gecko-dev/build/moz.configure/rust.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/.

# Rust is required by `rust_compiler` below. We allow_missing here
# to propagate failures to the better error message there.
rustc = check_prog('RUSTC', ['rustc'], allow_missing=True)
cargo = check_prog('CARGO', ['cargo'], allow_missing=True)

@depends_if(rustc)
@checking('rustc version', lambda info: info.version)
def rustc_info(rustc):
    out = check_cmd_output(rustc, '--version', '--verbose').splitlines()
    info = dict((s.strip() for s in line.split(':', 1)) for line in out[1:])
    return namespace(
        version=Version(info.get('release', '0')),
        commit=info.get('commit-hash', 'unknown'),
    )

@depends_if(cargo)
@checking('cargo version', lambda info: info.version)
@imports('re')
def cargo_info(cargo):
    out = check_cmd_output(cargo, '--version', '--verbose').splitlines()
    info = dict((s.strip() for s in line.split(':', 1)) for line in out[1:])
    version = info.get('release')
    # Older versions of cargo didn't support --verbose, in which case, they
    # only output a not-really-pleasant-to-parse output. Fortunately, they
    # don't error out, so we can just try some regexp matching on the output
    # we already got.
    if version is None:
        VERSION_FORMAT = r'^cargo (\d\.\d+\.\d+).*'

        m = re.search(VERSION_FORMAT, out[0])
        # Fail fast if cargo changes its output on us.
        if not m:
            die('Could not determine cargo version from output: %s', out)
        version = m.group(1)

    return namespace(
        version=Version(version),
    )

@depends(rustc_info, cargo_info)
@imports(_from='textwrap', _import='dedent')
def rust_compiler(rustc_info, cargo_info):
    if not rustc_info:
        die(dedent('''\
        Rust compiler not found.
        To compile rust language sources, you must have 'rustc' in your path.
        See https://www.rust-lang.org/ for more information.

        You can install rust by running './mach bootstrap'
        or by directly running the installer from https://rustup.rs/
        '''))
    rustc_min_version = Version('1.15.1')
    cargo_min_version = Version('0.{}'.format(rustc_min_version.minor + 1))

    version = rustc_info.version
    if version < rustc_min_version:
        die(dedent('''\
        Rust compiler {} is too old.

        To compile Rust language sources please install at least
        version {} of the 'rustc' toolchain and make sure it is
        first in your path.

        You can verify this by typing 'rustc --version'.

        If you have the 'rustup' tool installed you can upgrade
        to the latest release by typing 'rustup update'. The
        installer is available from https://rustup.rs/
        '''.format(version, rustc_min_version)))

    if not cargo_info:
        die(dedent('''\
        Cargo package manager not found.
        To compile Rust language sources, you must have 'cargo' in your path.
        See https://www.rust-lang.org/ for more information.

        You can install cargo by running './mach bootstrap'
        or by directly running the installer from https://rustup.rs/
        '''))

    version = cargo_info.version
    if version < cargo_min_version:
        die(dedent('''\
        Cargo package manager {} is too old.

        To compile Rust language sources please install at least
        version {} of 'cargo' and make sure it is first in your path.

        You can verify this by typing 'cargo --version'.
        ''').format(version, cargo_min_version))

    return True

set_config('MOZ_RUST', rust_compiler)

@template
def rust_triple_alias(host_or_target):
    """Template defining the alias used for rustc's --target flag.
    `host_or_target` is either `host` or `target` (the @depends functions
    from init.configure).
    """
    assert host_or_target in (host, target)

    @depends(rustc, host_or_target, when=rust_compiler)
    @imports('os')
    @imports('subprocess')
    @imports(_from='mozbuild.configure.util', _import='LineIO')
    @imports(_from='mozbuild.shellutil', _import='quote')
    @imports(_from='tempfile', _import='mkstemp')
    @imports(_from='textwrap', _import='dedent')
    def rust_target(rustc, host_or_target):
        # Rust's --target options are similar to, but not exactly the same
        # as, the autoconf-derived targets we use.  An example would be that
        # Rust uses distinct target triples for targetting the GNU C++ ABI
        # and the MSVC C++ ABI on Win32, whereas autoconf has a single
        # triple and relies on the user to ensure that everything is
        # compiled for the appropriate ABI.  We need to perform appropriate
        # munging to get the correct option to rustc.
        #
        # The canonical list of targets supported can be derived from:
        #
        # https://github.com/rust-lang/rust/blob/master/src/librustc_back/target/mod.rs

        # Avoid having to write out os+kernel for all the platforms where
        # they don't differ.
        os_or_kernel = host_or_target.kernel if host_or_target.kernel == 'Linux' and host_or_target.os != 'Android' else host_or_target.os
        rustc_target = {
            # DragonFly
            ('x86_64', 'DragonFly'): 'x86_64-unknown-dragonfly',
            # FreeBSD
            ('aarch64', 'FreeBSD'): 'aarch64-unknown-freebsd',
            ('x86', 'FreeBSD'): 'i686-unknown-freebsd',
            ('x86_64', 'FreeBSD'): 'x86_64-unknown-freebsd',
            # NetBSD
            ('sparc64', 'NetBSD'): 'sparc64-unknown-netbsd',
            ('x86', 'NetBSD'): 'i686-unknown-netbsd',
            ('x86_64', 'NetBSD'): 'x86_64-unknown-netbsd',
            # OpenBSD
            ('x86', 'OpenBSD'): 'i686-unknown-openbsd',
            ('x86_64', 'OpenBSD'): 'x86_64-unknown-openbsd',
            # Linux
            ('aarch64', 'Linux'): 'aarch64-unknown-linux-gnu',
            ('arm', 'Linux'): 'armv7-unknown-linux-gnueabihf',
            ('sparc64', 'Linux'): 'sparc64-unknown-linux-gnu',
            ('x86', 'Linux'): 'i686-unknown-linux-gnu',
            ('x86_64', 'Linux'): 'x86_64-unknown-linux-gnu',
            # OS X
            ('x86', 'OSX'): 'i686-apple-darwin',
            ('x86_64', 'OSX'): 'x86_64-apple-darwin',
            # iOS
            ('aarch64', 'iOS'): 'aarch64-apple-ios',
            ('arm', 'iOS'): 'armv7s-apple-ios',
            ('x86', 'iOS'): 'i386-apple-ios',
            ('x86_64', 'iOS'): 'x86_64-apple-ios',
            # Android
            ('aarch64', 'Android'): 'aarch64-linux-android',
            ('arm', 'Android'): 'armv7-linux-androideabi',
            ('x86', 'Android'): 'i686-linux-android',
            # Windows
            # XXX better detection of CXX needed here, to figure out whether
            # we need i686-pc-windows-gnu instead, since mingw32 builds work.
            ('x86', 'WINNT'): 'i686-pc-windows-msvc',
            ('x86_64', 'WINNT'): 'x86_64-pc-windows-msvc',
        }.get((host_or_target.cpu, os_or_kernel), None)

        if rustc_target is None:
            die("Don't know how to translate {} for rustc".format(host_or_target.alias))

        # Check to see whether our rustc has a reasonably functional stdlib
        # for our chosen target.
        target_arg = '--target=' + rustc_target
        in_fd, in_path = mkstemp(prefix='conftest', suffix='.rs')
        out_fd, out_path = mkstemp(prefix='conftest', suffix='.rlib')
        os.close(out_fd)
        try:
            source = 'pub extern fn hello() { println!("Hello world"); }'
            log.debug('Creating `%s` with content:', in_path)
            with LineIO(lambda l: log.debug('| %s', l)) as out:
                out.write(source)

            os.write(in_fd, source)
            os.close(in_fd)

            cmd = [
                rustc,
                '--crate-type', 'staticlib',
                target_arg,
                '-o', out_path,
                in_path,
            ]
            def failed():
                die(dedent('''\
                Cannot compile for {} with {}
                The target may be unsupported, or you may not have
                a rust std library for that target installed. Try:

                  rustup target add {}
                '''.format(host_or_target.alias, rustc, rustc_target)))
            check_cmd_output(*cmd, onerror=failed)
            if not os.path.exists(out_path) or os.path.getsize(out_path) == 0:
                failed()
        finally:
            os.remove(in_path)
            os.remove(out_path)

        # This target is usable.
        return rustc_target

    return rust_target

rust_target_triple = rust_triple_alias(target)
rust_host_triple = rust_triple_alias(host)

set_config('RUST_TARGET', rust_target_triple)
set_config('RUST_HOST_TARGET', rust_host_triple)

# Until we remove all the other Rust checks in old-configure.
add_old_configure_assignment('MOZ_RUST', rust_compiler)
add_old_configure_assignment('RUSTC', rustc)
add_old_configure_assignment('RUST_TARGET', rust_target_triple)