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author Karl Berry <karl@freefriends.org>
date Mon, 24 Aug 2015 06:09:19 -0700
parents ab58d4870664
children
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1 # truncf.m4 serial 9
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2 dnl Copyright (C) 2007, 2010-2015 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_TRUNCF],
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8 [
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9 m4_divert_text([DEFAULTS], [gl_truncf_required=plain])
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10 AC_REQUIRE([gl_MATH_H_DEFAULTS])
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11 dnl Persuade glibc <math.h> to declare truncf().
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12 AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
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13 dnl Test whether truncf() is declared.
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14 AC_CHECK_DECLS([truncf], , , [[#include <math.h>]])
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15 if test "$ac_cv_have_decl_truncf" = yes; then
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16 dnl Test whether truncf() can be used without libm.
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17 TRUNCF_LIBM=?
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18 AC_LINK_IFELSE(
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19 [AC_LANG_PROGRAM(
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20 [[#ifndef __NO_MATH_INLINES
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21 # define __NO_MATH_INLINES 1 /* for glibc */
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22 #endif
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23 #include <math.h>
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24 float x;]],
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25 [[x = truncf(x);]])],
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26 [TRUNCF_LIBM=])
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27 if test "$TRUNCF_LIBM" = "?"; then
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28 save_LIBS="$LIBS"
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29 LIBS="$LIBS -lm"
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30 AC_LINK_IFELSE(
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31 [AC_LANG_PROGRAM(
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32 [[#ifndef __NO_MATH_INLINES
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33 # define __NO_MATH_INLINES 1 /* for glibc */
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34 #endif
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35 #include <math.h>
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36 float x;]],
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37 [[x = truncf(x);]])],
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38 [TRUNCF_LIBM="-lm"])
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39 LIBS="$save_LIBS"
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40 fi
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41 if test "$TRUNCF_LIBM" = "?"; then
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42 TRUNCF_LIBM=
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43 fi
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44 m4_ifdef([gl_FUNC_TRUNCF_IEEE], [
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45 if test $gl_truncf_required = ieee && test $REPLACE_TRUNCF = 0; then
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46 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
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47 AC_CACHE_CHECK([whether truncf works according to ISO C 99 with IEC 60559],
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48 [gl_cv_func_truncf_ieee],
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49 [
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50 save_LIBS="$LIBS"
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51 LIBS="$LIBS $TRUNCF_LIBM"
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52 AC_RUN_IFELSE(
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53 [AC_LANG_SOURCE([[
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54 #ifndef __NO_MATH_INLINES
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55 # define __NO_MATH_INLINES 1 /* for glibc */
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56 #endif
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57 #include <math.h>
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58 ]gl_FLOAT_MINUS_ZERO_CODE[
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59 ]gl_FLOAT_SIGNBIT_CODE[
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60 static float dummy (float f) { return 0; }
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61 int main (int argc, char *argv[])
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62 {
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63 float (*my_truncf) (float) = argc ? truncf : dummy;
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64 /* Test whether truncf (-0.0f) is -0.0f. */
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65 if (signbitf (minus_zerof) && !signbitf (my_truncf (minus_zerof)))
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66 return 1;
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67 return 0;
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68 }
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69 ]])],
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70 [gl_cv_func_truncf_ieee=yes],
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71 [gl_cv_func_truncf_ieee=no],
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72 [case "$host_os" in
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73 # Guess yes on glibc systems.
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74 *-gnu*) gl_cv_func_truncf_ieee="guessing yes" ;;
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75 # If we don't know, assume the worst.
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76 *) gl_cv_func_truncf_ieee="guessing no" ;;
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77 esac
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78 ])
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79 LIBS="$save_LIBS"
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80 ])
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81 case "$gl_cv_func_truncf_ieee" in
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82 *yes) ;;
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83 *) REPLACE_TRUNCF=1 ;;
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84 esac
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85 fi
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86 ])
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87 else
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88 HAVE_DECL_TRUNCF=0
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89 fi
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90 if test $HAVE_DECL_TRUNCF = 0 || test $REPLACE_TRUNCF = 1; then
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91 dnl No libraries are needed to link lib/truncf.c.
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92 TRUNCF_LIBM=
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93 fi
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94 AC_SUBST([TRUNCF_LIBM])
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95 ])