moz.configure

# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
# vim: set filetype=python:
# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.

include("build/moz.configure/init.configure")

# Note:
# - Gecko-specific options and rules should go in toolkit/moz.configure.
# - Firefox-specific options and rules should go in browser/moz.configure.
# - Fennec-specific options and rules should go in
#   mobile/android/moz.configure.
# - Spidermonkey-specific options and rules should go in js/moz.configure.
# - etc.

option(
    "--enable-artifact-builds",
    env="MOZ_ARTIFACT_BUILDS",
    help="Download and use prebuilt binary artifacts.",
)


@depends("--enable-artifact-builds")
def artifact_builds(value):
    if value:
        return True


set_config("MOZ_ARTIFACT_BUILDS", artifact_builds)

imply_option(
    "--enable-artifact-build-symbols",
    depends(artifact_builds)(lambda v: False if v is None else None),
    reason="--disable-artifact-builds",
)

option(
    "--enable-artifact-build-symbols",
    nargs="?",
    choices=("full",),
    help="Download symbols when artifact builds are enabled.",
)


@depends("--enable-artifact-build-symbols", "MOZ_AUTOMATION", target)
def enable_artifact_build_symbols(value, automation, target):
    if len(value):
        return value[0]
    if bool(value):
        if target.os == "Android" and not automation:
            return "full"
        return True
    return None


set_config("MOZ_ARTIFACT_BUILD_SYMBOLS", enable_artifact_build_symbols)


@depends("--enable-artifact-builds")
def imply_disable_compile_environment(value):
    if value:
        return False


option(
    env="MOZ_COPY_PDBS",
    help="For builds that do not support symbols in the normal fashion,"
    " generate and copy them into the resulting build archive.",
)

set_config("MOZ_COPY_PDBS", depends_if("MOZ_COPY_PDBS")(lambda _: True))

imply_option("--enable-compile-environment", imply_disable_compile_environment)

option("--disable-compile-environment", help="Disable compiler/library checks")


@depends("--disable-compile-environment")
def compile_environment(compile_env):
    if compile_env:
        return True


set_config("COMPILE_ENVIRONMENT", compile_environment)
add_old_configure_assignment("COMPILE_ENVIRONMENT", compile_environment)

option("--disable-tests", help="Do not build test libraries & programs")


@depends("--disable-tests")
def enable_tests(value):
    if value:
        return True


set_config("ENABLE_TESTS", enable_tests)
set_define("ENABLE_TESTS", enable_tests)


@depends(enable_tests)
def gtest_has_rtti(value):
    if value:
        return "0"


set_define("GTEST_HAS_RTTI", gtest_has_rtti)


@depends(target, enable_tests)
def linux_gtest_defines(target, enable_tests):
    if enable_tests and target.os == "Android":
        return namespace(os_linux_android=True, use_own_tr1_tuple=True, has_clone="0")


set_define("GTEST_OS_LINUX_ANDROID", linux_gtest_defines.os_linux_android)
set_define("GTEST_USE_OWN_TR1_TUPLE", linux_gtest_defines.use_own_tr1_tuple)
set_define("GTEST_HAS_CLONE", linux_gtest_defines.has_clone)

option(
    "--enable-debug",
    nargs="?",
    help="Enable building with developer debug info "
    "(using the given compiler flags).",
)


@depends("--enable-debug")
def moz_debug(debug):
    if debug:
        return bool(debug)


set_config("MOZ_DEBUG", moz_debug)
set_define("MOZ_DEBUG", moz_debug)
# Override any value MOZ_DEBUG may have from the environment when passing it
# down to old-configure.
add_old_configure_assignment("MOZ_DEBUG", depends("--enable-debug")(lambda x: bool(x)))

option(
    "--with-debug-label",
    nargs="+",
    help="Debug DEBUG_<value> for each comma-separated value given",
)


@depends(moz_debug, "--with-debug-label")
def debug_defines(debug, labels):
    if debug:
        return ["DEBUG"] + ["DEBUG_%s" % label for label in labels]
    return ["NDEBUG", "TRIMMED"]


set_config("MOZ_DEBUG_DEFINES", debug_defines)

option(env="MOZ_PGO", help="Build with profile guided optimizations")

set_config("MOZ_PGO", depends("MOZ_PGO")(lambda x: bool(x)))


imply_option("--enable-release", mozilla_official)
imply_option("--enable-release", depends_if("MOZ_AUTOMATION")(lambda x: True))

option(
    "--enable-release",
    default=milestone.is_release_or_beta,
    help="{Build|Do not build} with more conservative, release "
    "engineering-oriented options.{ This may slow down builds.|}",
)


@depends("--enable-release")
def developer_options(value):
    if not value:
        return True


add_old_configure_assignment("DEVELOPER_OPTIONS", developer_options)
set_config("DEVELOPER_OPTIONS", developer_options)


option(
    env="MOZ_FETCHES_DIR",
    nargs=1,
    when="MOZ_AUTOMATION",
    help="Directory containing fetched artifacts",
)


@depends("MOZ_FETCHES_DIR", when="MOZ_AUTOMATION")
def moz_fetches_dir(value):
    if value:
        return value[0]


@depends(vcs_checkout_type, milestone.is_nightly, "MOZ_AUTOMATION")
def bootstrap_default(vcs_checkout_type, is_nightly, automation):
    if automation:
        return False
    # We only enable if building off a VCS checkout of central.
    if is_nightly and vcs_checkout_type:
        return True


option(
    "--enable-bootstrap",
    default=bootstrap_default,
    help="{Automatically bootstrap or update some toolchains|Disable bootstrap or update of toolchains}",
)


@depends(developer_options, "--enable-bootstrap", moz_fetches_dir)
def bootstrap_search_path_order(developer_options, bootstrap, moz_fetches_dir):
    if moz_fetches_dir:
        log.debug("Prioritizing MOZ_FETCHES_DIR in toolchain path.")
        return "prepend"

    if bootstrap:
        log.debug(
            "Prioritizing mozbuild state dir in toolchain paths because "
            "bootstrap mode is enabled."
        )
        return "prepend"

    if developer_options:
        log.debug(
            "Prioritizing mozbuild state dir in toolchain paths because "
            "you are not building in release mode."
        )
        return "prepend"

    log.debug(
        "Prioritizing system over mozbuild state dir in "
        "toolchain paths because you are building in "
        "release mode."
    )
    return "append"


toolchains_base_dir = moz_fetches_dir | mozbuild_state_path


@dependable
@imports("os")
@imports(_from="os", _import="environ")
def original_path():
    return environ["PATH"].split(os.pathsep)


@depends(host, when="--enable-bootstrap")
@imports("os")
@imports(_from="mozbuild.toolchains", _import="toolchain_task_definitions")
@imports(_from="__builtin__", _import="Exception")
def bootstrap_toolchain_tasks(host):
    prefix = {
        ("x86_64", "GNU", "Linux"): "linux64",
        ("x86_64", "OSX", "Darwin"): "macosx64",
        ("aarch64", "OSX", "Darwin"): "macosx64-aarch64",
        ("x86_64", "WINNT", "WINNT"): "win64",
    }.get((host.cpu, host.os, host.kernel))
    try:
        return namespace(prefix=prefix, tasks=toolchain_task_definitions())
    except Exception:
        return None


@template
def bootstrap_path(path, **kwargs):
    when = kwargs.pop("when", None)
    if kwargs:
        configure_error("bootstrap_path only takes `when` as a keyword argument")

    @depends(
        "--enable-bootstrap",
        toolchains_base_dir,
        bootstrap_toolchain_tasks,
        shell,
        check_build_environment,
        dependable(path),
        when=when,
    )
    @imports("os")
    @imports("subprocess")
    @imports(_from="mozbuild.util", _import="ensureParentDir")
    @imports(_from="__builtin__", _import="open")
    @imports(_from="__builtin__", _import="Exception")
    def bootstrap_path(bootstrap, toolchains_base_dir, tasks, shell, build_env, path):
        path_parts = path.split("/")

        def try_bootstrap(exists):
            if not tasks:
                return False
            prefixes = [""]
            if tasks.prefix:
                prefixes.insert(0, "{}-".format(tasks.prefix))
            for prefix in prefixes:
                label = "toolchain-{}{}".format(prefix, path_parts[0])
                task = tasks.tasks.get(label)
                if task:
                    break
            log.debug("Trying to bootstrap %s", label)
            if not task:
                return False
            task_index = task.optimization.get("index-search")
            if not task_index:
                return False
            log.debug("Resolved %s to %s", label, task_index[0])
            task_index = task_index[0].split(".")[-1]
            artifact = task.attributes["toolchain-artifact"]
            # `mach artifact toolchain` doesn't support authentication for
            # private artifacts.
            if not artifact.startswith("public/"):
                log.debug("Cannot bootstrap %s: not a public artifact", label)
                return False
            index_file = os.path.join(toolchains_base_dir, "indices", path_parts[0])
            try:
                with open(index_file) as fh:
                    index = fh.read().strip()
            except Exception:
                index = None
            if index == task_index and exists:
                log.debug("%s is up-to-date", label)
                return True
            log.info(
                "%s bootstrapped toolchain in %s",
                "Updating" if exists else "Installing",
                os.path.join(toolchains_base_dir, path_parts[0]),
            )
            subprocess.run(
                [
                    shell,
                    os.path.join(build_env.topsrcdir, "mach"),
                    "--log-no-times",
                    "artifact",
                    "toolchain",
                    "--from-build",
                    label,
                ],
                cwd=toolchains_base_dir,
                check=True,
            )
            ensureParentDir(index_file)
            with open(index_file, "w") as fh:
                fh.write(task_index)
            return True

        path = os.path.join(toolchains_base_dir, *path_parts)
        if bootstrap:
            try:
                if not try_bootstrap(os.path.exists(path)):
                    # If there aren't toolchain artifacts to use for this build,
                    # don't return a path.
                    return None
            except Exception as e:
                log.error("%s", e)
                die("If you can't fix the above, retry with --disable-bootstrap.")
        # We re-test whether the path exists because it may have been created by
        # try_bootstrap. Automation will not have gone through the bootstrap
        # process, but we want to return the path if it exists.
        if os.path.exists(path):
            return path

    return bootstrap_path


@template
def bootstrap_search_path(path, paths=original_path, **kwargs):
    @depends(
        bootstrap_path(path, **kwargs),
        bootstrap_search_path_order,
        paths,
        original_path,
    )
    def bootstrap_search_path(path, order, paths, original_path):
        if paths is None:
            paths = original_path
        if not path:
            return paths
        if order == "prepend":
            return [path] + paths
        return paths + [path]

    return bootstrap_search_path


# The execution model of the configure sandbox doesn't allow for
# check_prog to use bootstrap_search_path directly because check_prog
# comes first, so we use a trick to allow it. No use of check_prog
# happening before here won't allow bootstrap.
@template
def check_prog(*args, **kwargs):
    kwargs["bootstrap_search_path"] = bootstrap_search_path
    return check_prog(*args, **kwargs)


@depends(target, host)
def want_wine(target, host):
    return target.kernel == "WINNT" and host.kernel != "WINNT"


wine = check_prog(
    "WINE",
    ["wine64", "wine"],
    allow_missing=True,
    when=want_wine,
    bootstrap="wine/bin",
)
check_prog("WGET", ("wget",), allow_missing=True)


include("build/moz.configure/toolchain.configure", when="--enable-compile-environment")

include("build/moz.configure/pkg.configure")
# Make this assignment here rather than in pkg.configure to avoid
# requiring this file in unit tests.
add_old_configure_assignment("PKG_CONFIG", pkg_config)

include("build/moz.configure/memory.configure", when="--enable-compile-environment")
include("build/moz.configure/headers.configure", when="--enable-compile-environment")
include("build/moz.configure/warnings.configure", when="--enable-compile-environment")
include("build/moz.configure/flags.configure", when="--enable-compile-environment")
include("build/moz.configure/lto-pgo.configure", when="--enable-compile-environment")
# rust.configure is included by js/moz.configure.

option("--enable-valgrind", help="Enable Valgrind integration hooks")

valgrind_h = check_header("valgrind/valgrind.h", when="--enable-valgrind")


@depends("--enable-valgrind", valgrind_h)
def check_valgrind(valgrind, valgrind_h):
    if valgrind:
        if not valgrind_h:
            die("--enable-valgrind specified but Valgrind is not installed")
        return True


set_define("MOZ_VALGRIND", check_valgrind)
set_config("MOZ_VALGRIND", check_valgrind)


@depends(target, host)
def is_openbsd(target, host):
    return target.kernel == "OpenBSD" or host.kernel == "OpenBSD"


option(
    env="SO_VERSION",
    nargs=1,
    default="1.0",
    when=is_openbsd,
    help="Shared library version for OpenBSD systems",
)


@depends("SO_VERSION", when=is_openbsd)
def so_version(value):
    return value


@template
def library_name_info_template(host_or_target):
    assert host_or_target in {host, target}
    compiler = {
        host: host_c_compiler,
        target: c_compiler,
    }[host_or_target]

    @depends(host_or_target, compiler, so_version)
    def library_name_info_impl(host_or_target, compiler, so_version):
        if host_or_target.kernel == "WINNT":
            # There aren't artifacts for mingw builds, so it's OK that the
            # results are inaccurate in that case.
            if compiler and compiler.type != "clang-cl":
                return namespace(
                    dll=namespace(prefix="", suffix=".dll"),
                    lib=namespace(prefix="lib", suffix="a"),
                    import_lib=namespace(prefix="lib", suffix="a"),
                    obj=namespace(prefix="", suffix="o"),
                )

            return namespace(
                dll=namespace(prefix="", suffix=".dll"),
                lib=namespace(prefix="", suffix="lib"),
                import_lib=namespace(prefix="", suffix="lib"),
                obj=namespace(prefix="", suffix="obj"),
            )

        elif host_or_target.kernel == "Darwin":
            return namespace(
                dll=namespace(prefix="lib", suffix=".dylib"),
                lib=namespace(prefix="lib", suffix="a"),
                import_lib=namespace(prefix=None, suffix=""),
                obj=namespace(prefix="", suffix="o"),
            )
        elif so_version:
            so = ".so.%s" % so_version
        else:
            so = ".so"

        return namespace(
            dll=namespace(prefix="lib", suffix=so),
            lib=namespace(prefix="lib", suffix="a"),
            import_lib=namespace(prefix=None, suffix=""),
            obj=namespace(prefix="", suffix="o"),
        )

    return library_name_info_impl


host_library_name_info = library_name_info_template(host)
library_name_info = library_name_info_template(target)

set_config("DLL_PREFIX", library_name_info.dll.prefix)
set_config("DLL_SUFFIX", library_name_info.dll.suffix)
set_config("HOST_DLL_PREFIX", host_library_name_info.dll.prefix)
set_config("HOST_DLL_SUFFIX", host_library_name_info.dll.suffix)
set_config("LIB_PREFIX", library_name_info.lib.prefix)
set_config("LIB_SUFFIX", library_name_info.lib.suffix)
set_config("OBJ_SUFFIX", library_name_info.obj.suffix)
# Lots of compilation tests depend on this variable being present.
add_old_configure_assignment("OBJ_SUFFIX", library_name_info.obj.suffix)
set_config("IMPORT_LIB_SUFFIX", library_name_info.import_lib.suffix)
set_define(
    "MOZ_DLL_PREFIX", depends(library_name_info.dll.prefix)(lambda s: '"%s"' % s)
)
set_define(
    "MOZ_DLL_SUFFIX", depends(library_name_info.dll.suffix)(lambda s: '"%s"' % s)
)
set_config("WASM_OBJ_SUFFIX", "wasm")

# Make `profiling` available to this file even when js/moz.configure
# doesn't end up included.
profiling = dependable(False)
# Same for js_standalone
js_standalone = dependable(False)
# Same for fold_libs
fold_libs = dependable(False)

include(include_project_configure)


@depends("--help")
@imports(_from="mozbuild.backend", _import="backends")
def build_backends_choices(_):
    return tuple(backends)


@deprecated_option("--enable-build-backend", nargs="+", choices=build_backends_choices)
def build_backend(backends):
    if backends:
        return tuple("+%s" % b for b in backends)


imply_option("--build-backends", build_backend)


@depends(
    "--enable-artifact-builds",
    "--disable-compile-environment",
    "--enable-build-backend",
    "--enable-project",
    "--enable-application",
    "--help",
)
@imports("sys")
def build_backend_defaults(
    artifact_builds, compile_environment, requested_backends, project, application, _
):
    if application:
        project = application[0]
    elif project:
        project = project[0]

    if "Tup" in requested_backends:
        # As a special case, if Tup was requested, do not combine it with any
        # Make based backend by default.
        all_backends = []
    elif artifact_builds:
        all_backends = ["FasterMake+RecursiveMake"]
    else:
        all_backends = ["RecursiveMake", "FasterMake"]
    # Normally, we'd use target.os == 'WINNT', but a dependency on target
    # would require target to depend on --help, as well as host and shell,
    # and this is not a can of worms we can open at the moment.
    if (
        sys.platform == "win32"
        and compile_environment
        and project not in ("mobile/android", "memory", "tools/update-programs")
    ):
        all_backends.append("VisualStudio")
    return tuple(all_backends) or None


option(
    "--build-backends",
    nargs="+",
    default=build_backend_defaults,
    choices=build_backends_choices,
    help="Build backends to generate",
)


@depends("--build-backends")
def build_backends(backends):
    return backends


set_config("BUILD_BACKENDS", build_backends)


@depends(check_build_environment, build_backends)
@imports("glob")
def check_objdir_backend_reuse(build_env, backends):
    # "Make based" might be RecursiveMake or a hybrid backend, so "Make" is
    # intentionally vague for use with the substring match below.
    incompatible_backends = (("Tup", "Make"), ("Make", "Tup"))
    for backend_file in glob.iglob(
        os.path.join(build_env.topobjdir, "backend.*Backend")
    ):
        for prev, curr in incompatible_backends:
            if prev in backend_file and any(curr in b for b in backends):
                die(
                    "The active objdir, %s, was previously "
                    "used to build with a %s based backend. "
                    "Change objdirs (by setting MOZ_OBJDIR in "
                    "your mozconfig) or clobber to continue.\n",
                    build_env.topobjdir,
                    prev,
                )


# Determine whether to build the gtest xul. This happens in automation
# on Android and Desktop platforms with the exception of:
#  - Windows PGO, where linking xul-gtest.dll takes too long;
#  - Android other than x86_64, where gtest is not required.
@depends(
    "MOZ_PGO",
    build_project,
    target,
    "MOZ_AUTOMATION",
    enable_tests,
    when="--enable-compile-environment",
)
def build_gtest(pgo, build_project, target, automation, enable_tests):
    return bool(
        enable_tests
        and automation
        and build_project in ("browser", "comm/mail", "mobile/android")
        and not (
            (pgo and target.os == "WINNT")
            or (target.os == "Android" and target.cpu != "x86_64")
        )
    )


option(
    "--enable-gtest-in-build",
    default=build_gtest,
    help="{Enable|Force disable} building the gtest libxul during the build.",
    when="--enable-compile-environment",
)

set_config("LINK_GTEST_DURING_COMPILE", True, when="--enable-gtest-in-build")

# Localization
# ==============================================================
option(
    "--enable-ui-locale",
    default="en-US",
    help="Select the user interface locale (default: en-US)",
)

set_config("MOZ_UI_LOCALE", depends("--enable-ui-locale")(lambda x: x))

# clang-plugin location
# ==============================================================


@depends(host_library_name_info, check_build_environment, when="--enable-clang-plugin")
def clang_plugin_path(library_name_info, build_env):
    topobjdir = build_env.topobjdir
    if topobjdir.endswith("/js/src"):
        topobjdir = topobjdir[:-7]
    return os.path.abspath(
        os.path.join(
            topobjdir,
            "build",
            "clang-plugin",
            "%sclang-plugin%s"
            % (library_name_info.dll.prefix, library_name_info.dll.suffix),
        )
    )


set_config("CLANG_PLUGIN", clang_plugin_path)
add_old_configure_assignment("CLANG_PLUGIN", clang_plugin_path)


# Awk detection
# ==============================================================
awk = check_prog("AWK", ("gawk", "mawk", "nawk", "awk"))

# Until the AWK variable is not necessary in old-configure


@depends(awk)
def awk_for_old_configure(value):
    return value


add_old_configure_assignment("AWK", awk_for_old_configure)


# Perl detection
# ==============================================================
perl = check_prog("PERL", ("perl5", "perl"))

# Until the PERL variable is not necessary in old-configure


@depends(perl)
def perl_for_old_configure(value):
    return value


add_old_configure_assignment("PERL", perl_for_old_configure)


@template
def perl_version_check(min_version):
    @depends(perl)
    @checking("for minimum required perl version >= %s" % min_version)
    def get_perl_version(perl):
        return Version(
            check_cmd_output(
                perl,
                "-e",
                "print $]",
                onerror=lambda: die("Failed to get perl version."),
            )
        )

    @depends(get_perl_version)
    def check_perl_version(version):
        if version < min_version:
            die("Perl %s or higher is required.", min_version)

    @depends(perl)
    @checking("for full perl installation")
    @imports("subprocess")
    def has_full_perl_installation(perl):
        ret = subprocess.call([perl, "-e", "use Config; exit(!-d $Config{archlib})"])
        return ret == 0

    @depends(has_full_perl_installation)
    def require_full_perl_installation(has_full_perl_installation):
        if not has_full_perl_installation:
            die(
                "Cannot find Config.pm or $Config{archlib}. "
                "A full perl installation is required."
            )


perl_version_check("5.006")


# GNU make detection
# ==============================================================
option(env="MAKE", nargs=1, help="Path to GNU make")


@depends("MAKE", host)
def possible_makes(make, host):
    candidates = []
    if host.kernel == "WINNT":
        candidates.append("mingw32-make")
    if make:
        candidates.append(make[0])
    if host.kernel == "WINNT":
        candidates.extend(("mozmake", "make", "gmake"))
    else:
        candidates.extend(("gmake", "make"))
    return candidates


check_prog("GMAKE", possible_makes, bootstrap="mozmake")

# watchman detection
# ==============================================================

option(env="WATCHMAN", nargs=1, help="Path to the watchman program")


@depends(host, "WATCHMAN")
@checking("for watchman", callback=lambda w: w.path if w else "not found")
def watchman(host, prog):
    # On Windows, `watchman` is only supported on 64-bit hosts.
    if host.os == "WINNT" and host.cpu != "x86_64":
        return

    if not prog:
        prog = find_program("watchman")

    if not prog:
        return

    # `watchman version` will talk to the Watchman daemon service.
    # This can hang due to permissions problems. e.g.
    # https://github.com/facebook/watchman/issues/376. So use
    # `watchman --version` to prevent a class of failures.
    out = check_cmd_output(prog, "--version", onerror=lambda: None)
    if out is None:
        return

    return namespace(path=prog, version=Version(out.strip()))


@depends_if(watchman)
@checking("for watchman version")
def watchman_version(w):
    return w.version


set_config("WATCHMAN", watchman.path)


@depends_all(hg_version, hg_config, watchman)
@checking("for watchman Mercurial integration")
@imports("os")
def watchman_hg(hg_version, hg_config, watchman):
    if hg_version < Version("3.8"):
        return "no (Mercurial 3.8+ required)"

    ext_enabled = False
    mode_disabled = False

    for k in ("extensions.fsmonitor", "extensions.hgext.fsmonitor"):
        if k in hg_config and hg_config[k] != "!":
            ext_enabled = True

    mode_disabled = hg_config.get("fsmonitor.mode") == "off"

    if not ext_enabled:
        return "no (fsmonitor extension not enabled)"
    if mode_disabled:
        return "no (fsmonitor.mode=off disables fsmonitor)"

    return True


# Miscellaneous programs
# ==============================================================
check_prog("XARGS", ("xargs",))


@depends(target)
def extra_programs(target):
    if target.kernel == "Darwin":
        return namespace(
            DSYMUTIL=("dsymutil", "llvm-dsymutil"),
            MKFSHFS=("newfs_hfs", "mkfs.hfsplus"),
            HFS_TOOL=("hfsplus",),
        )
    if target.os == "GNU" and target.kernel == "Linux":
        return namespace(RPMBUILD=("rpmbuild",))


check_prog("DSYMUTIL", extra_programs.DSYMUTIL, allow_missing=True)
check_prog("MKFSHFS", extra_programs.MKFSHFS, allow_missing=True)
check_prog("HFS_TOOL", extra_programs.HFS_TOOL, allow_missing=True)
check_prog("RPMBUILD", extra_programs.RPMBUILD, allow_missing=True)


@depends(target)
@imports("os")
def makensis_progs(target):
    if target.kernel != "WINNT":
        return

    candidates = [
        "makensis-3.01",
        "makensis-3.0b3",
        "makensis-3.0b1",
        "makensis",
    ]

    # Look for nsis installed by msys environment. But only the 32-bit version.
    # We use an absolute path and insert as the first entry so it is preferred
    # over a 64-bit exe that may be in PATH.
    if "MSYSTEM_PREFIX" in os.environ:
        prefix = os.path.dirname(os.environ["MSYSTEM_PREFIX"])
        candidates.insert(0, os.path.join(prefix, "mingw32", "bin", "makensis.exe"))

    return tuple(candidates)


nsis = check_prog("MAKENSISU", makensis_progs, allow_missing=True)

# Make sure the version of makensis is up to date.


@depends(nsis, wine)
@checking("for NSIS version")
@imports("re")
def nsis_version(nsis, wine):
    if not nsis:
        return None
    nsis_min_version = "3.0b1"

    def onerror():
        return die("Failed to get nsis version.")

    if wine and nsis.lower().endswith(".exe"):
        out = check_cmd_output(wine, nsis, "-version", onerror=onerror)
    else:
        out = check_cmd_output(nsis, "-version", onerror=onerror)

    m = re.search(r"(?<=v)[0-9]+\.[0-9]+((a|b|rc)[0-9]+)?", out)

    if not m:
        raise FatalCheckError("Unknown version of makensis")
    ver = Version(m.group(0))

    # Versions comparisons don't quite work well with beta versions, so ensure
    # it works for the non-beta version.
    if ver < nsis_min_version and (ver >= "3.0a" or ver < "3"):
        raise FatalCheckError(
            "To build the installer you must have NSIS"
            " version %s or greater in your path" % nsis_min_version
        )

    return ver


# And that makensis is 32-bit (but only on Windows).
@depends_if(nsis, when=depends(host)(lambda h: h.kernel == "WINNT"))
@checking("for 32-bit NSIS")
def nsis_binary_type(nsis):
    bin_type = windows_binary_type(nsis)
    if bin_type != "win32":
        raise FatalCheckError("%s is not a 32-bit Windows application" % nsis)

    return "yes"


# And any flags we have to give to makensis
@depends(host)
def nsis_flags(host):
    if host.kernel != "WINNT":
        return "-nocd"
    return ""


set_config("MAKENSISU_FLAGS", nsis_flags)

check_prog("7Z", ("7z", "7za"), allow_missing=True, when=target_is_windows)
check_prog("UPX", ("upx",), allow_missing=True, when=target_is_windows)


@depends(host_c_compiler, c_compiler, bindgen_config_paths)
def llvm_objdump(host_c_compiler, c_compiler, bindgen_config_paths):
    clang = None
    for compiler in (host_c_compiler, c_compiler):
        if compiler and compiler.type == "clang":
            clang = compiler.compiler
            break
        elif compiler and compiler.type == "clang-cl":
            clang = os.path.join(os.path.dirname(compiler.compiler), "clang")
            break

    if not clang and bindgen_config_paths:
        clang = bindgen_config_paths.clang_path
    llvm_objdump = "llvm-objdump"
    if clang:
        out = check_cmd_output(
            clang, "--print-prog-name=llvm-objdump", onerror=lambda: None
        )
        if out:
            llvm_objdump = out.rstrip()
    return (llvm_objdump,)


llvm_objdump = check_prog(
    "LLVM_OBJDUMP",
    llvm_objdump,
    what="llvm-objdump",
    when="--enable-compile-environment",
    paths=clang_search_path,
)

add_old_configure_assignment("LLVM_OBJDUMP", llvm_objdump)


option("--enable-dtrace", help="Build with dtrace support")

dtrace = check_header(
    "sys/sdt.h",
    when="--enable-dtrace",
    onerror=lambda: die("dtrace enabled but sys/sdt.h not found"),