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[Ada] --RTS= specified several times for same runtime directory

From: Arnaud Charlet <charlet at adacore dot com>
To: gcc-patches at gcc dot gnu dot org
Cc: Vincent Celier <celier at adacore dot com>
Date: Fri, 20 Feb 2015 04:51:35 -0500
Subject: [Ada] --RTS= specified several times for same runtime directory
Authentication-results: sourceware.org; auth=none

When the compiler is invoked with several --RTS= switches, with different
values designated the same runtime directory, the compiler reports an
error that RTS cannot be specified several times. This patch fixes
this problem.
The test for this is to invoke the compiler with two switches --RTS=, one
with the full path of the runtime directory, the other with the runtime
name.
Example:
gcc -c --RTS=/full/path/rts-sjlj/ --RTS=toto main.adb

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

2015-02-20  Vincent Celier  <celier@adacore.com>

	* switch-c.adb (Scan_Front_End_Switches): Do not fail when --RTS=
	is specified several times with different values that indicates
	the same runtime directory.

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