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[Ada] Don't allow REASON parameter for pragma Warnings in compiler unit

From: Arnaud Charlet <charlet at adacore dot com>
To: gcc-patches at gcc dot gnu dot org
Cc: Robert Dewar <dewar at adacore dot com>
Date: Tue, 10 Sep 2013 11:15:24 -0400
Subject: [Ada] Don't allow REASON parameter for pragma Warnings in compiler unit
Authentication-results: sourceware.org; auth=none

This patch forbids the use of the pragma Warnings REASON parameter in
compiler units (since this would cause bootstrap issues). This is for
internal development purposes only. No functionality change.

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

2013-09-10  Robert Dewar  <dewar@adacore.com>

	* sem_prag.adb (Analyze_Pragma, case Warnings): Don't allow
	REASON parameter in compiler units (bootstrap issues).

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