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[Ada] Add error detection on .ali reading

From: Arnaud Charlet <charlet at adacore dot com>
To: gcc-patches at gcc dot gnu dot org
Cc: Quentin Ochem <ochem at adacore dot com>
Date: Fri, 6 Apr 2007 12:18:07 +0200
Subject: [Ada] Add error detection on .ali reading

Tested on i686-linux, committed on trunk

This patch adds errors detection on natural reading. We check in Get_Nat is at
the beginning of a number, and if not, we raise an exception in order to remove
the wrong line from the table built.

2007-04-06  Quentin Ochem  <ochem@adacore.com>

	* ali.ads, ali.adb (Get_Nat): Raise an exception if the file cursor is
	not on a natural.
	(Scan_ALI): Cancel the xref line if there has been a reading ALI error.

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