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# 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 ] ;
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