1 | # setenv.m4 serial 30
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2 | dnl Copyright (C) 2001-2004, 2006-2021 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_SETENV],
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8 | [
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9 | AC_REQUIRE([gl_FUNC_SETENV_SEPARATE])
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10 | AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
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11 | if test $ac_cv_func_setenv = no; then
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12 | HAVE_SETENV=0
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13 | else
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14 | AC_CACHE_CHECK([whether setenv validates arguments],
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15 | [gl_cv_func_setenv_works],
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16 | [AC_RUN_IFELSE([AC_LANG_PROGRAM([[
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17 | #include <stdlib.h>
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18 | #include <errno.h>
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19 | #include <string.h>
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20 | ]], [[
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21 | int result = 0;
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22 | {
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23 | if (setenv ("", "", 0) != -1)
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24 | result |= 1;
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25 | else if (errno != EINVAL)
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26 | result |= 2;
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27 | }
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28 | {
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29 | if (setenv ("a", "=", 1) != 0)
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30 | result |= 4;
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31 | else if (strcmp (getenv ("a"), "=") != 0)
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32 | result |= 8;
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33 | }
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34 | return result;
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35 | ]])],
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36 | [gl_cv_func_setenv_works=yes], [gl_cv_func_setenv_works=no],
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37 | [case "$host_os" in
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38 | # Guess yes on glibc systems.
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39 | *-gnu* | gnu*) gl_cv_func_setenv_works="guessing yes" ;;
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40 | # Guess yes on musl systems.
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41 | *-musl*) gl_cv_func_setenv_works="guessing yes" ;;
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42 | # If we don't know, obey --enable-cross-guesses.
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43 | *) gl_cv_func_setenv_works="$gl_cross_guess_normal" ;;
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44 | esac
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45 | ])])
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46 | case "$gl_cv_func_setenv_works" in
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47 | *yes) ;;
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48 | *)
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49 | REPLACE_SETENV=1
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50 | ;;
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51 | esac
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52 | fi
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53 | ])
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54 |
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55 | # Like gl_FUNC_SETENV, except prepare for separate compilation
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56 | # (no REPLACE_SETENV, no AC_LIBOBJ).
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57 | AC_DEFUN([gl_FUNC_SETENV_SEPARATE],
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58 | [
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59 | AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
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60 | AC_CHECK_DECLS_ONCE([setenv])
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61 | if test $ac_cv_have_decl_setenv = no; then
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62 | HAVE_DECL_SETENV=0
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63 | fi
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64 | AC_CHECK_FUNCS_ONCE([setenv])
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65 | gl_PREREQ_SETENV
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66 | ])
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67 |
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68 | AC_DEFUN([gl_FUNC_UNSETENV],
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69 | [
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70 | AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
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71 | AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
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72 | AC_CHECK_DECLS_ONCE([unsetenv])
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73 | if test $ac_cv_have_decl_unsetenv = no; then
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74 | HAVE_DECL_UNSETENV=0
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75 | fi
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76 | AC_CHECK_FUNCS([unsetenv])
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77 | if test $ac_cv_func_unsetenv = no; then
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78 | HAVE_UNSETENV=0
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79 | else
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80 | HAVE_UNSETENV=1
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81 | dnl Some BSDs return void, failing to do error checking.
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82 | AC_CACHE_CHECK([for unsetenv() return type], [gt_cv_func_unsetenv_ret],
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83 | [AC_COMPILE_IFELSE(
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84 | [AC_LANG_PROGRAM(
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85 | [[
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86 | #undef _BSD
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87 | #define _BSD 1 /* unhide unsetenv declaration in OSF/1 5.1 <stdlib.h> */
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88 | #include <stdlib.h>
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89 | extern
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90 | #ifdef __cplusplus
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91 | "C"
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92 | #endif
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93 | int unsetenv (const char *name);
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94 | ]],
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95 | [[]])],
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96 | [gt_cv_func_unsetenv_ret='int'],
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97 | [gt_cv_func_unsetenv_ret='void'])])
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98 | if test $gt_cv_func_unsetenv_ret = 'void'; then
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99 | AC_DEFINE([VOID_UNSETENV], [1], [Define to 1 if unsetenv returns void
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100 | instead of int.])
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101 | REPLACE_UNSETENV=1
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102 | fi
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103 |
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104 | dnl Solaris 10 unsetenv does not remove all copies of a name.
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105 | dnl Haiku alpha 2 unsetenv gets confused by assignment to environ.
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106 | dnl OpenBSD 4.7 unsetenv("") does not fail.
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107 | AC_CACHE_CHECK([whether unsetenv obeys POSIX],
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108 | [gl_cv_func_unsetenv_works],
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109 | [AC_RUN_IFELSE(
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110 | [AC_LANG_PROGRAM([[
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111 | #include <stdlib.h>
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112 | #include <errno.h>
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113 | extern char **environ;
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114 | ]GL_MDA_DEFINES],
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115 | [[
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116 | char entry1[] = "a=1";
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117 | char entry2[] = "b=2";
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118 | char *env[] = { entry1, entry2, NULL };
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119 | if (putenv ((char *) "a=1")) return 1;
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120 | if (putenv (entry2)) return 2;
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121 | entry2[0] = 'a';
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122 | unsetenv ("a");
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123 | if (getenv ("a")) return 3;
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124 | if (!unsetenv ("") || errno != EINVAL) return 4;
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125 | entry2[0] = 'b';
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126 | environ = env;
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127 | if (!getenv ("a")) return 5;
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128 | entry2[0] = 'a';
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129 | unsetenv ("a");
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130 | if (getenv ("a")) return 6;
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131 | ]])],
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132 | [gl_cv_func_unsetenv_works=yes],
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133 | [gl_cv_func_unsetenv_works=no],
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134 | [case "$host_os" in
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135 | # Guess yes on glibc systems.
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136 | *-gnu*) gl_cv_func_unsetenv_works="guessing yes" ;;
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137 | # If we don't know, obey --enable-cross-guesses.
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138 | *) gl_cv_func_unsetenv_works="$gl_cross_guess_normal" ;;
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139 | esac
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140 | ])
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141 | ])
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142 | case "$gl_cv_func_unsetenv_works" in
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143 | *yes) ;;
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144 | *)
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145 | REPLACE_UNSETENV=1
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146 | ;;
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147 | esac
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148 | fi
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149 | ])
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150 |
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151 | # Prerequisites of lib/setenv.c.
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152 | AC_DEFUN([gl_PREREQ_SETENV],
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153 | [
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154 | AC_REQUIRE([AC_FUNC_ALLOCA])
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155 | AC_REQUIRE([gl_ENVIRON])
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156 | AC_CHECK_HEADERS_ONCE([unistd.h])
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157 | AC_CHECK_HEADERS([search.h])
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158 | AC_CHECK_FUNCS([tsearch])
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159 | ])
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160 |
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161 | # Prerequisites of lib/unsetenv.c.
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162 | AC_DEFUN([gl_PREREQ_UNSETENV],
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163 | [
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164 | AC_REQUIRE([gl_ENVIRON])
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165 | AC_CHECK_HEADERS_ONCE([unistd.h])
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166 | ])
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