| 1 | # setenv.m4 serial 26 |
| 2 | dnl Copyright (C) 2001-2004, 2006-2014 Free Software Foundation, Inc. |
| 3 | dnl This file is free software; the Free Software Foundation |
| 4 | dnl gives unlimited permission to copy and/or distribute it, |
| 5 | dnl with or without modifications, as long as this notice is preserved. |
| 6 | |
| 7 | AC_DEFUN([gl_FUNC_SETENV], |
| 8 | [ |
| 9 | AC_REQUIRE([gl_FUNC_SETENV_SEPARATE]) |
| 10 | AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles |
| 11 | if test $ac_cv_func_setenv = no; then |
| 12 | HAVE_SETENV=0 |
| 13 | else |
| 14 | AC_CACHE_CHECK([whether setenv validates arguments], |
| 15 | [gl_cv_func_setenv_works], |
| 16 | [AC_RUN_IFELSE([AC_LANG_PROGRAM([[ |
| 17 | #include <stdlib.h> |
| 18 | #include <errno.h> |
| 19 | #include <string.h> |
| 20 | ]], [[ |
| 21 | int result = 0; |
| 22 | { |
| 23 | if (setenv ("", "", 0) != -1) |
| 24 | result |= 1; |
| 25 | else if (errno != EINVAL) |
| 26 | result |= 2; |
| 27 | } |
| 28 | { |
| 29 | if (setenv ("a", "=", 1) != 0) |
| 30 | result |= 4; |
| 31 | else if (strcmp (getenv ("a"), "=") != 0) |
| 32 | result |= 8; |
| 33 | } |
| 34 | return result; |
| 35 | ]])], |
| 36 | [gl_cv_func_setenv_works=yes], [gl_cv_func_setenv_works=no], |
| 37 | [case "$host_os" in |
| 38 | # Guess yes on glibc systems. |
| 39 | *-gnu*) gl_cv_func_setenv_works="guessing yes" ;; |
| 40 | # If we don't know, assume the worst. |
| 41 | *) gl_cv_func_setenv_works="guessing no" ;; |
| 42 | esac |
| 43 | ])]) |
| 44 | case "$gl_cv_func_setenv_works" in |
| 45 | *yes) ;; |
| 46 | *) |
| 47 | REPLACE_SETENV=1 |
| 48 | ;; |
| 49 | esac |
| 50 | fi |
| 51 | ]) |
| 52 | |
| 53 | # Like gl_FUNC_SETENV, except prepare for separate compilation |
| 54 | # (no REPLACE_SETENV, no AC_LIBOBJ). |
| 55 | AC_DEFUN([gl_FUNC_SETENV_SEPARATE], |
| 56 | [ |
| 57 | AC_REQUIRE([gl_STDLIB_H_DEFAULTS]) |
| 58 | AC_CHECK_DECLS_ONCE([setenv]) |
| 59 | if test $ac_cv_have_decl_setenv = no; then |
| 60 | HAVE_DECL_SETENV=0 |
| 61 | fi |
| 62 | AC_CHECK_FUNCS_ONCE([setenv]) |
| 63 | gl_PREREQ_SETENV |
| 64 | ]) |
| 65 | |
| 66 | AC_DEFUN([gl_FUNC_UNSETENV], |
| 67 | [ |
| 68 | AC_REQUIRE([gl_STDLIB_H_DEFAULTS]) |
| 69 | AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles |
| 70 | AC_CHECK_DECLS_ONCE([unsetenv]) |
| 71 | if test $ac_cv_have_decl_unsetenv = no; then |
| 72 | HAVE_DECL_UNSETENV=0 |
| 73 | fi |
| 74 | AC_CHECK_FUNCS([unsetenv]) |
| 75 | if test $ac_cv_func_unsetenv = no; then |
| 76 | HAVE_UNSETENV=0 |
| 77 | else |
| 78 | HAVE_UNSETENV=1 |
| 79 | dnl Some BSDs return void, failing to do error checking. |
| 80 | AC_CACHE_CHECK([for unsetenv() return type], [gt_cv_func_unsetenv_ret], |
| 81 | [AC_COMPILE_IFELSE( |
| 82 | [AC_LANG_PROGRAM( |
| 83 | [[ |
| 84 | #undef _BSD |
| 85 | #define _BSD 1 /* unhide unsetenv declaration in OSF/1 5.1 <stdlib.h> */ |
| 86 | #include <stdlib.h> |
| 87 | extern |
| 88 | #ifdef __cplusplus |
| 89 | "C" |
| 90 | #endif |
| 91 | int unsetenv (const char *name); |
| 92 | ]], |
| 93 | [[]])], |
| 94 | [gt_cv_func_unsetenv_ret='int'], |
| 95 | [gt_cv_func_unsetenv_ret='void'])]) |
| 96 | if test $gt_cv_func_unsetenv_ret = 'void'; then |
| 97 | AC_DEFINE([VOID_UNSETENV], [1], [Define to 1 if unsetenv returns void |
| 98 | instead of int.]) |
| 99 | REPLACE_UNSETENV=1 |
| 100 | fi |
| 101 | |
| 102 | dnl Solaris 10 unsetenv does not remove all copies of a name. |
| 103 | dnl Haiku alpha 2 unsetenv gets confused by assignment to environ. |
| 104 | dnl OpenBSD 4.7 unsetenv("") does not fail. |
| 105 | AC_CACHE_CHECK([whether unsetenv obeys POSIX], |
| 106 | [gl_cv_func_unsetenv_works], |
| 107 | [AC_RUN_IFELSE([AC_LANG_PROGRAM([[ |
| 108 | #include <stdlib.h> |
| 109 | #include <errno.h> |
| 110 | extern char **environ; |
| 111 | ]], [[ |
| 112 | char entry1[] = "a=1"; |
| 113 | char entry2[] = "b=2"; |
| 114 | char *env[] = { entry1, entry2, NULL }; |
| 115 | if (putenv ((char *) "a=1")) return 1; |
| 116 | if (putenv (entry2)) return 2; |
| 117 | entry2[0] = 'a'; |
| 118 | unsetenv ("a"); |
| 119 | if (getenv ("a")) return 3; |
| 120 | if (!unsetenv ("") || errno != EINVAL) return 4; |
| 121 | entry2[0] = 'b'; |
| 122 | environ = env; |
| 123 | if (!getenv ("a")) return 5; |
| 124 | entry2[0] = 'a'; |
| 125 | unsetenv ("a"); |
| 126 | if (getenv ("a")) return 6; |
| 127 | ]])], |
| 128 | [gl_cv_func_unsetenv_works=yes], [gl_cv_func_unsetenv_works=no], |
| 129 | [case "$host_os" in |
| 130 | # Guess yes on glibc systems. |
| 131 | *-gnu*) gl_cv_func_unsetenv_works="guessing yes" ;; |
| 132 | # If we don't know, assume the worst. |
| 133 | *) gl_cv_func_unsetenv_works="guessing no" ;; |
| 134 | esac |
| 135 | ])]) |
| 136 | case "$gl_cv_func_unsetenv_works" in |
| 137 | *yes) ;; |
| 138 | *) |
| 139 | REPLACE_UNSETENV=1 |
| 140 | ;; |
| 141 | esac |
| 142 | fi |
| 143 | ]) |
| 144 | |
| 145 | # Prerequisites of lib/setenv.c. |
| 146 | AC_DEFUN([gl_PREREQ_SETENV], |
| 147 | [ |
| 148 | AC_REQUIRE([AC_FUNC_ALLOCA]) |
| 149 | AC_REQUIRE([gl_ENVIRON]) |
| 150 | AC_CHECK_HEADERS_ONCE([unistd.h]) |
| 151 | AC_CHECK_HEADERS([search.h]) |
| 152 | AC_CHECK_FUNCS([tsearch]) |
| 153 | ]) |
| 154 | |
| 155 | # Prerequisites of lib/unsetenv.c. |
| 156 | AC_DEFUN([gl_PREREQ_UNSETENV], |
| 157 | [ |
| 158 | AC_REQUIRE([gl_ENVIRON]) |
| 159 | AC_CHECK_HEADERS_ONCE([unistd.h]) |
| 160 | ]) |