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[Ada] Add support for file attributes on VxWorks 6

From: Arnaud Charlet <charlet at adacore dot com>
To: gcc-patches at gcc dot gnu dot org
Cc: Jose Ruiz <ruiz at adacore dot com>
Date: Fri, 5 Aug 2011 09:32:34 -0400
Subject: [Ada] Add support for file attributes on VxWorks 6

The routines to modify the file attributes (rwx) are now implemented on
VxWorks 6 (kernel and RTP) using the underlying chmod VxWorks routine.

Tested on x86_64-pc-linux-gnu, committed on trunk

2011-08-05  Jose Ruiz  <ruiz@adacore.com>

	* adaint.c (__gnat_set_writable, __gnat_set_readable,
	__gnat_set_executable, __gnat_set_non_writable, __gnat_set_non_readable,
	__gnat_copy_attribs): On VxWorks 6.x and later, the required chmod
	routine is available, so we use the default implementation of these
	functions.
	* s-os_lib.ads (Copy_File, Copy_Time_Stamps): Document that there is
	support for copying attributes on VxWorks 6.

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