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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]
95 lines
2.6 KiB
Plaintext
95 lines
2.6 KiB
Plaintext
# Copyright (c) 2005 Reece H. Dunn.
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# Copyright 2006 Ilya Sokolov
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#
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# Use, modification and distribution is subject to the Boost Software
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# License Version 1.0. (See accompanying file LICENSE_1_0.txt or
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# http://www.boost.org/LICENSE_1_0.txt)
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##### Using Precompiled Headers (Quick Guide) #####
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#
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# Make precompiled mypch.hpp:
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#
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# import pch ;
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#
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# cpp-pch mypch
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# : # sources
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# mypch.hpp
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# : # requiremnts
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# <toolset>msvc:<source>mypch.cpp
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# ;
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#
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# Add cpp-pch to sources:
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#
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# exe hello
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# : main.cpp hello.cpp mypch
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# ;
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import "class" : new ;
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import type ;
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import feature ;
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import generators ;
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type.register PCH : pch ;
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type.register C_PCH : : PCH ;
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type.register CPP_PCH : : PCH ;
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# control precompiled header (PCH) generation
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feature.feature pch :
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on
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off
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;
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feature.feature pch-header : : free dependency ;
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feature.feature pch-file : : free dependency ;
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# Base PCH generator. The 'run' method has the logic to
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# prevent this generator from being run unless it's used
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# in top-level PCH target.
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class pch-generator : generator
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{
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import property-set ;
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rule action-class ( )
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{
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return compile-action ;
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}
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rule run ( project name ? : property-set : sources + )
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{
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if ! $(name)
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{
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# Unless this generator is invoked as the top-most
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# generator for a main target, fail. This allows using
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# 'H' type as input type for this generator, while
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# preventing Boost.Build to try this generator when not
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# explicitly asked for.
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#
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# One bad example is msvc, where pch generator produces
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# both PCH target and OBJ target, so if there's any
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# header generated (like by bison, or by msidl), we'd
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# try to use pch generator to get OBJ from that H, which
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# is completely wrong. By restricting this generator
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# only to pch main target, such problem is solved.
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return [ property-set.empty ] ;
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}
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else
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{
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return [ run-pch $(project) $(name) : $(property-set)
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: $(sources) ] ;
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}
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}
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# This rule must be overridden by the derived classes.
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rule run-pch ( project name ? : property-set : sources + )
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{
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}
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}
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# NOTE: requiremetns are empty,
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# default pch generator can be applied when pch=off
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generators.register [
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new dummy-generator pch.default-c-pch-generator : : C_PCH ] ;
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generators.register [
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new dummy-generator pch.default-cpp-pch-generator : : CPP_PCH ] ;
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