package("libomp")

    set_homepage("https://openmp.llvm.org/")
    set_description("LLVM's OpenMP runtime library.")

    set_urls("https://github.com/llvm/llvm-project/releases/download/llvmorg-$(version)/openmp-$(version).src.tar.xz")
    add_versions("10.0.1", "d19f728c8e04fb1e94566c8d76aef50ec926cd2f95ef3bf1e0a5de4909b28b44")
    add_versions("11.1.0", "d187483b75b39acb3ff8ea1b7d98524d95322e3cb148842957e9b0fbb866052e")
    add_versions("12.0.1", "60fe79440eaa9ebf583a6ea7f81501310388c02754dbe7dc210776014d06b091")
    add_versions("19.1.0", "c036fd95c8eeea8d7bce4196ee20cc5c5a99702d6ec7f0bb19828e315bc3a9ac")

    add_resources("19.1.0", "llvm_cmake", "https://github.com/llvm/llvm-project/releases/download/llvmorg-19.1.0/cmake-19.1.0.src.tar.xz", "dc78b6a9ac8a097ca6ac0f23c06821d65e6ea3bf666026f529994c1d01056ae7")

    if is_plat("mingw", "msys") then
        add_patches("19.1.0", "patches/001-cast-to-make-gcc-happy.patch", "11352ffbe7559a7170f2abd52b3552c877fbcf8fc82cff77b421e8b130a4dd66")
        add_patches("19.1.0", "patches/002-hacks-for-static-linking.patch", "08e39ea52a99204528740196a13cc29daf1b65a6e230fbd7bdd745dde5d11ef3")
    end

    add_configs("shared", {description = "Build shared library.", default = true, type = "boolean"})

    on_fetch("macosx", "linux", function (package, opt)
        if opt.system then
            return package:find_package("system::omp", {includes = "omp.h"}) or package:find_package("system::omp5", {includes = "omp.h"})
        end
    end)

    add_deps("cmake")
    if is_plat("mingw", "msys") then
        add_deps("uasm")
    end

    add_links("omp")

    if is_plat("macosx") then
        add_extsources("brew::libomp")
    elseif is_plat("linux") then
        add_extsources("apt::libomp-dev")
        add_syslinks("pthread", "dl")
    end

    if on_check then
        on_check("android", function (package)
            local ndk = package:toolchain("ndk")
            local ndk_sdkver = ndk:config("ndk_sdkver")
            assert(ndk_sdkver and tonumber(ndk_sdkver) > 25, "package(libomp): need ndk api level > 25")
        end)
    end

    on_load(function (package)
        if package:version():ge("19.0") and package:is_built() then
            package:add("deps", "python 3.x", {kind = "binary"})
        end
    end)

    on_install("macosx", "linux", "cross", "android", "mingw", "msys", "bsd", function (package)
        local version = package:version()
        if version:ge("19.0") then
            local llvm_cmake = package:resourcedir("llvm_cmake")
            local cmake = os.dirs(path.join(llvm_cmake, "*.src"))[1]
            io.gsub("CMakeLists.txt", "set%(LLVM_COMMON_CMAKE_UTILS .-%)", "set(LLVM_COMMON_CMAKE_UTILS \"" .. path.unix(cmake) .. "\")")
            io.replace("CMakeLists.txt", "include(OpenMPTesting)", "function(add_openmp_testsuite target comment)\nreturn()\nendfunction()", {plain = true})
            io.replace("CMakeLists.txt", "construct_check_openmp_target()", "", {plain = true})
            io.replace("runtime/test/CMakeLists.txt", "update_test_compiler_features", "#update_test_compiler_features", {plain = true})
        end

        local configs = {"-DOPENMP_STANDALONE_BUILD=ON", "-DOPENMP_ENABLE_LIBOMPTARGET=OFF", "-DLIBOMP_INSTALL_ALIASES=OFF"}
        local shared = package:config("shared")
        if package:is_plat("mingw", "msys") then
            if package:is_arch("x86_64", "x64") then
                table.insert(configs, "-DLIBOMP_ASMFLAGS=-win64")
            end
            if is_subhost("macosx") then
                table.insert(configs, "-DCMAKE_ASM_MASM_COMPILER=" .. path.join(package:dep("uasm"):installdir("bin"), "uasm"))
                io.replace("runtime/cmake/LibompHandleFlags.cmake", [[/safeseh]], [[-safeseh]], {plain = true})
                io.replace("runtime/cmake/LibompHandleFlags.cmake", [[/coff]], [[-coff]], {plain = true})
            else
                table.insert(configs, "-DCMAKE_ASM_MASM_COMPILER=" .. path.join(package:dep("uasm"):installdir("bin"), "uasm.exe"))
            end
        end
        table.insert(configs, "-DBUILD_SHARED_LIBS=" .. (shared and "ON" or "OFF"))
        table.insert(configs, "-DLIBOMP_ENABLE_SHARED=" .. (shared and "ON" or "OFF"))
        table.insert(configs, "-DLIBOMP_OMPD_GDB_SUPPORT=" .. (package:is_cross() and "OFF" or "ON"))
        import("package.tools.cmake").install(package, configs)
    end)

    on_test(function (package)
        assert(package:has_cfuncs("omp_get_thread_num", {includes = "omp.h"}))
    end)