-# setenv.m4 serial 10
-dnl Copyright (C) 2001-2004, 2006-2008 Free Software Foundation, Inc.
+# 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,
dnl with or without modifications, as long as this notice is preserved.
AC_DEFUN([gl_FUNC_SETENV],
[
- AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
- AC_CHECK_FUNCS_ONCE([setenv])
- if test $ac_cv_func_setenv = no; then
- HAVE_SETENV=0
+ AC_REQUIRE([gl_FUNC_SETENV_SEPARATE])
+ if test $HAVE_SETENV$REPLACE_SETENV != 10; then
AC_LIBOBJ([setenv])
- gl_PREREQ_SETENV
fi
])
AC_CHECK_FUNCS_ONCE([setenv])
if test $ac_cv_func_setenv = no; then
HAVE_SETENV=0
+ else
+ AC_CACHE_CHECK([whether setenv validates arguments],
+ [gl_cv_func_setenv_works],
+ [AC_RUN_IFELSE([AC_LANG_PROGRAM([[
+ #include <stdlib.h>
+ #include <errno.h>
+ #include <string.h>
+ ]], [[
+ if (setenv ("", "", 0) != -1) return 1;
+ if (errno != EINVAL) return 2;
+ if (setenv ("a", "=", 1) != 0) return 3;
+ if (strcmp (getenv ("a"), "=") != 0) return 4;
+ ]])],
+ [gl_cv_func_setenv_works=yes], [gl_cv_func_setenv_works=no],
+ [gl_cv_func_setenv_works="guessing no"])])
+ if test "$gl_cv_func_setenv_works" != yes; then
+ REPLACE_SETENV=1
+ AC_LIBOBJ([setenv])
+ fi
fi
gl_PREREQ_SETENV
])
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>
+ 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(
+ [[
+#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 $gt_cv_func_unsetenv_ret = 'void'; then
- VOID_UNSETENV=1
+ AC_DEFINE([VOID_UNSETENV], [1], [Define to 1 if unsetenv returns void
+ instead of int.])
+ REPLACE_UNSETENV=1
+ AC_LIBOBJ([unsetenv])
+ fi
+
+ dnl Solaris 10 unsetenv does not remove all copies of a name.
+ dnl OpenBSD 4.7 unsetenv("") does not fail.
+ AC_CACHE_CHECK([whether unsetenv obeys POSIX],
+ [gl_cv_func_unsetenv_works],
+ [AC_RUN_IFELSE([AC_LANG_PROGRAM([[
+ #include <stdlib.h>
+ #include <errno.h>
+ ]], [[
+ char entry[] = "b=2";
+ if (putenv ((char *) "a=1")) return 1;
+ if (putenv (entry)) return 2;
+ entry[0] = 'a';
+ unsetenv ("a");
+ if (getenv ("a")) return 3;
+ if (!unsetenv ("") || errno != EINVAL) return 4;
+ ]])],
+ [gl_cv_func_unsetenv_works=yes], [gl_cv_func_unsetenv_works=no],
+ [gl_cv_func_unsetenv_works="guessing no"])])
+ if test "$gl_cv_func_unsetenv_works" != yes; then
+ REPLACE_UNSETENV=1
+ AC_LIBOBJ([unsetenv])
fi
fi
])
[
AC_REQUIRE([AC_FUNC_ALLOCA])
AC_REQUIRE([gl_ENVIRON])
- AC_CHECK_HEADERS_ONCE(unistd.h)
- AC_CHECK_HEADERS(search.h)
- AC_CHECK_FUNCS(tsearch)
+ 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)
+ AC_CHECK_HEADERS_ONCE([unistd.h])
])