-# setenv.m4 serial 15
+# setenv.m4 serial 18
dnl Copyright (C) 2001-2004, 2006-2010 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
[AC_RUN_IFELSE([AC_LANG_PROGRAM([[
#include <stdlib.h>
#include <errno.h>
+ #include <string.h>
]], [[
if (setenv ("", "", 0) != -1) return 1;
if (errno != EINVAL) return 2;
else
dnl Some BSDs return void, failing to do error checking.
AC_CACHE_CHECK([for unsetenv() return type], [gt_cv_func_unsetenv_ret],
- [AC_TRY_COMPILE([#include <stdlib.h>
+ [AC_COMPILE_IFELSE(
+ [AC_LANG_PROGRAM(
+ [[
+#include <stdlib.h>
extern
#ifdef __cplusplus
"C"
#else
int unsetenv();
#endif
-], , gt_cv_func_unsetenv_ret='int', gt_cv_func_unsetenv_ret='void')])
+ ]],
+ [[]])],
+ [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.])
fi
dnl Solaris 10 unsetenv does not remove all copies of a name.
- AC_CACHE_CHECK([whether unsetenv works on duplicates],
+ 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>
]], [[
char entry[] = "b=2";
if (putenv ((char *) "a=1")) return 1;
entry[0] = 'a';
unsetenv ("a");
if (getenv ("a")) return 3;
+ if (!unsetenv ("") || errno != EINVAL) return 4;
]])],
[gl_cv_func_unsetenv_works=yes], [gl_cv_func_unsetenv_works=no],
[gl_cv_func_unsetenv_works="guessing no"])])