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[Ada] A dispatching call cannot have a stdcall calling convention

From: Arnaud Charlet <charlet at adacore dot com>
To: gcc-patches at gcc dot gnu dot org
Cc: Pascal Obry <obry at adacore dot com>
Date: Mon, 21 Nov 2011 06:38:48 -0500
Subject: [Ada] A dispatching call cannot have a stdcall calling convention

Issue an error if a pragma convention stdcall is applied to a
dispatching subprogram. Such subprogram cannot be used to interface
to the Win32 API, so in fact this check does not impose any new
restrictions.

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

2011-11-21  Pascal Obry  <obry@adacore.com>

	* sem_prag.adb (Process_Convention): A dispatching call cannot
	have a stdcall calling convention.

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