--!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, Xmake Open Source Community.
--
-- @author      ruki, romeoxbm
-- @file        toolchain_clang.lua
--

-- define toolchain
function toolchain_clang(version)
    local suffix = version and ("-" .. version) or ""

    toolchain("clang" .. suffix)
        set_kind("standalone")
        set_homepage("https://clang.llvm.org/")
        set_description("A C language family frontend for LLVM" .. (version and (" (" .. version .. ")") or ""))
        set_runtimes("c++_static", "c++_shared", "stdc++_static", "stdc++_shared")

        set_toolset("cc",      "clang" .. suffix)
        set_toolset("cxx",     "clang++" .. suffix, "clang" .. suffix)
        set_toolset("ld",      "clang++" .. suffix, "clang" .. suffix)
        set_toolset("sh",      "clang++" .. suffix, "clang" .. suffix)
        set_toolset("ar",      "llvm-ar" .. suffix, "ar")
        set_toolset("strip",   "llvm-strip" .. suffix, "strip")
        set_toolset("ranlib",  "llvm-ranlib" .. suffix, "ranlib")
        set_toolset("objcopy", "llvm-objcopy" .. suffix, "objcopy")
        set_toolset("nm",      "llvm-nm" .. suffix, "nm")
        set_toolset("mm",      "clang" .. suffix)
        set_toolset("mxx",     "clang++" .. suffix, "clang" .. suffix)
        set_toolset("as",      "clang" .. suffix)
        set_toolset("mrc",     "llvm-rc" .. suffix)
        set_toolset("dlltool", "llvm-dlltool" .. suffix)
        if is_host("macosx") then
            set_toolset("dsymutil", "dsymutil")
        end

        on_check(function (toolchain)
            if toolchain:is_plat("windows") then
                local rootdir = path.join(path.directory(os.scriptdir()), "clang")
                local result = import("check", {rootdir = rootdir})(toolchain, suffix)
                if result then
                    return result
                end
            end

            return import("lib.detect.find_tool")("clang", {program = "clang" .. suffix})
        end)

        on_load(function (toolchain)
            import("core.project.project")

            if project.policy("build.optimization.lto") then
                toolchain:set("toolset", "ar",  "llvm-ar" .. suffix)
                toolchain:set("toolset", "ranlib",  "llvm-ranlib" .. suffix)
            end

            local march
            if toolchain:is_arch("x86_64", "x64") then
                march = "-m64"
            elseif toolchain:is_arch("i386", "x86") then
                march = "-m32"
            end
            if march then
                toolchain:add("cxflags", march)
                toolchain:add("mxflags", march)
                toolchain:add("asflags", march)
                toolchain:add("ldflags", march)
                toolchain:add("shflags", march)
            end
            if toolchain:is_plat("windows") then
                toolchain:add("runtimes", "MT", "MTd", "MD", "MDd")
            end
            if toolchain:is_plat("windows", "mingw") then
                local rootdir = path.join(path.directory(os.scriptdir()), "clang")
                import("load", {rootdir = rootdir})(toolchain, suffix)
            end
        end)
end
