--!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 toolchain
toolchain("llvm")

    -- set homepage
    set_homepage("https://llvm.org/")
    set_description("A collection of modular and reusable compiler and toolchain technologies")

    -- mark as standalone toolchain
    set_kind("standalone")

    -- set toolset
    set_toolset("cc",     "clang")
    set_toolset("cxx",    "clang", "clang++")
    set_toolset("cpp",    "clang -E")
    set_toolset("as",     "clang")
    set_toolset("ld",     "clang++", "clang")
    set_toolset("sh",     "clang++", "clang")
    set_toolset("ar",     "llvm-ar")
    set_toolset("ex",     "llvm-ar")
    set_toolset("ranlib", "llvm-ranlib")
    set_toolset("strip",  "llvm-strip")

    -- check toolchain
    on_check("check")

    -- on load
    on_load(function (toolchain)

        -- add march flags
        local march
        if toolchain:is_plat("windows") and not is_host("windows") then
            -- cross-compilation for windows
            if toolchain:is_arch("i386", "x86") then
                march = "-target i386-pc-windows-msvc"
            else
                march = "-target x86_64-pc-windows-msvc"
            end
            toolchain:add("ldflags", "-fuse-ld=lld")
            toolchain:add("shflags", "-fuse-ld=lld")
        elseif 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

        -- init flags for macOS
        if toolchain:is_plat("macosx") then
            local xcode_dir     = get_config("xcode")
            local xcode_sdkver  = toolchain:config("xcode_sdkver")
            local xcode_sdkdir  = nil
            if xcode_dir and xcode_sdkver then
                xcode_sdkdir = xcode_dir .. "/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX" .. xcode_sdkver .. ".sdk"
                toolchain:add("cxflags", "-isysroot " .. xcode_sdkdir)
                toolchain:add("mxflags", "-isysroot " .. xcode_sdkdir)
                toolchain:add("ldflags", "-isysroot " .. xcode_sdkdir)
                toolchain:add("shflags", "-isysroot " .. xcode_sdkdir)
            else
                -- @see https://github.com/xmake-io/xmake/issues/1179
                local macsdk = "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk"
                if os.exists(macsdk) then
                    toolchain:add("cxflags", "-isysroot " .. macsdk)
                    toolchain:add("mxflags", "-isysroot " .. macsdk)
                    toolchain:add("ldflags", "-isysroot " .. macsdk)
                    toolchain:add("shflags", "-isysroot " .. macsdk)
                end
            end
            toolchain:add("mxflags", "-fobjc-arc")
        end

        -- add bin search library for loading some dependent .dll files windows
        local bindir = toolchain:bindir()
        if bindir and is_host("windows") then
            toolchain:add("runenvs", "PATH", bindir)
        end
    end)