161 lines
4.5 KiB
Plaintext
161 lines
4.5 KiB
Plaintext
# setenv.m4 serial 26
|
|
dnl Copyright (C) 2001-2004, 2006-2013 Free Software Foundation, Inc.
|
|
dnl This file is free software; the Free Software Foundation
|
|
dnl gives unlimited permission to copy and/or distribute it,
|
|
dnl with or without modifications, as long as this notice is preserved.
|
|
|
|
AC_DEFUN([gl_FUNC_SETENV],
|
|
[
|
|
AC_REQUIRE([gl_FUNC_SETENV_SEPARATE])
|
|
AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
|
|
if test $ac_cv_func_setenv = no; then
|
|
HAVE_SETENV=0
|
|
else
|
|
AC_CACHE_CHECK([whether setenv validates arguments],
|
|
[gl_cv_func_setenv_works],
|
|
[AC_RUN_IFELSE([AC_LANG_PROGRAM([[
|
|
#include <stdlib.h>
|
|
#include <errno.h>
|
|
#include <string.h>
|
|
]], [[
|
|
int result = 0;
|
|
{
|
|
if (setenv ("", "", 0) != -1)
|
|
result |= 1;
|
|
else if (errno != EINVAL)
|
|
result |= 2;
|
|
}
|
|
{
|
|
if (setenv ("a", "=", 1) != 0)
|
|
result |= 4;
|
|
else if (strcmp (getenv ("a"), "=") != 0)
|
|
result |= 8;
|
|
}
|
|
return result;
|
|
]])],
|
|
[gl_cv_func_setenv_works=yes], [gl_cv_func_setenv_works=no],
|
|
[case "$host_os" in
|
|
# Guess yes on glibc systems.
|
|
*-gnu*) gl_cv_func_setenv_works="guessing yes" ;;
|
|
# If we don't know, assume the worst.
|
|
*) gl_cv_func_setenv_works="guessing no" ;;
|
|
esac
|
|
])])
|
|
case "$gl_cv_func_setenv_works" in
|
|
*yes) ;;
|
|
*)
|
|
REPLACE_SETENV=1
|
|
;;
|
|
esac
|
|
fi
|
|
])
|
|
|
|
# Like gl_FUNC_SETENV, except prepare for separate compilation
|
|
# (no REPLACE_SETENV, no AC_LIBOBJ).
|
|
AC_DEFUN([gl_FUNC_SETENV_SEPARATE],
|
|
[
|
|
AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
|
|
AC_CHECK_DECLS_ONCE([setenv])
|
|
if test $ac_cv_have_decl_setenv = no; then
|
|
HAVE_DECL_SETENV=0
|
|
fi
|
|
AC_CHECK_FUNCS_ONCE([setenv])
|
|
gl_PREREQ_SETENV
|
|
])
|
|
|
|
AC_DEFUN([gl_FUNC_UNSETENV],
|
|
[
|
|
AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
|
|
AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
|
|
AC_CHECK_DECLS_ONCE([unsetenv])
|
|
if test $ac_cv_have_decl_unsetenv = no; then
|
|
HAVE_DECL_UNSETENV=0
|
|
fi
|
|
AC_CHECK_FUNCS([unsetenv])
|
|
if test $ac_cv_func_unsetenv = no; then
|
|
HAVE_UNSETENV=0
|
|
else
|
|
HAVE_UNSETENV=1
|
|
dnl Some BSDs return void, failing to do error checking.
|
|
AC_CACHE_CHECK([for unsetenv() return type], [gt_cv_func_unsetenv_ret],
|
|
[AC_COMPILE_IFELSE(
|
|
[AC_LANG_PROGRAM(
|
|
[[
|
|
#undef _BSD
|
|
#define _BSD 1 /* unhide unsetenv declaration in OSF/1 5.1 <stdlib.h> */
|
|
#include <stdlib.h>
|
|
extern
|
|
#ifdef __cplusplus
|
|
"C"
|
|
#endif
|
|
int unsetenv (const char *name);
|
|
]],
|
|
[[]])],
|
|
[gt_cv_func_unsetenv_ret='int'],
|
|
[gt_cv_func_unsetenv_ret='void'])])
|
|
if test $gt_cv_func_unsetenv_ret = 'void'; then
|
|
AC_DEFINE([VOID_UNSETENV], [1], [Define to 1 if unsetenv returns void
|
|
instead of int.])
|
|
REPLACE_UNSETENV=1
|
|
fi
|
|
|
|
dnl Solaris 10 unsetenv does not remove all copies of a name.
|
|
dnl Haiku alpha 2 unsetenv gets confused by assignment to environ.
|
|
dnl OpenBSD 4.7 unsetenv("") does not fail.
|
|
AC_CACHE_CHECK([whether unsetenv obeys POSIX],
|
|
[gl_cv_func_unsetenv_works],
|
|
[AC_RUN_IFELSE([AC_LANG_PROGRAM([[
|
|
#include <stdlib.h>
|
|
#include <errno.h>
|
|
extern char **environ;
|
|
]], [[
|
|
char entry1[] = "a=1";
|
|
char entry2[] = "b=2";
|
|
char *env[] = { entry1, entry2, NULL };
|
|
if (putenv ((char *) "a=1")) return 1;
|
|
if (putenv (entry2)) return 2;
|
|
entry2[0] = 'a';
|
|
unsetenv ("a");
|
|
if (getenv ("a")) return 3;
|
|
if (!unsetenv ("") || errno != EINVAL) return 4;
|
|
entry2[0] = 'b';
|
|
environ = env;
|
|
if (!getenv ("a")) return 5;
|
|
entry2[0] = 'a';
|
|
unsetenv ("a");
|
|
if (getenv ("a")) return 6;
|
|
]])],
|
|
[gl_cv_func_unsetenv_works=yes], [gl_cv_func_unsetenv_works=no],
|
|
[case "$host_os" in
|
|
# Guess yes on glibc systems.
|
|
*-gnu*) gl_cv_func_unsetenv_works="guessing yes" ;;
|
|
# If we don't know, assume the worst.
|
|
*) gl_cv_func_unsetenv_works="guessing no" ;;
|
|
esac
|
|
])])
|
|
case "$gl_cv_func_unsetenv_works" in
|
|
*yes) ;;
|
|
*)
|
|
REPLACE_UNSETENV=1
|
|
;;
|
|
esac
|
|
fi
|
|
])
|
|
|
|
# Prerequisites of lib/setenv.c.
|
|
AC_DEFUN([gl_PREREQ_SETENV],
|
|
[
|
|
AC_REQUIRE([AC_FUNC_ALLOCA])
|
|
AC_REQUIRE([gl_ENVIRON])
|
|
AC_CHECK_HEADERS_ONCE([unistd.h])
|
|
AC_CHECK_HEADERS([search.h])
|
|
AC_CHECK_FUNCS([tsearch])
|
|
])
|
|
|
|
# Prerequisites of lib/unsetenv.c.
|
|
AC_DEFUN([gl_PREREQ_UNSETENV],
|
|
[
|
|
AC_REQUIRE([gl_ENVIRON])
|
|
AC_CHECK_HEADERS_ONCE([unistd.h])
|
|
])
|