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annotate m4/log10f.m4 @ 17729:874a5cc03904

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test-userspec: don't look up numeric user names * tests/test-userspec.c: I found a system for which getpwnam("0") returned a pointer to a non-root user's entry, and that made the test fail. (T): Prefix each numeric input with "+", to inhibit lookup.
author Jim Meyering <meyering@fb.com>
date Fri, 18 Jul 2014 14:16:44 -0700
parents 344018b6e5d7
children ab58d4870664
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 # log10f.m4 serial 6
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2 dnl Copyright (C) 2011-2014 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_LOG10F],
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8 [
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9 m4_divert_text([DEFAULTS], [gl_log10f_required=plain])
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10 AC_REQUIRE([gl_MATH_H_DEFAULTS])
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11 AC_REQUIRE([gl_FUNC_LOG10])
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12
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13 dnl Persuade glibc <math.h> to declare log10f().
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14 AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
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15
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16 dnl Test whether log10f() exists. Assume that log10f(), if it exists, is
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17 dnl defined in the same library as log10().
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18 save_LIBS="$LIBS"
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19 LIBS="$LIBS $LOG10_LIBM"
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20 AC_CHECK_FUNCS([log10f])
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21 LIBS="$save_LIBS"
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22 if test $ac_cv_func_log10f = yes; then
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23 LOG10F_LIBM="$LOG10_LIBM"
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24
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25 save_LIBS="$LIBS"
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26 LIBS="$LIBS $LOG10F_LIBM"
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27 gl_FUNC_LOG10F_WORKS
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28 LIBS="$save_LIBS"
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29 case "$gl_cv_func_log10f_works" in
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30 *yes) ;;
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31 *) REPLACE_LOG10F=1 ;;
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32 esac
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33
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34 m4_ifdef([gl_FUNC_LOG10F_IEEE], [
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35 if test $gl_log10f_required = ieee && test $REPLACE_LOG10F = 0; then
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36 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
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37 AC_CACHE_CHECK([whether log10f works according to ISO C 99 with IEC 60559],
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38 [gl_cv_func_log10f_ieee],
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39 [
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40 save_LIBS="$LIBS"
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41 LIBS="$LIBS $LOG10F_LIBM"
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42 AC_RUN_IFELSE(
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43 [AC_LANG_SOURCE([[
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44 #ifndef __NO_MATH_INLINES
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45 # define __NO_MATH_INLINES 1 /* for glibc */
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46 #endif
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47 #include <math.h>
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48 /* Compare two numbers with ==.
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49 This is a separate function because IRIX 6.5 "cc -O" miscompiles an
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50 'x == x' test. */
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51 static int
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52 numeric_equal (float x, float y)
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53 {
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54 return x == y;
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55 }
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56 static float dummy (float x) { return 0; }
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57 int main (int argc, char *argv[])
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58 {
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59 float (*my_log10f) (float) = argc ? log10f : dummy;
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60 /* Test log10f(negative).
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61 This test fails on NetBSD 5.1. */
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62 float y = my_log10f (-1.0f);
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63 if (numeric_equal (y, y))
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64 return 1;
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65 return 0;
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66 }
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67 ]])],
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68 [gl_cv_func_log10f_ieee=yes],
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69 [gl_cv_func_log10f_ieee=no],
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70 [case "$host_os" in
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71 # Guess yes on glibc systems.
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72 *-gnu*) gl_cv_func_log10f_ieee="guessing yes" ;;
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73 # If we don't know, assume the worst.
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74 *) gl_cv_func_log10f_ieee="guessing no" ;;
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75 esac
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76 ])
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77 LIBS="$save_LIBS"
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78 ])
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79 case "$gl_cv_func_log10f_ieee" in
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80 *yes) ;;
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81 *) REPLACE_LOG10F=1 ;;
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82 esac
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83 fi
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84 ])
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85 else
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86 HAVE_LOG10F=0
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87 fi
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88 if test $HAVE_LOG10F = 0 || test $REPLACE_LOG10F = 1; then
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89 dnl Find libraries needed to link lib/log10f.c.
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90 if test $HAVE_LOG10F = 0; then
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91 LOG10F_LIBM="$LOG10_LIBM"
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92 fi
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93 fi
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94 AC_SUBST([LOG10F_LIBM])
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95 ])
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96
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97 dnl Test whether log10f() works.
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98 dnl On OSF/1 5.1, log10f(-0.0f) is NaN.
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99 AC_DEFUN([gl_FUNC_LOG10F_WORKS],
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100 [
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101 AC_REQUIRE([AC_PROG_CC])
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102 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
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103 AC_CACHE_CHECK([whether log10f works], [gl_cv_func_log10f_works],
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104 [
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105 AC_RUN_IFELSE(
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106 [AC_LANG_SOURCE([[
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107 #include <math.h>
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108 volatile float x;
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109 float y;
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110 int main ()
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111 {
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112 x = -0.0f;
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113 y = log10f (x);
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114 if (!(y + y == y))
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115 return 1;
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116 return 0;
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117 }
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118 ]])],
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119 [gl_cv_func_log10f_works=yes],
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120 [gl_cv_func_log10f_works=no],
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121 [case "$host_os" in
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122 osf*) gl_cv_func_log10f_works="guessing no";;
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123 *) gl_cv_func_log10f_works="guessing yes";;
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124 esac
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125 ])
6828b991e3b9 log10f: Work around OSF/1 5.1 bug.
Bruno Haible <bruno@clisp.org>
parents: 16580
diff changeset
126 ])
6828b991e3b9 log10f: Work around OSF/1 5.1 bug.
Bruno Haible <bruno@clisp.org>
parents: 16580
diff changeset
127 ])