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authorKenneth Heafield <github@kheafield.com>2012-05-12 14:01:52 -0400
committerKenneth Heafield <github@kheafield.com>2012-05-12 14:01:52 -0400
commit3faecf9a00512dcbc8712c4bca9adae72fb64410 (patch)
tree9761b50d12f81a675fb7cbc663ceebad15079f78 /jam-files/boost-build/tools/pch.py
parentc806a8fff63043f63773874986301f2822a2b552 (diff)
Give in and copy bjam into cdec source code
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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 ] ;