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Vladimir Prus 76d041d7c1 Implement precompiled headers on gcc and improve same on msvc.

Notable changes:
1. There's no need to cast header to the PCHHEADER type.
2. There are two separate type "C_PCH" and "CPP_PCH", that
use C and C++ compilation respectively.

Most of the patch sumbitted by Ilya Sokolov.

	tools/
	* builtin.jam (class dummy-generator): New.
	* gcc.jam: Override extension of the PCH type.
	(class gcc-pch-generator): New.
	Register generators for C_PCH and CPP_PCH.
	(compile.c++.pch, compile.c.pch): New.
	* msvc.jam (class msvc-pch-generator): New.
	Register generators for C_PCH and CPP_PCH.
	* pch.jam: Remove 'PCHHEADER' type.
	(pch-generator): Fail unlress it's used at top-level
	generator.
	Register catch-all produce-nothing generators for PCH-less
	toolsets.


[SVN r35508]

2006-10-07 09:31:19 +00:00