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maint: Run 'make update-copyright'
author Paul Eggert <eggert@cs.ucla.edu>
date Tue, 01 Jan 2019 00:25:11 +0100
parents 10eb9086bea0
children e2e6dc79463b
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 # modff.m4 serial 7
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2 dnl Copyright (C) 2011-2019 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_MODFF],
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8 [
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9 m4_divert_text([DEFAULTS], [gl_modff_required=plain])
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10 AC_REQUIRE([gl_MATH_H_DEFAULTS])
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11 AC_REQUIRE([gl_FUNC_MODF])
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12
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13 dnl Persuade glibc <math.h> to declare modff().
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14 AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
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15
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16 dnl Test whether modff() exists. We cannot assume that modff(), if it
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17 dnl exists, is defined in the same library as modf(). This is not the case
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18 dnl on FreeBSD, NetBSD, OpenBSD.
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19 gl_MATHFUNC([modff], [float], [(float, float *)])
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20 if test $gl_cv_func_modff_no_libm = yes \
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21 || test $gl_cv_func_modff_in_libm = yes; then
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22 :
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23 m4_ifdef([gl_FUNC_MODFF_IEEE], [
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24 if test $gl_modff_required = ieee && test $REPLACE_MODFF = 0; then
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25 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
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26 AC_CACHE_CHECK([whether modff works according to ISO C 99 with IEC 60559],
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27 [gl_cv_func_modff_ieee],
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28 [
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29 save_LIBS="$LIBS"
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30 LIBS="$LIBS $MODFF_LIBM"
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31 AC_RUN_IFELSE(
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32 [AC_LANG_SOURCE([[
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33 #ifndef __NO_MATH_INLINES
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34 # define __NO_MATH_INLINES 1 /* for glibc */
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35 #endif
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36 #include <math.h>
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37 ]gl_FLOAT_MINUS_ZERO_CODE[
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38 ]gl_FLOAT_SIGNBIT_CODE[
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39 /* Compare two numbers with ==.
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40 This is a separate function because IRIX 6.5 "cc -O" miscompiles an
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41 'x == x' test. */
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42 static int
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43 numeric_equal (float x, float y)
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44 {
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45 return x == y;
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46 }
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47 static float dummy (float x, float *iptr) { return 0; }
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48 float zero;
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49 float minus_one = - 1.0f;
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50 int main (int argc, char *argv[])
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51 {
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52 float (*my_modff) (float, float *) = argc ? modff : dummy;
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53 int result = 0;
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54 float i;
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55 float f;
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56 /* Test modff(NaN,...).
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57 This test fails on NetBSD 5.1, OpenBSD 4.9, Solaris 9, Cygwin. */
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58 f = my_modff (zero / zero, &i);
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59 if (numeric_equal (f, f))
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60 result |= 1;
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61 /* Test modff(-Inf,...).
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62 This test fails on IRIX 6.5, OSF/1 5.1, mingw. */
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63 f = my_modff (minus_one / zero, &i);
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64 if (!(f == 0.0f) || (signbitf (minus_zerof) && !signbitf (f)))
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65 result |= 2;
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66 return result;
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67 }
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68 ]])],
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69 [gl_cv_func_modff_ieee=yes],
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70 [gl_cv_func_modff_ieee=no],
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71 [case "$host_os" in
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72 # Guess yes on glibc systems.
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73 *-gnu* | gnu*) gl_cv_func_modff_ieee="guessing yes" ;;
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74 # Guess yes on MSVC, no on mingw.
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75 mingw*) AC_EGREP_CPP([Known], [
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76 #ifdef _MSC_VER
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77 Known
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78 #endif
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79 ],
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80 [gl_cv_func_modff_ieee="guessing yes"],
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81 [gl_cv_func_modff_ieee="guessing no"])
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82 ;;
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83 # If we don't know, assume the worst.
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84 *) gl_cv_func_modff_ieee="guessing no" ;;
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85 esac
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86 ])
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87 LIBS="$save_LIBS"
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88 ])
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89 case "$gl_cv_func_modff_ieee" in
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90 *yes) ;;
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91 *) REPLACE_MODFF=1 ;;
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92 esac
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93 fi
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94 ])
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95 else
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96 HAVE_MODFF=0
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97 fi
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98 if test $HAVE_MODFF = 0 || test $REPLACE_MODFF = 1; then
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99 dnl Find libraries needed to link lib/modff.c.
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100 MODFF_LIBM="$MODF_LIBM"
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101 fi
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102 AC_SUBST([MODFF_LIBM])
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103 ])