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[Ada] Large timeout in delay until causes Time_Error

From: Arnaud Charlet <charlet at adacore dot com>
To: gcc-patches at gcc dot gnu dot org
Cc: Hristian Kirtchev <kirtchev at adacore dot com>
Date: Wed, 15 Apr 2009 11:58:01 +0200
Subject: [Ada] Large timeout in delay until causes Time_Error

This patch protects Delay_Operations.To_Duration against overflow caused by the
conversion of very distant dates (end of time) to Unix duration equivalent.
Routine To_Duration is used in conjunction with "delay until" statements.

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

2009-04-15  Hristian Kirtchev  <kirtchev@adacore.com>

	* a-calend.adb: Move constant Epoch_Offset from package
	Conversion_Operations to top level.
	(Delay_Operations.To_Duration): Define a constant which represents
	"end of time" and use it as a guard against very distant delay dates.
	Protect the code against overflow when performing the origin shift to
	Unix time.

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