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[Ada] Entry family selector not recognised as entity usage

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: Mon, 25 Sep 2017 05:07:14 -0400
Subject: [Ada] Entry family selector not recognised as entity usage
Authentication-results: sourceware.org; auth=none

This patch corrects an issue whereby index actuals in calls to entry families
were not being properly flagged as referenced leading to spurious warnings
when compiling with -gnatwu.

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

gcc/ada/

2017-09-25  Justin Squirek  <squirek@adacore.com>

	* sem_res.adb (Resolve_Entry): Generate reference for index entities.

gcc/testsuite/

2017-09-25  Justin Squirek  <squirek@adacore.com>

	* gnat.dg/entry_family.adb: New testcase

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