copy-acl: enhance Solaris ACL error handling

[gnulib.git] / m4 / unistd_h.m4

diff --git a/m4/unistd_h.m4 b/m4/unistd_h.m4
index f3074ea..31d31c1 100644 (file)
--- a/m4/unistd_h.m4
+++ b/m4/unistd_h.m4
@@ -1,4 +1,4 @@
-# unistd_h.m4 serial 37
+# unistd_h.m4 serial 39
 dnl Copyright (C) 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,
@@ -11,6 +11,7 @@ AC_DEFUN([gl_UNISTD_H],
   dnl Use AC_REQUIRE here, so that the default behavior below is expanded
   dnl once only, before all statements that occur in other macros.
   AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
+  AC_REQUIRE([AC_C_INLINE])
 
   gl_CHECK_NEXT_HEADERS([unistd.h])
 
@@ -21,6 +22,24 @@ AC_DEFUN([gl_UNISTD_H],
     HAVE_UNISTD_H=0
   fi
   AC_SUBST([HAVE_UNISTD_H])
+
+  dnl Check for declarations of anything we want to poison if the
+  dnl corresponding gnulib module is not in use.
+  gl_WARN_ON_USE_PREPARE([[#include <unistd.h>
+/* Some systems declare various items in the wrong headers.  */
+#ifndef __GLIBC__
+# include <fcntl.h>
+# include <stdio.h>
+# include <stdlib.h>
+# if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
+#  include <io.h>
+# endif
+#endif
+    ]], [chown dup2 dup3 environ euidaccess faccessat fchdir fchownat
+    fsync ftruncate getcwd getdomainname getdtablesize getgroups
+    gethostname getlogin getlogin_r getpagesize getusershell setusershell
+    endusershell lchown link linkat lseek pipe2 pread readlink readlinkat
+    rmdir sleep symlink symlinkat unlink unlinkat usleep])
 ])
 
 AC_DEFUN([gl_UNISTD_MODULE_INDICATOR],