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.

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)))

set_config(
    "MOZ_DIAGNOSTIC_ASSERT_ENABLED",
    True,
    when=moz_debug | milestone.is_early_beta_or_earlier,
)
set_define(
    "MOZ_DIAGNOSTIC_ASSERT_ENABLED",
    True,
    when=moz_debug | milestone.is_early_beta_or_earlier,
)

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 --enable-release when MOZILLA_OFFICIAL is set rather than adjusting the
# default so that we can't have both MOZILLA_OFFICIAL and --disable-release set.
imply_option("--enable-release", mozilla_official)

option(
    "--enable-release",
    default=milestone.is_release_or_beta | depends("MOZ_AUTOMATION")(lambda x: bool(x)),
    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)


# hybrid build handling
# ==============================================================

option(
    "--disable-unified-build",
    help="Enable building modules in non unified context",
)

set_config("ENABLE_UNIFIED_BUILD", True, when="--disable-unified-build")


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


# 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. Uses 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)


check_prog("WGET", ("wget",), allow_missing=True)


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

include("build/moz.configure/pkg.configure")
include("build/moz.configure/memory.configure", when="--enable-compile-environment")
include("build/moz.configure/headers.configure", when="--enable-compile-environment")
include("build/moz.configure/libraries.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}
    windows_abi = {
        host: host_windows_abi,
        target: target_windows_abi,
    }[host_or_target]

    @depends(host_or_target, host_or_target.abi | windows_abi, so_version)
    def library_name_info_impl(host_or_target, windows_abi, 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 windows_abi and windows_abi != "msvc":
                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("HOST_LIB_PREFIX", host_library_name_info.lib.prefix)
set_config("HOST_IMPORT_LIB_SUFFIX", host_library_name_info.import_lib.suffix)
set_config("WASM_OBJ_SUFFIX", "wasm")


@template
def llvm_tool(name):
    @depends(host_c_compiler, c_compiler, bindgen_config_paths)
    def llvm_tool(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
        tool = name
        if clang:
            out = check_cmd_output(
                clang, "--print-prog-name=%s" % tool, onerror=lambda: None
            )
            if out:
                tool = out.rstrip()
        return (tool,)

    return llvm_tool


@template
def plain_llvm_or_prefixed(name, llvm_name=None):
    # look for a tool, using the following alternatives, in that order:
    # 1. llvm-${llvm_name}, or llvm-${name} if ${llvm_name} is not provided
    # 2. ${toolchain_prefix}${name}
    # 3. ${name}

    @depends(llvm_tool("llvm-{}".format(llvm_name or name)), toolchain_prefix)
    def plain_llvm_or_prefixed(llvm_tool, toolchain_prefix):
        commands = [llvm_tool[0], name]
        for prefix in toolchain_prefix or ():
            commands.insert(1, f"{prefix}{name}")
        return tuple(commands)

    return plain_llvm_or_prefixed


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

add_old_configure_assignment("LLVM_OBJDUMP", llvm_objdump)


def validate_readelf(path):
    # llvm-readelf from llvm < 8 doesn't support the GNU binutils-compatible `-d`
    # flag. We could try running `$path -d $some_binary` but we might be cross
    # compiling and not have a binary at hand to run that against. `$path -d` alone
    # would fail whether the flag is supported or not. So we resort to look for the
    # option in the `--help` output, which fortunately, s compatible between
    # llvm-readelf and readelf.
    retcode, stdout, stderr = get_cmd_output(path, "--help")
    return retcode == 0 and any(l.startswith("  -d ") for l in stdout.splitlines())


@depends("--enable-compile-environment", target, host)
def readelf_when(compile_env, target, host):
    return compile_env and any(
        x.kernel not in ("Darwin", "WINNT") for x in (target, host)
    )


readelf = check_prog(
    "READELF",
    plain_llvm_or_prefixed("readelf"),
    when=readelf_when,
    paths=clang_search_path,
    validate=validate_readelf,
)


def validate_objcopy(path):
    if "llvm-objcopy" not in path:
        return True
    # llvm-objcopy doesn't support --only-keep-debug before llvm 9.0.
    retcode, stdout, stderr = get_cmd_output(path, "--help")
    return retcode == 0 and any(
        l.startswith("  --only-keep-debug ") for l in stdout.splitlines()
    )


check_prog(
    "OBJCOPY",
    plain_llvm_or_prefixed("objcopy"),
    when=readelf_when,
    paths=clang_search_path,
    validate=validate_objcopy,
)


# 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)
js_shared = dependable(False)
moz_linker = dependable(False)
# Same for fold_libs
fold_libs = dependable(False)
# And dmd
dmd = 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(
    host,
    target,
    "--enable-artifact-builds",
    "--disable-compile-environment",
    "--enable-project",
    "--enable-application",
    "--help",
)
@imports("sys")
def build_backend_defaults(
    host,
    target,
    artifact_builds,
    compile_environment,
    project,
    application,
    _,
):
    if application:
        project = application[0]
    elif project:
        project = project[0]

    if artifact_builds:
        all_backends = ["FasterMake+RecursiveMake"]
    else:
        all_backends = ["RecursiveMake", "FasterMake"]
    if (
        host.os == "WINNT"
        and target.os == "WINNT"
        and compile_environment
        and project not in ("mobile/android", "memory", "tools/update-programs")
    ):
        all_backends.append("VisualStudio")
    if compile_environment and project not in ("memory", "tools/update-programs"):
        all_backends.append("Clangd")
    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)


# 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(
    build_project,
    target,
    "MOZ_AUTOMATION",
    enable_tests,
    when="--enable-compile-environment",
)
def build_gtest(build_project, target, automation, enable_tests):
    return bool(
        enable_tests
        and automation
        and build_project in ("browser", "comm/mail", "mobile/android")
        and not (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))

option(
    "--disable-icu4x",
    help="Disable using ICU4X",
)

set_config("MOZ_ICU4X", True, when="--enable-icu4x")
set_define("MOZ_ICU4X", True, when="--enable-icu4x")

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


@depends(host_library_name_info, 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"), paths=prefer_mozillabuild_path)

# 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)


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


@depends("MAKE", host)
def possible_makes(make, host):
    candidates = []
    if make:
        candidates.append(make[0])
    if host.kernel == "WINNT":
        candidates.extend(("mozmake", "mingw32-make", "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(
            MKFSHFS=("newfs_hfs", "mkfs.hfsplus"),
            HFS_TOOL=("hfsplus",),
        )
    if target.os == "GNU" and target.kernel == "Linux":
        return namespace(RPMBUILD=("rpmbuild",))


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)


nsis = check_prog(
    "MAKENSISU",
    ("makensis",),
    bootstrap="nsis/bin",
    allow_missing=True,
    when=target_is_windows,
)

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


@depends_if(nsis)
@checking("for NSIS version")
@imports("re")
def nsis_version(nsis):
    nsis_min_version = "3.0b1"

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

    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)


check_prog(
    "DSYMUTIL",
    llvm_tool("dsymutil"),
    when=compile_environment & target_is_darwin,
    paths=clang_search_path,
)


check_prog(
    "OTOOL",
    plain_llvm_or_prefixed("otool"),
    when=compile_environment & target_is_darwin,
    paths=clang_search_path,
)

check_prog(
    "INSTALL_NAME_TOOL",
    plain_llvm_or_prefixed("install_name_tool", llvm_name="install-name-tool"),
    when=compile_environment & target_is_darwin & js_standalone,
    paths=clang_search_path,
)

option("--disable-icf", help="Disable Identical Code Folding")

add_old_configure_assignment(
    "MOZ_DISABLE_ICF", "1", when=depends("--enable-icf")(lambda x: not x)
)


option(
    "--enable-strip",
    when=compile_environment,
    help="Enable stripping of libs & executables",
)

# This should be handled as a `when` once bug 1617793 is fixed.


@depends("--enable-strip", c_compiler, when=compile_environment)
def enable_strip(strip, c_compiler):
    if strip and c_compiler.type != "clang-cl":
        return True


set_config("ENABLE_STRIP", enable_strip)

option(
    "--disable-install-strip",
    when=compile_environment,
    help="Enable stripping of libs & executables when packaging",
)

# This should be handled as a `when` once bug 1617793 is fixed.


@depends("--enable-install-strip", c_compiler, when=compile_environment)
def enable_install_strip(strip, c_compiler):
    if strip and c_compiler.type != "clang-cl":
        return True


set_config("PKG_STRIP", enable_install_strip)


@depends("--enable-strip", "--enable-install-strip", when=compile_environment)
def strip(strip, install_strip):
    return strip or install_strip


option(env="STRIP_FLAGS", nargs=1, when=strip, help="Flags for the strip command")


@depends("STRIP_FLAGS", profiling, target, when=strip)
def strip_flags(flags, profiling, target):
    if flags:
        return flags[0].split()
    if profiling:
        # Only strip debug info and symbols when profiling is enabled, keeping
        # local symbols.
        if target.kernel == "Darwin":
            return ["-S"]
        elif target.os == "Android":
            # The tooling we use with Android supports detached symbols, and the
            # size increase caused by local symbols are too much for mobile. So,
            # don't restrict the amount of stripping with a flag.
            return
        else:
            return ["--strip-debug"]
    # Otherwise strip everything we can, which happens without flags on non-Darwin.
    # On Darwin, it tries to strip things it can't, so we need to limit its scope.
    elif target.kernel == "Darwin":
        return ["-x", "-S"]


set_config("STRIP_FLAGS", strip_flags)


def validate_strip(path):
    if "llvm-strip" not in path:
        return True
    # llvm-strip doesn't support -S before llvm 8.0.
    retcode, stdout, stderr = get_cmd_output(path, "--help")
    return retcode == 0 and any(l.startswith("  -S ") for l in stdout.splitlines())


@depends("--enable-compile-environment", target, host)
def strip_when(compile_env, target, host):
    return compile_env and any(x.kernel != "WINNT" for x in (target, host))


check_prog(
    "STRIP",
    plain_llvm_or_prefixed("strip"),
    when=strip_when,
    paths=clang_search_path,
    validate=validate_strip,
)


@depends(js_standalone, target)
def system_zlib_default(js_standalone, target):
    return (
        js_standalone
        and target.kernel not in ("WINNT", "Darwin")
        and target.os != "Android"
    )


option(
    "--with-system-zlib",
    nargs="?",
    default=system_zlib_default,
    help="{Use|Do not use} system libz",
)


@depends("--with-system-zlib")
def deprecated_system_zlib_path(value):
    if len(value) == 1:
        die(
            "--with-system-zlib=PATH is not supported anymore. Please use "
            "--with-system-zlib and set any necessary pkg-config environment variable."
        )


pkg_check_modules("MOZ_ZLIB", "zlib >= 1.2.3", when="--with-system-zlib")

set_config("MOZ_SYSTEM_ZLIB", True, when="--with-system-zlib")


@depends("--with-system-zlib", js_shared, moz_linker, target.os)
def zlib_in_mozglue(system_zlib, js_shared, linker, os):
    if not system_zlib and (js_shared or linker or os == "Android"):
        return True


set_config("ZLIB_IN_MOZGLUE", zlib_in_mozglue)
set_define("ZLIB_IN_MOZGLUE", zlib_in_mozglue)


# Please do not add configure checks from here on.

# Fallthrough to autoconf-based configure
include("build/moz.configure/old.configure")

# JS Subconfigure.
include("js/sub.configure", when=compile_environment & toolkit)


@depends(build_environment, configure_cache)
@imports(_import="json")
@imports(_from="pathlib", _import="Path")
def save_cache(build_environment, configure_cache):
    cache_file = Path(build_environment.topobjdir) / "configure.cache"

    with cache_file.open(mode="w") as fd:
        json.dump(configure_cache, fd, indent=4)


@depends(build_environment, build_project)
@imports("__sandbox__")
@imports("glob")
@imports(_from="os.path", _import="exists")
def config_status_deps(build_env, build_project):
    topsrcdir = build_env.topsrcdir
    topobjdir = build_env.topobjdir

    if not topobjdir.endswith("js/src"):
        extra_deps = [os.path.join(topobjdir, ".mozconfig.json")]
    else:
        # mozconfig changes may impact js configure.
        extra_deps = [os.path.join(topobjdir[:-7], ".mozconfig.json")]

    confvars = os.path.join(topsrcdir, build_project, "confvars.sh")
    if exists(confvars):
        extra_deps.append(confvars)

    return (
        list(__sandbox__._all_paths)
        + extra_deps
        + [
            os.path.join(topsrcdir, "CLOBBER"),
            os.path.join(topsrcdir, "configure"),
            os.path.join(topsrcdir, "js", "src", "configure"),
            os.path.join(topsrcdir, "nsprpub", "configure"),
            os.path.join(topsrcdir, "config", "milestone.txt"),
            os.path.join(topsrcdir, "browser", "config", "version.txt"),
            os.path.join(topsrcdir, "browser", "config", "version_display.txt"),
            os.path.join(topsrcdir, "python", "sites", "build.txt"),
            os.path.join(topsrcdir, "python", "sites", "common.txt"),
            os.path.join(topsrcdir, "python", "sites", "mach.txt"),
            os.path.join(topsrcdir, "python", "mach", "mach", "site.py"),
            os.path.join(topsrcdir, "aclocal.m4"),
            os.path.join(topsrcdir, "old-configure.in"),
            os.path.join(topsrcdir, "js", "src", "aclocal.m4"),
            os.path.join(topsrcdir, "js", "src", "old-configure.in"),
        ]
        + glob.glob(os.path.join(topsrcdir, "build", "autoconf", "*.m4"))
    )


set_config("CONFIG_STATUS_DEPS", config_status_deps)
# Please do not add anything after setting config_dep_paths.