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[Ada] New implementation-defined pragma: Attribute_Definition

From: Arnaud Charlet <charlet at adacore dot com>
To: gcc-patches at gcc dot gnu dot org
Cc: Thomas Quinot <quinot at adacore dot com>
Date: Mon, 29 Oct 2012 07:23:43 -0400
Subject: [Ada] New implementation-defined pragma: Attribute_Definition

This change introduces a new implementation defined pragma
"Attribute_Definition", which allows an attribute definition clause to be
expressed in a backward-compatible manner: compilers not supporting the
pragma, or the specified attribute, will just ignore it.

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

2012-10-29  Thomas Quinot  <quinot@adacore.com>

	* gnat_rm.texi, sem_prag.adb, sem_util.adb, sem_util.ads,
	par-prag.adb, par-util.adb, snames.ads-tmpl (Sem_Prag.Analyze_Pragma):
	Handle new pragma Attribute_Definition.
	(Sem_Util.Bad_Attribute): New routine, moved here
	from par-util, so that it can be used by the above.
	(Par_Util.Signal_Bad_Attribute): Processing moved to
	Sem_Util.Bad_Attribute.

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