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[Ada] Serial port flow control support

From: Arnaud Charlet <charlet at adacore dot com>
To: gcc-patches at gcc dot gnu dot org
Cc: Thomas Quinot <quinot at adacore dot com>
Date: Mon, 6 Aug 2012 04:36:03 -0400
Subject: [Ada] Serial port flow control support

This change adds two new optional parameters to GNAT.Serial_Comminications.Set
to allow the user to specify a local port (no modem control lines), and to
choose a flow control method (none, hardware, software). Note that the
default behaviour is now consistently no flow control on all platforms.
Previously it was the case on Windows only; on Linux, RTS/CTS flow control
was always enabled.

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

2012-08-06  Thomas Quinot  <quinot@adacore.com>

	* g-sercom.adb, g-sercom.ads, g-sercom-mingw.adb, g-sercom-linux.adb
	(Set): Add Local and Flow_Control settings.

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