signbitd (f)))
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57 result |= 2;
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58 return result;
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59 }
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60 ]])],
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61 [gl_cv_func_modf_ieee=yes],
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62 [gl_cv_func_modf_ieee=no],
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63 [case "$host_os" in
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64 # Guess yes on glibc systems.
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65 *-gnu*) gl_cv_func_modf_ieee="guessing yes" ;;
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66 # If we don't know, assume the worst.
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67 *) gl_cv_func_modf_ieee="guessing no" ;;
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68 esac
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69 ])
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70 LIBS="$save_LIBS"
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71 ])
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72 case "$gl_cv_func_modf_ieee" in
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73 *yes) ;;
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74 *) REPLACE_MODF=1 ;;
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75 esac
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76 fi
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77 ])
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78 if test $REPLACE_MODF = 1; then
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79 dnl Find libraries needed to link lib/modf.c.
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80 AC_REQUIRE([gl_FUNC_TRUNC])
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81 MODF_LIBM="$TRUNC_LIBM"
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82 fi
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83 ])