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[Ada] Give error if both -gnatR and -gnatc given

From: Arnaud Charlet <charlet at adacore dot com>
To: gcc-patches at gcc dot gnu dot org
Cc: Robert Dewar <dewar at adacore dot com>
Date: Tue, 10 Sep 2013 11:06:12 -0400
Subject: [Ada] Give error if both -gnatR and -gnatc given
Authentication-results: sourceware.org; auth=none

The use of -gnatR in check semantics only (-gnatc) mode does not work
since code must be generated for -gnatR to work. The attempt to combine
the two switches is now properly diagnosed. The following trivial package

     1. package gnatrgnatc is
     2. end;

If compiled with switches -gnatc -gnatR2, outputs:

gnat1: -gnatR not permitted since -gnatc given previously

If compiled with switches -gnatR2 -gnatc, outputs:

gnat1: -gnatc not allowed since previous -gnatR given

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

2013-09-10  Robert Dewar  <dewar@adacore.com>

	* gnat_ugn.texi: Document that -gnatc and -gnatR cannot be
	given together.
	* switch-c.adb (Scan_Front_End_Switches): Give error if both
	-gnatR and -gnatc given.

Attachment: difs
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