--!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
-- @file        find_gcc.lua
--

-- imports
import("lib.detect.find_program")
import("lib.detect.find_programver")
import("core.cache.detectcache")

-- detect whether the current gcc compiler is clang
function check_clang(program, opt)
    local is_clang = false
    local cachekey = "find_gcc_versioninfo_" .. program
    local versioninfo = detectcache:get(cachekey)
    if versioninfo == nil then
        versioninfo = os.iorunv(program, {"--version"}, {envs = opt.envs})
        detectcache:set(cachekey, versioninfo)
    end
    if versioninfo and versioninfo:find("clang", 1, true) then
        is_clang = true
    end
    return is_clang
end

-- find gcc
--
-- @param opt   the argument options, e.g. {version = true}
--
-- @return      program, version
--
-- @code
--
-- local gcc = find_gcc()
-- local gcc, version, hintname = find_gcc({program = "xcrun -sdk macosx gcc", version = true})
--
-- @endcode
--
function main(opt)
    opt = opt or {}
    opt.norunfile = true
    local program = find_program(opt.program or "gcc", opt)
    local version = nil
    if program and opt.version then
        version = find_programver(program, opt)
    end

    local is_clang = false
    if program and is_host("macosx") then
        is_clang = check_clang(program, opt)
    end
    return program, version, (is_clang and "clang" or "gcc")
end
