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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, Arthapz
-- @file xmake.lua
--
-- define rule: c++.build.modules
rule("c++.build.modules")
-- @note common.contains_modules() need it
set_extensions(".cppm", ".ccm", ".cxxm", ".c++m", ".mpp", ".mxx", ".ixx")
add_deps("c++.build.modules.builder")
add_deps("c++.build.modules.install")
on_config(function (target)
import("support")
-- 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 support.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.fence", true)
-- 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)
-- load compiler support
support.load(target)
-- mark this target with modules
target:data_set("cxx.has_modules", true)
-- moduleonly modules are implicitly public
if target:is_moduleonly() then
local sourcebatch = target:sourcebatches()["c++.build.modules.builder"]
if sourcebatch then
for _, sourcefile in ipairs(sourcebatch.sourcefiles) do
target:fileconfig_add(sourcefile, {public = true})
end
end
end
end
end)
-- build modules
rule("c++.build.modules.builder")
set_sourcekinds("cxx")
set_extensions(".mpp", ".mxx", ".cppm", ".ixx")
-- generate module dependencies
on_prepare_files(function (target, jobgraph, sourcebatch, opt)
if target:data("cxx.has_modules") then
import("builder")
import("scanner")
-- patch sourcebatch
builder.patch_sourcebatch(target, sourcebatch)
-- generate module dependencies
scanner.generate_module_dependencies(target, jobgraph, sourcebatch, opt)
end
end, {jobgraph = true})
-- parallel build support to accelerate `xmake build` to build modules
before_build_files(function(target, jobgraph, sourcebatch, opt)
if target:data("cxx.has_modules") then
import("support")
import("scanner")
import("builder")
-- get module dependencies
local modules = scanner.get_module_dependencies(target, sourcebatch)
if not target:is_moduleonly() then
-- avoid building non referenced modules
local build_objectfiles, link_objectfiles = scanner.sort_modules_by_dependencies(target, sourcebatch.objectfiles, modules)
sourcebatch.objectfiles = build_objectfiles
-- build modules and headerunits
builder.build_modules_and_headerunits(target, jobgraph, sourcebatch, modules, opt)
sourcebatch.objectfiles = link_objectfiles
else
sourcebatch.objectfiles = {}
end
support.localcache():set2(target:fullname(), "c++.modules", modules)
support.localcache():save()
else
-- avoid duplicate linking of object files of non-module programs
sourcebatch.objectfiles = {}
end
end, {jobgraph = true, 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("support")
import("scanner")
import("builder")
-- get module dependencies
local modules = scanner.get_module_dependencies(target, sourcebatch)
if not target:is_moduleonly() then
-- avoid building non referenced modules
local build_objectfiles, link_objectfiles = scanner.sort_modules_by_dependencies(target, sourcebatch.objectfiles, modules)
sourcebatch.objectfiles = build_objectfiles
-- build headerunits and modules
builder.build_modules_and_headerunits(target, batchcmds, sourcebatch, modules, opt)
sourcebatch.objectfiles = link_objectfiles
else
-- avoid duplicate linking of object files of non-module programs
sourcebatch.objectfiles = {}
end
support.localcache():set2(target:fullname(), "c++.modules", modules)
support.localcache():save()
else
sourcebatch.sourcefiles = {}
sourcebatch.objectfiles = {}
sourcebatch.dependfiles = {}
end
end)
after_clean(function (target)
import("core.base.option")
import("support")
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 support.contains_modules(target) then
remove_files(support.modules_cachedir(target))
if option.get("all") then
remove_files(support.stlmodules_cachedir(target))
support.localcache():clear()
support.localcache():save()
end
end
end)
-- install modules
rule("c++.build.modules.install")
set_extensions(".mpp", ".mxx", ".cppm", ".ixx")
before_install(function (target)
import("support")
import("builder")
-- we cannot use target:data("cxx.has_modules"),
-- because on_config will be not called when installing targets
if support.contains_modules(target) then
local modules = support.localcache():get2(target:fullname(), "c++.modules")
builder.generate_metadata(target, modules)
support.add_installfiles_for_modules(target)
end
end)
before_uninstall(function (target)
import("support")
if support.contains_modules(target) then
support.add_installfiles_for_modules(target)
end
end)
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