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[Ada] New gnatls switch -aPdir

From: Arnaud Charlet <charlet at adacore dot com>
To: gcc-patches at gcc dot gnu dot org
Cc: Vincent Celier <celier at adacore dot com>
Date: Wed, 24 Apr 2013 10:33:30 -0400
Subject: [Ada] New gnatls switch -aPdir

A new switch -aPdir is added to gnatls. When gnatls is called with one
or several switches -aPdir and also switch -v, the directories specified
in the -aP switches are displayed immediately after the current directory
in the Project Search Path.
A new warning is issued by gnatls for switches that are not recognized by
gnatls.
The GNAT driver when called as "gnat ls/list -aPdir ..." will also used
the switch -aPdir in its invocation of gnatls.

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

2013-04-24  Vincent Celier  <celier@adacore.com>

	* gnat_ugn.texi: Document new gnatls switch -aPdir.
	* gnatcmd.adb: Pass switch -aP<dir> to gnatls.
	* gnatls.adb (Scan_Ls_Arg): Process new switch -aP<dir>. Issue
	a warning for unknown switches.
	(Usage): Add line for new switch -aPdir.

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