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[Ada] Compiler hangs on evaluation of use-clause within package context

From: Pierre-Marie de Rodat <derodat at adacore dot com>
To: gcc-patches at gcc dot gnu dot org
Cc: Justin Squirek <squirek at adacore dot com>
Date: Fri, 29 Sep 2017 09:23:59 -0400
Subject: [Ada] Compiler hangs on evaluation of use-clause within package context
Authentication-results: sourceware.org; auth=none

Due to the installation order of packages within a context clause it is
possible to create circularities within the Prev_Use_Clause clain. This patch
corrects this issue by identifying this case through the use of an extra check.

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

2017-09-29  Justin Squirek  <squirek@adacore.com>

	* sem_ch8.adb (Analyze_Use_Package): Add sanity check to avoid
	circularities in the use-clause chain.

Attachment: difs
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