| # Status: Being ported by Steven Watanabe |
| # Base revision: 47077 |
| # |
| # Copyright (c) 2005 Reece H. Dunn. |
| # Copyright 2006 Ilya Sokolov |
| # Copyright (c) 2008 Steven Watanabe |
| # |
| # Use, modification and distribution is subject to the Boost Software |
| # License Version 1.0. (See accompanying file LICENSE_1_0.txt or |
| # http://www.boost.org/LICENSE_1_0.txt) |
| |
| ##### Using Precompiled Headers (Quick Guide) ##### |
| # |
| # Make precompiled mypch.hpp: |
| # |
| # import pch ; |
| # |
| # cpp-pch mypch |
| # : # sources |
| # mypch.hpp |
| # : # requiremnts |
| # <toolset>msvc:<source>mypch.cpp |
| # ; |
| # |
| # Add cpp-pch to sources: |
| # |
| # exe hello |
| # : main.cpp hello.cpp mypch |
| # ; |
| |
| from b2.build import type, feature, generators |
| |
| type.register('PCH', ['pch']) |
| type.register('C_PCH', [], 'PCH') |
| type.register('CPP_PCH', [], 'PCH') |
| |
| # Control precompiled header (PCH) generation. |
| feature.feature('pch', |
| ['on', 'off'], |
| ['propagated']) |
| |
| feature.feature('pch-header', [], ['free', 'dependency']) |
| feature.feature('pch-file', [], ['free', 'dependency']) |
| |
| class PchGenerator(generators.Generator): |
| """ |
| Base PCH generator. The 'run' method has the logic to prevent this generator |
| from being run unless it's being used for a top-level PCH target. |
| """ |
| def action_class(self): |
| return 'compile-action' |
| |
| def run(self, project, name, prop_set, sources): |
| if not name: |
| # Unless this generator is invoked as the top-most generator for a |
| # main target, fail. This allows using 'H' type as input type for |
| # this generator, while preventing Boost.Build to try this generator |
| # when not explicitly asked for. |
| # |
| # One bad example is msvc, where pch generator produces both PCH |
| # target and OBJ target, so if there's any header generated (like by |
| # bison, or by msidl), we'd try to use pch generator to get OBJ from |
| # that H, which is completely wrong. By restricting this generator |
| # only to pch main target, such problem is solved. |
| pass |
| else: |
| r = self.run_pch(project, name, |
| prop_set.add_raw('<define>BOOST_BUILD_PCH_ENABLED'), |
| sources) |
| return generators.add_usage_requirements( |
| r, ['<define>BOOST_BUILD_PCH_ENABLED']) |
| |
| # This rule must be overridden by the derived classes. |
| def run_pch(self, project, name, prop_set, sources): |
| pass |
| |
| #FIXME: dummy-generator in builtins.jam needs to be ported. |
| # NOTE: requirements are empty, default pch generator can be applied when |
| # pch=off. |
| ###generators.register( |
| ### [ new dummy-generator pch.default-c-pch-generator : : C_PCH ] ; |
| ###generators.register |
| ### [ new dummy-generator pch.default-cpp-pch-generator : : CPP_PCH ] ; |