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--!A cross-platform build utility based on Lua
--
-- Licensed under the Apache License, Version 2.0 (the "License");
-- you may not use this file except in compliance with the License.
-- You may obtain a copy of the License at
--
-- http://www.apache.org/licenses/LICENSE-2.0
--
-- Unless required by applicable law or agreed to in writing, software
-- distributed under the License is distributed on an "AS IS" BASIS,
-- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-- See the License for the specific language governing permissions and
-- limitations under the License.
--
-- Copyright (C) 2015-present, TBOOX Open Source Group.
--
-- @author ruki
-- @file xmake.lua
--
-- define rule: c++.build.modules
rule("c++.build.modules")
set_extensions(".mpp", ".mxx", ".cppm", ".ixx")
add_deps("c++.build.modules.dependencies")
add_deps("c++.build.modules.builder")
add_deps("c++.build.modules.install")
on_config(function (target)
import("modules_support.common")
-- we disable to build across targets in parallel, because the source files may depend on other target modules
-- @see https://github.com/xmake-io/xmake/issues/1858
if common.contains_modules(target) then
-- @note this will cause cross-parallel builds to be disabled for all sub-dependent targets,
-- even if some sub-targets do not contain C++ modules.
--
-- maybe we will have a more fine-grained configuration strategy to disable it in the future.
target:set("policy", "build.across_targets_in_parallel", false)
-- get modules support
local modules_support = common.modules_support(target)
-- load module support
modules_support.load(target)
-- mark this target with modules
target:data_set("cxx.has_modules", true)
end
end)
-- build dependencies
rule("c++.build.modules.dependencies")
before_buildcmd(function(target, batchcmds, opt)
if target:data("cxx.has_modules") then
import("modules_support.common")
local modules = common.generate_dependencies(target, opt)
target:data_set("cxx.modules", modules)
end
end)
-- build modules
rule("c++.build.modules.builder")
set_sourcekinds("cxx")
set_extensions(".mpp", ".mxx", ".cppm", ".ixx")
before_buildcmd_files(function(target, batchcmds, sourcebatch, opt)
if not target:data("cxx.has_modules") then
sourcebatch.objectfiles = {}
return
end
import("modules_support.common")
import("modules_support.stl_headers")
-- patch sourcebatch
common.patch_sourcebatch(target, sourcebatch, opt)
-- get headerunits info
local headerunits, stl_headerunits = common.get_headerunits(target, sourcebatch)
-- generate headerunits
local headerunits_flags
local modules_support = common.modules_support(target)
-- build stl header units as other headerunits may need them
if stl_headerunits then
headerunits_flags = headerunits_flags or {}
table.join2(headerunits_flags, modules_support.generate_stl_headerunits(target, batchcmds, stl_headerunits, opt))
end
if headerunits then
headerunits_flags = headerunits_flags or {}
table.join2(headerunits_flags, modules_support.generate_user_headerunits(target, batchcmds, headerunits, opt))
end
if headerunits_flags then
target:add("cxxflags", headerunits_flags, {force = true, expand = false})
end
-- topological sort
local modules = target:data("cxx.modules")
local objectfiles = common.sort_modules_by_dependencies(sourcebatch.objectfiles, modules)
modules_support.build_modules(target, batchcmds, objectfiles, modules, opt)
end)
-- install modules
rule("c++.build.modules.install")
set_extensions(".mpp", ".mxx", ".cppm", ".ixx")
before_install(function (target)
import("modules_support.common")
-- we cannot use target:data("cxx.has_modules"),
-- because on_config will be not called when installing targets
if common.contains_modules(target) then
local sourcebatch = target:sourcebatches()["c++.build.modules.install"]
if sourcebatch then
target:add("installfiles", sourcebatch.sourcefiles, {prefixdir = "include"})
end
end
end)
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