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[Ada] Undefined symbols with pragma Initialize_Scalars

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, 18 Nov 2015 05:06:03 -0500
Subject: [Ada] Undefined symbols with pragma Initialize_Scalars
Authentication-results: sourceware.org; auth=none

This patch modifies the generation of a constrained array subtype for an object
declaration to use an external name. This ensures that a reference to the array
subtype bounds are consistent when compiling with various switches and pragmas
such as Initialize_Scalars. No simple reproducer possible.

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

2015-11-18  Hristian Kirtchev  <kirtchev@adacore.com>

	* exp_util.adb (Expand_Subtype_From_Expr): Add new formal
	parameter Related_Id and propagate it to Make_Subtype_From_Expr.
	(Make_Subtype_From_Expr): Add new formal parameter
	Related_Id. Create external entities when requested by the caller.
	* exp_util.ads (Expand_Subtype_From_Expr): Add new formal
	parameter Related_Id. Update the comment on usage.
	(Make_Subtype_From_Expr): Add new formal parameter
	Related_Id. Update the comment on usage.
	* sem_ch3.adb (Analyze_Object_Declaration): Add local variable
	Related_Id. Generate an external constrained subtype when the
	object is a public symbol.

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