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annotate m4/log.m4 @ 17921:58c1b50299a6

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getopt: give accurate ambiguity diagnostic on mem exhaustion * lib/getopt.c (_getopt_internal_r): The previous commit broke out the loop too early, which could give a false indication of ambiguous options under memory exhaustion.
author Pádraig Brady <P@draigBrady.com>
date Wed, 18 Feb 2015 22:37:31 +0000
parents ab58d4870664
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 # log.m4 serial 4
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2 dnl Copyright (C) 2011-2015 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_LOG],
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8 [
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9 m4_divert_text([DEFAULTS], [gl_log_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 LOG_LIBM.
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13 gl_COMMON_DOUBLE_MATHFUNC([log])
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14
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15 save_LIBS="$LIBS"
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16 LIBS="$LIBS $LOG_LIBM"
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17 gl_FUNC_LOG_WORKS
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18 LIBS="$save_LIBS"
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19 case "$gl_cv_func_log_works" in
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20 *yes) ;;
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21 *) REPLACE_LOG=1 ;;
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22 esac
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23
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24 m4_ifdef([gl_FUNC_LOG_IEEE], [
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25 if test $gl_log_required = ieee && test $REPLACE_LOG = 0; then
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26 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
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27 AC_CACHE_CHECK([whether log works according to ISO C 99 with IEC 60559],
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28 [gl_cv_func_log_ieee],
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29 [
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30 save_LIBS="$LIBS"
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31 LIBS="$LIBS $LOG_LIBM"
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32 AC_RUN_IFELSE(
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33 [AC_LANG_SOURCE([[
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34 #ifndef __NO_MATH_INLINES
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35 # define __NO_MATH_INLINES 1 /* for glibc */
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36 #endif
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37 #include <math.h>
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38 /* Compare two numbers with ==.
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39 This is a separate function because IRIX 6.5 "cc -O" miscompiles an
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40 'x == x' test. */
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41 static int
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42 numeric_equal (double x, double y)
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43 {
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44 return x == y;
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45 }
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46 static double dummy (double x) { return 0; }
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47 int main (int argc, char *argv[])
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48 {
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49 double (*my_log) (double) = argc ? log : dummy;
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50 /* Test log(negative).
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51 This test fails on NetBSD 5.1, Solaris 11 2011-11. */
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52 double y = my_log (-1.0);
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53 if (numeric_equal (y, y))
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54 return 1;
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55 return 0;
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56 }
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57 ]])],
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58 [gl_cv_func_log_ieee=yes],
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59 [gl_cv_func_log_ieee=no],
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60 [case "$host_os" in
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61 # Guess yes on glibc systems.
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62 *-gnu*) gl_cv_func_log_ieee="guessing yes" ;;
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63 # If we don't know, assume the worst.
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64 *) gl_cv_func_log_ieee="guessing no" ;;
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65 esac
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66 ])
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67 LIBS="$save_LIBS"
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68 ])
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69 case "$gl_cv_func_log_ieee" in
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70 *yes) ;;
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71 *) REPLACE_LOG=1 ;;
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72 esac
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73 fi
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74 ])
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75 ])
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76
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77 dnl Test whether log() works.
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78 dnl On OSF/1 5.1, log(-0.0) is NaN.
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79 AC_DEFUN([gl_FUNC_LOG_WORKS],
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80 [
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81 AC_REQUIRE([AC_PROG_CC])
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82 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
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83 AC_CACHE_CHECK([whether log works], [gl_cv_func_log_works],
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84 [
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85 AC_RUN_IFELSE(
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86 [AC_LANG_SOURCE([[
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87 #include <math.h>
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88 volatile double x;
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89 double y;
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90 int main ()
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91 {
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92 x = -0.0;
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93 y = log (x);
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94 if (!(y + y == y))
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95 return 1;
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96 return 0;
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97 }
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98 ]])],
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99 [gl_cv_func_log_works=yes],
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100 [gl_cv_func_log_works=no],
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101 [case "$host_os" in
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102 osf*) gl_cv_func_log_works="guessing no";;
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103 *) gl_cv_func_log_works="guessing yes";;
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104 esac
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105 ])
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106 ])
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107 ])