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[Ada] Crash on expression function and discriminant-dependent component

From: Pierre-Marie de Rodat <derodat at adacore dot com>
To: gcc-patches at gcc dot gnu dot org
Cc: Ed Schonberg <schonberg at adacore dot com>
Date: Fri, 15 Dec 2017 06:35:30 -0500
Subject: [Ada] Crash on expression function and discriminant-dependent component
Authentication-results: sourceware.org; auth=none

This patch fixes a crash on an expression function that is a completion, when
the return expression includes a reference to a discriminant-dependent
component. An expression function that is a completion freezes all types
referenced in the expression, but some itypes are excluded because they are
frozen elsewhere (in the case pf discriminant-dependent component, when the
type itself is frozen).

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

gcc/ada/

2017-12-15  Ed Schonberg  <schonberg@adacore.com>

	* sem_ch6.adb (Freeze_Expr_Types): Do not emit a freeze node for
	an itype that is the type of a discriminant-dependent component.

	Fixes QC04-017.

gcc/testsuite/

2017-12-15  Ed Schonberg  <schonberg@adacore.com>

	* gnat.dg/expr_func2.ads, gnat.dg/expr_func2.adb: New testcase.

Attachment: difs
Description: Text document

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