annotate m4/strtod.m4 @ 17363:5a51fb7777a9

sys_select, sys_time: port 2013-01-30 Solaris 2.6 fix to Cygwin Problem reported by Marco Atzeri in <http://lists.gnu.org/archive/html/bug-gnulib/2013-03/msg00000.html>. * lib/sys_select.in.h [HAVE_SYS_SELECT_H && _CYGWIN_SYS_TIME_H]: Simply delegate to the system <sys/select.h> in this case too. Also, pay attention to _GL_SYS_SELECT_H_REDIRECT_FROM_SYS_TIME_H only if OSF/1, since otherwise Cygwin breaks, and it doesn't seem to be needed on Solaris either. * lib/sys_time.in.h [_CYGWIN_SYS_TIME_H]: Simply delgate to the system <sys/time.h> in this case.
author Paul Eggert <eggert@cs.ucla.edu>
date Tue, 19 Mar 2013 09:08:47 -0700
parents e542fd46ad6f
children 344018b6e5d7
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1 # strtod.m4 serial 22
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2 dnl Copyright (C) 2002-2003, 2006-2013 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
7c1a6b73f48e An autoconf macro for its associated module.
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7 AC_DEFUN([gl_FUNC_STRTOD],
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8 [
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9 AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
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10 m4_ifdef([gl_FUNC_STRTOD_OBSOLETE], [
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11 dnl Test whether strtod is declared.
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12 dnl Don't call AC_FUNC_STRTOD, because it does not have the right guess
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13 dnl when cross-compiling.
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14 dnl Don't call AC_CHECK_FUNCS([strtod]) because it would collide with the
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15 dnl ac_cv_func_strtod variable set by the AC_FUNC_STRTOD macro.
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16 AC_CHECK_DECLS_ONCE([strtod])
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17 if test $ac_cv_have_decl_strtod != yes; then
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18 HAVE_STRTOD=0
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19 fi
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20 ])
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21 if test $HAVE_STRTOD = 1; then
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22 AC_CACHE_CHECK([whether strtod obeys C99], [gl_cv_func_strtod_works],
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23 [AC_RUN_IFELSE([AC_LANG_PROGRAM([[
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24 #include <stdlib.h>
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25 #include <math.h>
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26 #include <errno.h>
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27 /* Compare two numbers with ==.
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28 This is a separate function because IRIX 6.5 "cc -O" miscompiles an
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29 'x == x' test. */
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30 static int
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31 numeric_equal (double x, double y)
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32 {
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33 return x == y;
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34 }
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35 ]], [[
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36 int result = 0;
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37 {
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38 /* In some old versions of Linux (2000 or before), strtod mis-parses
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39 strings with leading '+'. */
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40 const char *string = " +69";
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41 char *term;
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42 double value = strtod (string, &term);
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43 if (value != 69 || term != (string + 4))
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44 result |= 1;
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45 }
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46 {
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47 /* Under Solaris 2.4, strtod returns the wrong value for the
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48 terminating character under some conditions. */
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49 const char *string = "NaN";
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50 char *term;
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51 strtod (string, &term);
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52 if (term != string && *(term - 1) == 0)
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53 result |= 2;
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54 }
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55 {
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56 /* Older glibc and Cygwin mis-parse "-0x". */
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57 const char *string = "-0x";
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58 char *term;
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59 double value = strtod (string, &term);
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60 double zero = 0.0;
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61 if (1.0 / value != -1.0 / zero || term != (string + 2))
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62 result |= 4;
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63 }
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64 {
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65 /* Many platforms do not parse hex floats. */
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66 const char *string = "0XaP+1";
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67 char *term;
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68 double value = strtod (string, &term);
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69 if (value != 20.0 || term != (string + 6))
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70 result |= 8;
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71 }
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72 {
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73 /* Many platforms do not parse infinities. HP-UX 11.31 parses inf,
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74 but mistakenly sets errno. */
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75 const char *string = "inf";
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76 char *term;
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77 double value;
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78 errno = 0;
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79 value = strtod (string, &term);
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80 if (value != HUGE_VAL || term != (string + 3) || errno)
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81 result |= 16;
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82 }
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83 {
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84 /* glibc 2.7 and cygwin 1.5.24 misparse "nan()". */
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85 const char *string = "nan()";
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86 char *term;
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87 double value = strtod (string, &term);
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88 if (numeric_equal (value, value) || term != (string + 5))
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89 result |= 32;
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90 }
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91 {
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92 /* darwin 10.6.1 misparses "nan(". */
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93 const char *string = "nan(";
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94 char *term;
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95 double value = strtod (string, &term);
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96 if (numeric_equal (value, value) || term != (string + 3))
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97 result |= 64;
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98 }
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99 return result;
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100 ]])],
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101 [gl_cv_func_strtod_works=yes],
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102 [gl_cv_func_strtod_works=no],
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103 [dnl The last known bugs in glibc strtod(), as of this writing,
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104 dnl were fixed in version 2.8
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105 AC_EGREP_CPP([Lucky user],
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106 [
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107 #include <features.h>
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108 #ifdef __GNU_LIBRARY__
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109 #if ((__GLIBC__ == 2 && __GLIBC_MINOR__ >= 8) || (__GLIBC__ > 2)) \
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110 && !defined __UCLIBC__
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111 Lucky user
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112 #endif
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113 #endif
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114 ],
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115 [gl_cv_func_strtod_works="guessing yes"],
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116 [gl_cv_func_strtod_works="guessing no"])])])
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117 case "$gl_cv_func_strtod_works" in
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118 *yes) ;;
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119 *)
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120 REPLACE_STRTOD=1
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121 ;;
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122 esac
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123 fi
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124 ])
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125
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126 # Prerequisites of lib/strtod.c.
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127 AC_DEFUN([gl_PREREQ_STRTOD], [
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128 AC_REQUIRE([gl_CHECK_LDEXP_NO_LIBM])
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129 if test $gl_cv_func_ldexp_no_libm = yes; then
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130 AC_DEFINE([HAVE_LDEXP_IN_LIBC], [1],
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131 [Define if the ldexp function is available in libc.])
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132 fi
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parents: 13427
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133 ])