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[Ada] Avoid overflow in Write_Int

From: Arnaud Charlet <charlet at adacore dot com>
To: gcc-patches at gcc dot gnu dot org
Cc: Bob Duff <duff at adacore dot com>
Date: Tue, 20 Oct 2015 05:48:09 -0400
Subject: [Ada] Avoid overflow in Write_Int
Authentication-results: sourceware.org; auth=none

This patch avoids an overflow on the most-negative number in Output.Write_Int.
No simple test available.

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

2015-10-20  Bob Duff  <duff@adacore.com>

	* output.adb (Write_Int): Work with negative numbers in order to avoid
	negating Int'First and thereby causing overflow.

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