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annotate m4/remainderf.m4 @ 17363:5a51fb7777a9

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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 9855b352e525
children 344018b6e5d7
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
17355
9855b352e525 regex: port to mingw's recent addition of undeclared alarm
Eric Blake <eblake@redhat.com>
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1 # remainderf.m4 serial 8
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2 dnl Copyright (C) 2012-2013 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
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7 AC_DEFUN([gl_FUNC_REMAINDERF],
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8 [
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9 m4_divert_text([DEFAULTS], [gl_remainderf_required=plain])
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10 AC_REQUIRE([gl_MATH_H_DEFAULTS])
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11 AC_REQUIRE([gl_FUNC_REMAINDER])
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12
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13 dnl Persuade glibc <math.h> to declare remainderf().
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14 AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
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15
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16 dnl Test whether remainderf() exists. Assume that remainderf(), if it exists, is
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17 dnl defined in the same library as remainder().
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18 save_LIBS="$LIBS"
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19 LIBS="$LIBS $REMAINDER_LIBM"
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20 AC_CACHE_CHECK([for remainderf],
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21 [gl_cv_func_remainderf],
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22 [
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23 AC_LINK_IFELSE(
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24 [AC_LANG_PROGRAM(
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25 [[#ifndef __NO_MATH_INLINES
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26 # define __NO_MATH_INLINES 1 /* for glibc */
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27 #endif
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28 #include <math.h>
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29 extern
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30 #ifdef __cplusplus
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31 "C"
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32 #endif
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33 float remainderf (float, float);
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34 float (*funcptr) (float, float) = remainderf;
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35 float x;
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36 float y;]],
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37 [[return funcptr (x, y) > 1
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38 || remainderf (x, y) > 1;]])],
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39 [gl_cv_func_remainderf=yes],
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40 [gl_cv_func_remainderf=no])
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41 ])
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42 LIBS="$save_LIBS"
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43 if test $gl_cv_func_remainderf = yes; then
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44 REMAINDERF_LIBM="$REMAINDER_LIBM"
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45
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46 save_LIBS="$LIBS"
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47 LIBS="$LIBS $REMAINDERF_LIBM"
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48 gl_FUNC_REMAINDERF_WORKS
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49 LIBS="$save_LIBS"
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50 case "$gl_cv_func_remainderf_works" in
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51 *yes) ;;
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52 *) REPLACE_REMAINDERF=1 ;;
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53 esac
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54
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55 m4_ifdef([gl_FUNC_REMAINDERF_IEEE], [
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56 if test $gl_remainderf_required = ieee && test $REPLACE_REMAINDERF = 0; then
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57 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
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58 AC_CACHE_CHECK([whether remainderf works according to ISO C 99 with IEC 60559],
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59 [gl_cv_func_remainderf_ieee],
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60 [
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61 save_LIBS="$LIBS"
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62 LIBS="$LIBS $REMAINDERF_LIBM"
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63 AC_RUN_IFELSE(
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64 [AC_LANG_SOURCE([[
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65 #ifndef __NO_MATH_INLINES
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66 # define __NO_MATH_INLINES 1 /* for glibc */
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67 #endif
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68 #include <math.h>
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69 extern
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70 #ifdef __cplusplus
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71 "C"
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72 #endif
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73 float remainderf (float, float);
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74 /* Compare two numbers with ==.
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75 This is a separate function because IRIX 6.5 "cc -O" miscompiles an
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76 'x == x' test. */
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77 static int
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78 numeric_equal (float x, float y)
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79 {
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80 return x == y;
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81 }
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82 static float dummy (float x, float y) { return 0; }
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83 int main (int argc, char *argv[])
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84 {
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85 float (*my_remainderf) (float, float) = argc ? remainderf : dummy;
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86 float f;
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87 /* Test remainderf(...,0.0f).
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88 This test fails on OSF/1 5.1. */
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89 f = my_remainderf (2.0f, 0.0f);
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90 if (numeric_equal (f, f))
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91 return 1;
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92 return 0;
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93 }
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94 ]])],
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95 [gl_cv_func_remainderf_ieee=yes],
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96 [gl_cv_func_remainderf_ieee=no],
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97 [case "$host_os" in
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98 # Guess yes on glibc systems.
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99 *-gnu*) gl_cv_func_remainderf_ieee="guessing yes" ;;
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100 # If we don't know, assume the worst.
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101 *) gl_cv_func_remainderf_ieee="guessing no" ;;
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102 esac
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103 ])
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104 LIBS="$save_LIBS"
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105 ])
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106 case "$gl_cv_func_remainderf_ieee" in
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107 *yes) ;;
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108 *) REPLACE_REMAINDERF=1 ;;
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109 esac
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110 fi
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111 ])
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112 else
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113 HAVE_REMAINDERF=0
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114 fi
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115 if test $HAVE_REMAINDERF = 0 || test $REPLACE_REMAINDERF = 1; then
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116 dnl Find libraries needed to link lib/remainderf.c.
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117 if test $gl_cv_func_remainder_no_libm = yes \
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118 || test $gl_cv_func_remainder_in_libm = yes; then
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119 AC_DEFINE([HAVE_REMAINDER], [1],
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120 [Define to 1 if the remainder() function is available in libc or libm.])
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121 REMAINDERF_LIBM="$REMAINDER_LIBM"
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122 else
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123 AC_REQUIRE([gl_FUNC_FABSF])
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124 AC_REQUIRE([gl_FUNC_FMODF])
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125 AC_REQUIRE([gl_FUNC_ISNANF])
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126 REMAINDERF_LIBM=
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127 dnl Append $FABSF_LIBM to REMAINDERF_LIBM, avoiding gratuitous duplicates.
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128 case " $REMAINDERF_LIBM " in
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129 *" $FABSF_LIBM "*) ;;
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130 *) REMAINDERF_LIBM="$REMAINDERF_LIBM $FABSF_LIBM" ;;
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131 esac
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132 dnl Append $FMODF_LIBM to REMAINDERF_LIBM, avoiding gratuitous duplicates.
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133 case " $REMAINDERF_LIBM " in
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134 *" $FMODF_LIBM "*) ;;
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135 *) REMAINDERF_LIBM="$REMAINDERF_LIBM $FMODF_LIBM" ;;
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136 esac
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137 dnl Append $ISNANF_LIBM to REMAINDERF_LIBM, avoiding gratuitous duplicates.
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138 case " $REMAINDERF_LIBM " in
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139 *" $ISNANF_LIBM "*) ;;
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140 *) REMAINDERF_LIBM="$REMAINDERF_LIBM $ISNANF_LIBM" ;;
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141 esac
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142 fi
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143 fi
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144 AC_SUBST([REMAINDERF_LIBM])
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145 ])
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146
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147 dnl Test whether remainderf() works.
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148 dnl It runs into an endless loop on IRIX 6.5.
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149 AC_DEFUN([gl_FUNC_REMAINDERF_WORKS],
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150 [
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151 AC_REQUIRE([AC_PROG_CC])
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152 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
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153 AC_CHECK_DECLS_ONCE([alarm])
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154 AC_CACHE_CHECK([whether remainderf works], [gl_cv_func_remainderf_works],
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155 [
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156 AC_RUN_IFELSE(
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157 [AC_LANG_SOURCE([[
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158 #include <math.h>
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159 #if HAVE_DECL_ALARM
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160 # include <signal.h>
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161 # include <unistd.h>
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162 #endif
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163 extern
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164 #ifdef __cplusplus
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165 "C"
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166 #endif
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167 float remainderf (float, float);
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168 volatile float x;
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169 volatile float y;
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170 float z;
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171 int main ()
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172 {
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173 #if HAVE_DECL_ALARM
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174 signal (SIGALRM, SIG_DFL);
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175 alarm (5);
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176 #endif
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177 /* This test fails on IRIX 6.5. */
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178 x = 9.316161e+37f;
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179 y = 0.5475547314f;
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180 z = remainderf (x, y);
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181 return 0;
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182 }
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183 ]])],
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184 [gl_cv_func_remainderf_works=yes],
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185 [gl_cv_func_remainderf_works=no],
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186 [case "$host_os" in
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187 irix*) gl_cv_func_remainderf_works="guessing no";;
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188 *) gl_cv_func_remainderf_works="guessing yes";;
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189 esac
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190 ])
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191 ])
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192 ])