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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")
-- @note common.contains_modules() need it
set_extensions(".mpp", ".mxx", ".cppm", ".ixx")
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)
-- disable ccache for this target
--
-- Caching can affect incremental compilation, for example
-- by interfering with the results of depfile generation for msvc.
--
-- @see https://github.com/xmake-io/xmake/issues/3000
target:set("policy", "build.ccache", 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 modules
rule("c++.build.modules.builder")
set_sourcekinds("cxx")
set_extensions(".mpp", ".mxx", ".cppm", ".ixx")
-- parallel build support to accelerate `xmake build` to build modules
before_build_files(function(target, batchjobs, sourcebatch, opt)
if target:data("cxx.has_modules") then
import("modules_support.common")
common.patch_sourcebatch(target, sourcebatch, opt)
local modules = common.get_module_dependencies(target, sourcebatch, opt)
-- extract packages modules dependencies
local package_modules_data = common.get_all_package_modules(target, modules, opt)
if package_modules_data then
-- cull unused modules
package_modules_data = common.cull_unused_modules(target, modules, package_modules_data)
if package_modules_data then
-- append to sourcebatch
for name, package_module_data in pairs(package_modules_data) do
table.insert(sourcebatch.sourcefiles, package_module_data.file)
end
-- we need to repatch and regenerate dependencies at this point
common.patch_sourcebatch(target, sourcebatch, opt)
opt.regenerate = true
modules = common.get_module_dependencies(target, sourcebatch, opt)
end
end
-- build modules
common.build_modules_for_batchjobs(target, batchjobs, sourcebatch, modules, opt)
-- generate headerunits and we need to do it before building modules
local user_headerunits, stl_headerunits = common.get_headerunits(target, sourcebatch, modules)
if user_headerunits or stl_headerunits then
-- we need new group(headerunits)
-- e.g. group(build_modules) -> group(headerunits)
opt.rootjob = batchjobs:group_leave() or opt.rootjob
batchjobs:group_enter(target:name() .. "/generate_headerunits", {rootjob = opt.rootjob})
local modules_support = common.modules_support(target)
if stl_headerunits then
-- build stl header units as other headerunits may need them
-- TODO maybe we need new group(build_modules) -> group(user_headerunits) -> group(stl_headerunits)
modules_support.generate_stl_headerunits_for_batchjobs(target, batchjobs, stl_headerunits, opt)
end
if user_headerunits then
modules_support.generate_user_headerunits_for_batchjobs(target, batchjobs, user_headerunits, opt)
end
end
else
-- avoid duplicate linking of object files of non-module programs
sourcebatch.objectfiles = {}
end
end, {batch = true})
-- serial compilation only, usually used to support project generator
before_buildcmd_files(function(target, batchcmds, sourcebatch, opt)
if target:data("cxx.has_modules") then
import("modules_support.common")
-- patch sourcebatch
common.patch_sourcebatch(target, sourcebatch, opt)
-- generate headerunits
local modules = common.get_module_dependencies(target, sourcebatch, opt)
common.generate_headerunits_for_batchcmds(target, batchcmds, sourcebatch, modules, opt)
-- build modules
common.build_modules_for_batchcmds(target, batchcmds, sourcebatch, modules, opt)
else
-- avoid duplicate linking of object files of non-module programs
sourcebatch.objectfiles = {}
end
end)
before_link(function (target)
import("modules_support.common")
if target:data("cxx.has_modules") then
common.append_dependency_objectfiles(target)
end
end)
after_clean(function (target)
import("core.base.option")
import("modules_support.common")
import("private.action.clean.remove_files")
-- we cannot use target:data("cxx.has_modules"),
-- because on_config will be not called when cleaning targets
if common.contains_modules(target) then
remove_files(common.modules_cachedir(target))
if option.get("all") then
remove_files(common.stlmodules_cachedir(target))
common.localcache():clear()
common.localcache():save()
end
end
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
common.install_module_target(target)
end
end)
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