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[Ada] Clearer documentation of -gnatw.g and -gnatyg switches

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: Wed, 21 May 2014 07:05:33 -0400
Subject: [Ada] Clearer documentation of -gnatw.g and -gnatyg switches
Authentication-results: sourceware.org; auth=none

This patch provides more precise documentation of the GNAT mode warning
switch -gnatw.g and the GNAT mode style switch -gnatyg, in both the users
guide and the usage information. Documentation change only, no test needed.

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

2014-05-21  Robert Dewar  <dewar@adacore.com>

	* gnat_ugn.texi: Clearly document -gnatw.g (GNAT warnings).
	Clearly document -gnatyg (GNAT style switches).
	* usage.adb: Add line line for -gnatw.g (GNAT warnings) More
	detail for line for -gnatyg (GNAT style switches) -gnatw.d/D is
	available for VMS after all.
	* warnsw.adb: Reorganize to eliminate duplicated code
	(Restore_Warnings): Add a couple of missing entries
	(Save_Warnings): Add a couple of missing entries.
	* warnsw.ads: Add missing entries to Warning_Record (not clear
	what the impact is).

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