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[Ada] Avoid memory exhaustion when using gnatmake -m

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: Tue, 12 Jun 2012 07:09:37 -0400
Subject: [Ada] Avoid memory exhaustion when using gnatmake -m

In large systems, gnatmake may crash when invoked with -m (minimal
recompilation) when there are many sources that have been modified
but have kept the same checksum.
This patch fixes this.
There is no simple test.

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

2012-06-12  Vincent Celier  <celier@adacore.com>

	* ali-util.adb (Time_Stamp_Mismatch): In minimal recompilation
	mode, use Stringt Mark and Release to avoid growing the Stringt
	internal tables uselessly.
	* stringt.adb (Strings_Last): New global variable
	(String_Chars_Last): New global variable.
	(Mark, Release): New procedures.
	* stringt.ads (Mark, Release) New procedures.

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