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Diffstat (limited to 'tools/build/v2/tools/zlib.jam')
| -rw-r--r-- | tools/build/v2/tools/zlib.jam | 92 |
1 files changed, 92 insertions, 0 deletions
diff --git a/tools/build/v2/tools/zlib.jam b/tools/build/v2/tools/zlib.jam new file mode 100644 index 0000000000..f9138fd573 --- /dev/null +++ b/tools/build/v2/tools/zlib.jam @@ -0,0 +1,92 @@ +# Copyright (c) 2010 Vladimir Prus. +# +# 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) + +# Supports the zlib library +# +# After 'using zlib', the following targets are available: +# +# /zlib//zlib -- The zlib library + + +# In addition to direct purpose of supporting zlib, this module also +# serves as canonical example of how third-party condiguration works +# in Boost.Build. The operation is as follows +# +# - For each 'using zlib : condition ... : ...' we create a target alternative +# for zlib, with the specified condition. +# - There's one target alternative for 'zlib' with no specific condition +# properties. +# +# Two invocations of 'using zlib' with the same condition but different +# properties are not permitted, e.g.: +# +# using zlib : condition <target-os>windows : include foo ; +# using zlib : condition <target-os>windows : include bar ; +# +# is in error. One exception is for empty condition, 'using' without any +# parameters is overridable. That is: +# +# using zlib ; +# using zlib : include foo ; +# +# Is OK then the first 'using' is ignored. Likewise if the order of the statements +# is reversed. +# +# When 'zlib' target is built, a target alternative is selected as usual for +# Boost.Build. The selected alternative is a custom target class, which: +# +# - calls ac.find-include-path to find header path. If explicit path is provided +# in 'using', only that path is checked, and if no header is found there, error +# is emitted. Otherwise, we check a directory specified using ZLIB_INCLUDE +# environment variable, and failing that, in standard directories. +# [TODO: document sysroot handling] +# - calls ac.find-library to find the library, in an identical fashion. +# + +import project ; +import ac ; +import errors ; +import "class" : new ; +import targets ; + +project.initialize $(__name__) ; +project = [ project.current ] ; +project zlib ; + +header = zlib.h ; +names = z zlib zll zdll ; + +.default-alternative = [ new ac-library zlib : $(project) ] ; +$(.default-alternative).set-header $(header) ; +$(.default-alternative).set-default-names $(names) ; +targets.main-target-alternative $(.default-alternative) ; + +rule init ( * : * ) +{ + if ! $(condition) + { + # Special case the no-condition case so that 'using' without parameters + # can mix with more specific 'using'. + $(.default-alternative).reconfigure $(1) : $(2) : $(3) : $(4) : $(5) : $(6) : $(7) : $(8) : $(9) ; + } + else + { + # FIXME: consider if we should allow overriding definitions for a given + # condition -- e.g. project-config.jam might want to override whatever is + # in user-config.jam. + local mt = [ new ac-library zlib : $(project) + : $(1) : $(2) : $(3) : $(4) : $(5) : $(6) : $(7) : $(8) : $(9) ] ; + $(mt).set-header $(header) ; + $(mt).set-default-names $(names) ; + targets.main-target-alternative $(mt) ; + } +} + + + + + + |