-# putenv.m4 serial 9
-dnl Copyright (C) 2002, 2003, 2004 Free Software Foundation, Inc.
+# putenv.m4 serial 20
+dnl Copyright (C) 2002-2014 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.
dnl The putenv in libc on at least SunOS 4.1.4 does *not* do that.
AC_DEFUN([gl_FUNC_PUTENV],
-[AC_CACHE_CHECK([for SVID conformant putenv], jm_cv_func_svid_putenv,
- [AC_TRY_RUN([
- int
- main ()
- {
- /* Put it in env. */
- if (putenv ("CONFTEST_putenv=val"))
- exit (1);
+[
+ AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
+ AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
+ AC_CACHE_CHECK([for putenv compatible with GNU and SVID],
+ [gl_cv_func_svid_putenv],
+ [AC_RUN_IFELSE([AC_LANG_PROGRAM([AC_INCLUDES_DEFAULT],[[
+ /* Put it in env. */
+ if (putenv ("CONFTEST_putenv=val"))
+ return 1;
- /* Try to remove it. */
- if (putenv ("CONFTEST_putenv"))
- exit (1);
+ /* Try to remove it. */
+ if (putenv ("CONFTEST_putenv"))
+ return 2;
- /* Make sure it was deleted. */
- if (getenv ("CONFTEST_putenv") != 0)
- exit (1);
+ /* Make sure it was deleted. */
+ if (getenv ("CONFTEST_putenv") != 0)
+ return 3;
- exit (0);
- }
- ],
- jm_cv_func_svid_putenv=yes,
- jm_cv_func_svid_putenv=no,
- dnl When crosscompiling, assume putenv is broken.
- jm_cv_func_svid_putenv=no)
- ])
- if test $jm_cv_func_svid_putenv = no; then
- AC_LIBOBJ(putenv)
- AC_DEFINE(putenv, rpl_putenv,
- [Define to rpl_putenv if the replacement function should be used.])
- gl_PREREQ_PUTENV
- fi
+ return 0;
+ ]])],
+ gl_cv_func_svid_putenv=yes,
+ gl_cv_func_svid_putenv=no,
+ dnl When crosscompiling, assume putenv is broken.
+ [case "$host_os" in
+ # Guess yes on glibc systems.
+ *-gnu*) gl_cv_func_svid_putenv="guessing yes" ;;
+ # If we don't know, assume the worst.
+ *) gl_cv_func_svid_putenv="guessing no" ;;
+ esac
+ ])
+ ])
+ case "$gl_cv_func_svid_putenv" in
+ *yes) ;;
+ *)
+ REPLACE_PUTENV=1
+ ;;
+ esac
])
# Prerequisites of lib/putenv.c.
-AC_DEFUN([gl_PREREQ_PUTENV], [
- AC_CHECK_HEADERS_ONCE(unistd.h)
+AC_DEFUN([gl_PREREQ_PUTENV],
+[
+ AC_CHECK_DECLS([_putenv])
])