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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.jam
parentc806a8fff63043f63773874986301f2822a2b552 (diff)
Give in and copy bjam into cdec source code
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+# Copyright (c) 2005 Reece H. Dunn.
+# Copyright 2006 Ilya Sokolov
+#
+# 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
+# ;
+
+import "class" : new ;
+import type ;
+import feature ;
+import 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 ;
+
+# 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.
+class pch-generator : generator
+{
+ import property-set ;
+
+ rule action-class ( )
+ {
+ return compile-action ;
+ }
+
+ rule run ( project name ? : property-set : sources + )
+ {
+ if ! $(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.
+ }
+ else
+ {
+ local r = [ run-pch $(project) $(name)
+ : [ $(property-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.
+ rule run-pch ( project name ? : property-set : sources + )
+ {
+ }
+}
+
+
+# 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 ] ;