Annotation of embedaddon/libiconv/srcm4/setenv.m4, revision 1.1.1.2
1.1.1.2 ! misho 1: # setenv.m4 serial 24
! 2: dnl Copyright (C) 2001-2004, 2006-2011 Free Software Foundation, Inc.
1.1 misho 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: [
1.1.1.2 ! misho 9: AC_REQUIRE([gl_FUNC_SETENV_SEPARATE])
1.1 misho 10: if test $ac_cv_func_setenv = no; then
11: HAVE_SETENV=0
1.1.1.2 ! misho 12: else
! 13: AC_CACHE_CHECK([whether setenv validates arguments],
! 14: [gl_cv_func_setenv_works],
! 15: [AC_RUN_IFELSE([AC_LANG_PROGRAM([[
! 16: #include <stdlib.h>
! 17: #include <errno.h>
! 18: #include <string.h>
! 19: ]], [[
! 20: int result = 0;
! 21: {
! 22: if (setenv ("", "", 0) != -1)
! 23: result |= 1;
! 24: else if (errno != EINVAL)
! 25: result |= 2;
! 26: }
! 27: {
! 28: if (setenv ("a", "=", 1) != 0)
! 29: result |= 4;
! 30: else if (strcmp (getenv ("a"), "=") != 0)
! 31: result |= 8;
! 32: }
! 33: return result;
! 34: ]])],
! 35: [gl_cv_func_setenv_works=yes], [gl_cv_func_setenv_works=no],
! 36: [gl_cv_func_setenv_works="guessing no"])])
! 37: if test "$gl_cv_func_setenv_works" != yes; then
! 38: REPLACE_SETENV=1
! 39: fi
1.1 misho 40: fi
41: ])
42:
1.1.1.2 ! misho 43: # Like gl_FUNC_SETENV, except prepare for separate compilation
! 44: # (no REPLACE_SETENV, no AC_LIBOBJ).
1.1 misho 45: AC_DEFUN([gl_FUNC_SETENV_SEPARATE],
46: [
47: AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
1.1.1.2 ! misho 48: AC_CHECK_DECLS_ONCE([setenv])
! 49: if test $ac_cv_have_decl_setenv = no; then
! 50: HAVE_DECL_SETENV=0
1.1 misho 51: fi
1.1.1.2 ! misho 52: AC_CHECK_FUNCS_ONCE([setenv])
1.1 misho 53: gl_PREREQ_SETENV
54: ])
55:
56: AC_DEFUN([gl_FUNC_UNSETENV],
57: [
58: AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
1.1.1.2 ! misho 59: AC_CHECK_DECLS_ONCE([unsetenv])
! 60: if test $ac_cv_have_decl_unsetenv = no; then
! 61: HAVE_DECL_UNSETENV=0
! 62: fi
1.1 misho 63: AC_CHECK_FUNCS([unsetenv])
64: if test $ac_cv_func_unsetenv = no; then
65: HAVE_UNSETENV=0
66: else
1.1.1.2 ! misho 67: HAVE_UNSETENV=1
! 68: dnl Some BSDs return void, failing to do error checking.
1.1 misho 69: AC_CACHE_CHECK([for unsetenv() return type], [gt_cv_func_unsetenv_ret],
1.1.1.2 ! misho 70: [AC_COMPILE_IFELSE(
! 71: [AC_LANG_PROGRAM(
! 72: [[
! 73: #undef _BSD
! 74: #define _BSD 1 /* unhide unsetenv declaration in OSF/1 5.1 <stdlib.h> */
! 75: #include <stdlib.h>
1.1 misho 76: extern
77: #ifdef __cplusplus
78: "C"
79: #endif
80: #if defined(__STDC__) || defined(__cplusplus)
81: int unsetenv (const char *name);
82: #else
83: int unsetenv();
84: #endif
1.1.1.2 ! misho 85: ]],
! 86: [[]])],
! 87: [gt_cv_func_unsetenv_ret='int'],
! 88: [gt_cv_func_unsetenv_ret='void'])])
1.1 misho 89: if test $gt_cv_func_unsetenv_ret = 'void'; then
1.1.1.2 ! misho 90: AC_DEFINE([VOID_UNSETENV], [1], [Define to 1 if unsetenv returns void
! 91: instead of int.])
! 92: REPLACE_UNSETENV=1
! 93: fi
! 94:
! 95: dnl Solaris 10 unsetenv does not remove all copies of a name.
! 96: dnl Haiku alpha 2 unsetenv gets confused by assignment to environ.
! 97: dnl OpenBSD 4.7 unsetenv("") does not fail.
! 98: AC_CACHE_CHECK([whether unsetenv obeys POSIX],
! 99: [gl_cv_func_unsetenv_works],
! 100: [AC_RUN_IFELSE([AC_LANG_PROGRAM([[
! 101: #include <stdlib.h>
! 102: #include <errno.h>
! 103: extern char **environ;
! 104: ]], [[
! 105: char entry1[] = "a=1";
! 106: char entry2[] = "b=2";
! 107: char *env[] = { entry1, entry2, NULL };
! 108: if (putenv ((char *) "a=1")) return 1;
! 109: if (putenv (entry2)) return 2;
! 110: entry2[0] = 'a';
! 111: unsetenv ("a");
! 112: if (getenv ("a")) return 3;
! 113: if (!unsetenv ("") || errno != EINVAL) return 4;
! 114: entry2[0] = 'b';
! 115: environ = env;
! 116: if (!getenv ("a")) return 5;
! 117: entry2[0] = 'a';
! 118: unsetenv ("a");
! 119: if (getenv ("a")) return 6;
! 120: ]])],
! 121: [gl_cv_func_unsetenv_works=yes], [gl_cv_func_unsetenv_works=no],
! 122: [gl_cv_func_unsetenv_works="guessing no"])])
! 123: if test "$gl_cv_func_unsetenv_works" != yes; then
! 124: REPLACE_UNSETENV=1
1.1 misho 125: fi
126: fi
127: ])
128:
129: # Prerequisites of lib/setenv.c.
130: AC_DEFUN([gl_PREREQ_SETENV],
131: [
132: AC_REQUIRE([AC_FUNC_ALLOCA])
133: AC_REQUIRE([gl_ENVIRON])
134: AC_CHECK_HEADERS_ONCE([unistd.h])
135: AC_CHECK_HEADERS([search.h])
136: AC_CHECK_FUNCS([tsearch])
137: ])
138:
139: # Prerequisites of lib/unsetenv.c.
140: AC_DEFUN([gl_PREREQ_UNSETENV],
141: [
142: AC_REQUIRE([gl_ENVIRON])
143: AC_CHECK_HEADERS_ONCE([unistd.h])
144: ])
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