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[Ada] Allow gnatmake switch -j0

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: Tue, 12 Oct 2010 14:23:52 +0200
Subject: [Ada] Allow gnatmake switch -j0

-j0 is now a valid gnatmake switch. It indicates that the maximum number
simultaneous compilation is the number of available processors.
The test is to invoke gnatmake with -j0. Adding the debugging switch -dm
will display the actual maximum of simultaneous compilations.

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

2010-10-12  Vincent Celier  <celier@adacore.com>

	* debug.adb: For gnatmake, document the meaning of -dm
	* make.adb (Gnatmake): If -dm is used, indicate the maximum number of
	simultaneous compilations.
	* switch-m.adb (Scan_Make_Switches): Allow -j0, meaning as many
	simultaneous compilations as the number of processors.

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