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[Ada] New scheme for builder and global compilation switches

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: Wed, 20 Aug 2008 17:43:50 +0200
Subject: [Ada] New scheme for builder and global compilation switches

A new scheme is implemented for gnatmake and gprbuild for the builder and
global compilation switches. When attribute Global_Compilation_Switches
is declared, Default_Switches may not be declared in package Builder, and
Builder'Switches (<main>) cannot include switches not recognized by
gnatmake/gprbuild. Switches ("Ada") is recognized by gnatmake, but cannot
include global compilation switches.

Tested on i686-pc-linux-gnu, committed on trunk

2008-08-20  Vincent Celier  <celier@adacore.com>

	* make.adb (Gnatmake_Switch_Found): New Boolean global variable
	(Switch_May_Be_Passed_To_The_Compiler): New Boolean global variable
	(Add_Switches): New Boolean parameter Unknown_Switches_To_The_Compiler
	 defaulted to True. Fail when Unknown_Switches_To_The_Compiler is False
	and a switch is not recognized by gnatmake.
	(Gnatmake): Implement new scheme for gnatmake switches and global
	compilation switches.
	(Switches_Of): Try successively Switches (<file name>),
	Switches ("Ada"), Switches (others) and Default_Switches ("Ada").

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