-# setenv.m4 serial 4
-dnl Copyright (C) 2001-2003 Free Software Foundation, Inc.
-dnl This file is free software, distributed under the terms of the GNU
-dnl General Public License. As a special exception to the GNU General
-dnl Public License, this file may be distributed as part of a program
-dnl that contains a configuration script generated by Autoconf, under
-dnl the same distribution terms as the rest of that program.
+# setenv.m4 serial 10
+dnl Copyright (C) 2001-2004, 2006-2008 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([gt_FUNC_SETENV],
+AC_DEFUN([gl_FUNC_SETENV],
[
- AC_REPLACE_FUNCS(setenv unsetenv)
+ AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
+ AC_CHECK_FUNCS_ONCE([setenv])
if test $ac_cv_func_setenv = no; then
+ HAVE_SETENV=0
+ AC_LIBOBJ([setenv])
gl_PREREQ_SETENV
fi
- if test $ac_cv_func_unsetenv = no; then
- gl_PREREQ_UNSETENV
+])
+
+# Like gl_FUNC_SETENV, except prepare for separate compilation (no AC_LIBOBJ).
+AC_DEFUN([gl_FUNC_SETENV_SEPARATE],
+[
+ AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
+ AC_CHECK_FUNCS_ONCE([setenv])
+ if test $ac_cv_func_setenv = no; then
+ HAVE_SETENV=0
fi
+ gl_PREREQ_SETENV
])
-# Check if a variable is properly declared.
-# gt_CHECK_VAR_DECL(includes,variable)
-AC_DEFUN([gt_CHECK_VAR_DECL],
+AC_DEFUN([gl_FUNC_UNSETENV],
[
- define([gt_cv_var], [gt_cv_var_]$2[_declaration])
- AC_MSG_CHECKING([if $2 is properly declared])
- AC_CACHE_VAL(gt_cv_var, [
- AC_TRY_COMPILE([$1
- extern struct { int foo; } $2;],
- [$2.foo = 1;],
- gt_cv_var=no,
- gt_cv_var=yes)])
- AC_MSG_RESULT($gt_cv_var)
- if test $gt_cv_var = yes; then
- AC_DEFINE([HAVE_]translit($2, [a-z], [A-Z])[_DECL], 1,
- [Define if you have the declaration of $2.])
+ AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
+ AC_CHECK_FUNCS([unsetenv])
+ if test $ac_cv_func_unsetenv = no; then
+ HAVE_UNSETENV=0
+ AC_LIBOBJ([unsetenv])
+ gl_PREREQ_UNSETENV
+ else
+ AC_CACHE_CHECK([for unsetenv() return type], gt_cv_func_unsetenv_ret,
+ [AC_TRY_COMPILE([#include <stdlib.h>
+extern
+#ifdef __cplusplus
+"C"
+#endif
+#if defined(__STDC__) || defined(__cplusplus)
+int unsetenv (const char *name);
+#else
+int unsetenv();
+#endif
+], , gt_cv_func_unsetenv_ret='int', gt_cv_func_unsetenv_ret='void')])
+ if test $gt_cv_func_unsetenv_ret = 'void'; then
+ VOID_UNSETENV=1
+ fi
fi
])
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)
- gt_CHECK_VAR_DECL([#include <errno.h>], errno)
- gt_CHECK_VAR_DECL([#include <unistd.h>], environ)
])
# Prerequisites of lib/unsetenv.c.
AC_DEFUN([gl_PREREQ_UNSETENV],
[
+ AC_REQUIRE([gl_ENVIRON])
AC_CHECK_HEADERS_ONCE(unistd.h)
- gt_CHECK_VAR_DECL([#include <errno.h>], errno)
- gt_CHECK_VAR_DECL([#include <unistd.h>], environ)
])