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

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Python
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# -*- 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.
option(env="RUSTC", nargs=1, help="Path to the rust compiler")
option(env="CARGO", nargs=1, help="Path to the Cargo package manager")
rustc = check_prog(
"_RUSTC",
["rustc"],
what="rustc",
paths=rust_search_path,
input="RUSTC",
allow_missing=True,
)
cargo = check_prog(
"_CARGO",
["cargo"],
what="cargo",
paths=rust_search_path,
input="CARGO",
allow_missing=True,
)
@template
def unwrap_rustup(prog, name):
# rustc and cargo can either be rustup wrappers, or they can be the actual,
# plain executables. For cargo, on OSX, rustup sets DYLD_LIBRARY_PATH (at
# least until https://github.com/rust-lang/rustup.rs/pull/1752 is merged
# and shipped) and that can wreak havoc (see bug 1536486). Similarly, for
# rustc, rustup silently honors toolchain overrides set by vendored crates
# (see bug 1547196).
#
# In either case, we need to find the plain executables.
#
# To achieve that, try to run `PROG +stable`. When the rustup wrapper is in
# use, it either prints PROG's help and exits with status 0, or prints
# an error message (error: toolchain 'stable' is not installed) and exits
# with status 1. In the cargo case, when plain cargo is in use, it exits
# with a different error message (e.g. "error: no such subcommand:
# `+stable`"), and exits with status 101.
#
# Unfortunately, in the rustc case, when plain rustc is in use,
# `rustc +stable` will exit with status 1, complaining about a missing
# "+stable" file. We'll examine the error output to try and distinguish
# between failing rustup and failing rustc.
@depends(prog, dependable(name))
@imports(_from="__builtin__", _import="open")
@imports("os")
def unwrap(prog, name):
if not prog:
return
def from_rustup_which():
out = check_cmd_output("rustup", "which", name, executable=prog).rstrip()
# If for some reason the above failed to return something, keep the
# PROG we found originally.
if out:
log.info("Actually using '%s'", out)
return out
log.info("No `rustup which` output, using '%s'", prog)
return prog
(retcode, stdout, stderr) = get_cmd_output(prog, "+stable")
if name == "cargo" and retcode != 101:
prog = from_rustup_which()
elif name == "rustc":
if retcode == 0:
prog = from_rustup_which()
elif "+stable" in stderr:
# PROG looks like plain `rustc`.
pass
else:
# Assume PROG looks like `rustup`. This case is a little weird,
# insofar as the user doesn't have the "stable" toolchain
# installed, but go ahead and unwrap anyway: the user might
# have only certain versions, beta, or nightly installed, and
# we'll catch invalid versions later.
prog = from_rustup_which()
return prog
return unwrap
rustc = unwrap_rustup(rustc, "rustc")
cargo = unwrap_rustup(cargo, "cargo")
set_config("CARGO", cargo)
set_config("RUSTC", rustc)
@depends_if(rustc)
@checking("rustc version", lambda info: info.version)
def rustc_info(rustc):
if not rustc:
return
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"),
host=info["host"],
llvm_version=Version(info.get("LLVM version", "0")),
)
set_config(
"RUSTC_VERSION",
depends(rustc_info)(lambda info: str(info.version) if info else None),
)
set_config(
"RUSTC_LLVM_VERSION",
depends(rustc_info)(lambda info: str(info.llvm_version) if info else None),
)
@depends_if(cargo)
@checking("cargo version", lambda info: info.version)
@imports("re")
def cargo_info(cargo):
if not cargo:
return
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="mozboot.util", _import="MINIMUM_RUST_VERSION")
@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(MINIMUM_RUST_VERSION)
cargo_min_version = rustc_min_version
version = rustc_info.version
is_nightly = "nightly" in version.version
is_version_number_match = (
version.major == rustc_min_version.major
and version.minor == rustc_min_version.minor
and version.patch == rustc_min_version.patch
)
if version < rustc_min_version or (is_version_number_match and is_nightly):
die(
dedent(
"""\
Rust compiler {} is too old.
To compile Rust language sources please install at least
version {} of the 'rustc' toolchain (or, if using nightly,
at least one version newer than {}) 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, 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
@depends(rustc, when=rust_compiler)
@imports(_from="__builtin__", _import="ValueError")
def rust_supported_targets(rustc):
out = check_cmd_output(rustc, "--print", "target-list").splitlines()
data = {}
for t in out:
try:
info = split_triplet(t, allow_wasi=True)
except ValueError:
if t.startswith("thumb"):
cpu, rest = t.split("-", 1)
retry = "-".join(("arm", rest))
elif t.endswith("-windows-msvc"):
retry = t[: -len("windows-msvc")] + "mingw32"
elif t.endswith("-windows-gnu"):
retry = t[: -len("windows-gnu")] + "mingw32"
else:
continue
try:
info = split_triplet(retry, allow_wasi=True)
except ValueError:
continue
key = (info.cpu, info.endianness, info.os)
data.setdefault(key, []).append(namespace(rust_target=t, target=info))
return data
def detect_rustc_target(
host_or_target, compiler_info, arm_target, rust_supported_targets
):
# 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.
# We correlate the autoconf-derived targets with the list of targets
# rustc gives us with --print target-list.
candidates = rust_supported_targets.get(
(host_or_target.cpu, host_or_target.endianness, host_or_target.os), []
)
def find_candidate(candidates):
if len(candidates) == 1:
return candidates[0].rust_target
elif not candidates:
return None
# We have multiple candidates. There are two cases where we can try to
# narrow further down using extra information from the build system.
# - For windows targets, correlate with the C compiler type
if host_or_target.kernel == "WINNT":
if compiler_info.type in ("gcc", "clang"):
suffix = "windows-gnu"
else:
suffix = "windows-msvc"
narrowed = [
c for c in candidates if c.rust_target.endswith("-{}".format(suffix))
]
if len(narrowed) == 1:
return narrowed[0].rust_target
elif narrowed:
candidates = narrowed
vendor_aliases = {"pc": ("w64", "windows")}
narrowed = [
c
for c in candidates
if host_or_target.vendor in vendor_aliases.get(c.target.vendor, ())
]
if len(narrowed) == 1:
return narrowed[0].rust_target
# - For arm targets, correlate with arm_target
# we could be more thorough with the supported rust targets, but they
# don't support OSes that are supported to build Gecko anyways.
# Also, sadly, the only interface to check the rust target cpu features
# is --print target-spec-json, and it's unstable, so we have to rely on
# our own knowledge of what each arm target means.
if host_or_target.cpu == "arm" and host_or_target.endianness == "little":
prefixes = []
if arm_target.arm_arch >= 7:
if arm_target.thumb2 and arm_target.fpu == "neon":
prefixes.append("thumbv7neon")
if arm_target.thumb2:
prefixes.append("thumbv7a")
prefixes.append("armv7")
if arm_target.arm_arch >= 6:
prefixes.append("armv6")
if host_or_target.os != "Android":
# arm-* rust targets are armv6... except arm-linux-androideabi
prefixes.append("arm")
if arm_target.arm_arch >= 5:
prefixes.append("armv5te")
if host_or_target.os == "Android":
# arm-* rust targets are armv6... except arm-linux-androideabi
prefixes.append("arm")
if arm_target.arm_arch >= 4:
prefixes.append("armv4t")
# rust freebsd targets are the only ones that don't have a 'hf' suffix
# for hard-float. Technically, that means if the float abi ever is not
# hard-float, this will pick a wrong target, but since rust only
# supports hard-float, let's assume that means freebsd only support
# hard-float.
if arm_target.float_abi == "hard" and host_or_target.os != "FreeBSD":
suffix = "hf"
else:
suffix = ""
for p in prefixes:
for c in candidates:
if c.rust_target.startswith(
"{}-".format(p)
) and c.rust_target.endswith(suffix):
return c.rust_target
# See if we can narrow down on the exact alias
narrowed = [c for c in candidates if c.target.alias == host_or_target.alias]
if len(narrowed) == 1:
return narrowed[0].rust_target
elif narrowed:
candidates = narrowed
# See if we can narrow down with the raw OS
narrowed = [c for c in candidates if c.target.raw_os == host_or_target.raw_os]
if len(narrowed) == 1:
return narrowed[0].rust_target
elif narrowed:
candidates = narrowed
# See if we can narrow down with the raw OS and raw CPU
narrowed = [
c
for c in candidates
if c.target.raw_os == host_or_target.raw_os
and c.target.raw_cpu == host_or_target.raw_cpu
]
if len(narrowed) == 1:
return narrowed[0].rust_target
# Finally, see if the vendor can be used to disambiguate.
narrowed = [c for c in candidates if c.target.vendor == host_or_target.vendor]
if len(narrowed) == 1:
return narrowed[0].rust_target
return None
rustc_target = find_candidate(candidates)
if rustc_target is None:
die("Don't know how to translate {} for rustc".format(host_or_target.alias))
return rustc_target
@imports("os")
@imports(_from="six", _import="ensure_binary")
@imports(_from="tempfile", _import="mkstemp")
@imports(_from="textwrap", _import="dedent")
@imports(_from="mozbuild.configure.util", _import="LineIO")
def assert_rust_compile(host_or_target, rustc_target, rustc):
# 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", text=True)
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, ensure_binary(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)
@depends(
rustc,
host,
host_c_compiler,
rustc_info.host,
rust_supported_targets,
arm_target,
when=rust_compiler,
)
@checking("for rust host triplet")
@imports(_from="textwrap", _import="dedent")
def rust_host_triple(
rustc, host, compiler_info, rustc_host, rust_supported_targets, arm_target
):
rustc_target = detect_rustc_target(
host, compiler_info, arm_target, rust_supported_targets
)
if rustc_target != rustc_host:
if host.alias == rustc_target:
configure_host = host.alias
else:
configure_host = "{}/{}".format(host.alias, rustc_target)
die(
dedent(
"""\
The rust compiler host ({rustc}) is not suitable for the configure host ({configure}).
You can solve this by:
* Set your configure host to match the rust compiler host by editing your
mozconfig and adding "ac_add_options --host={rustc}".
* Or, install the rust toolchain for {configure}, if supported, by running
"rustup default stable-{rustc_target}"
""".format(
rustc=rustc_host,
configure=configure_host,
rustc_target=rustc_target,
)
)
)
assert_rust_compile(host, rustc_target, rustc)
return rustc_target
@depends(
rustc, target, c_compiler, rust_supported_targets, arm_target, when=rust_compiler
)
@checking("for rust target triplet")
def rust_target_triple(
rustc, target, compiler_info, rust_supported_targets, arm_target
):
rustc_target = detect_rustc_target(
target, compiler_info, arm_target, rust_supported_targets
)
assert_rust_compile(target, rustc_target, rustc)
return rustc_target
set_config("RUST_TARGET", rust_target_triple)
set_config("RUST_HOST_TARGET", rust_host_triple)
# This is used for putting source info into symbol files.
set_config("RUSTC_COMMIT", depends(rustc_info)(lambda i: i.commit))
# Rustdoc is required by Rust tests below.
option(env="RUSTDOC", nargs=1, help="Path to the rustdoc program")
rustdoc = check_prog(
"RUSTDOC",
["rustdoc"],
paths=rust_search_path,
input="RUSTDOC",
allow_missing=True,
)
# This option is separate from --enable-tests because Rust tests are particularly
# expensive in terms of compile time (especially for code in libxul).
option(
"--enable-rust-tests",
help="Enable building and running of Rust tests during `make check`",
)
@depends("--enable-rust-tests", rustdoc)
def rust_tests(enable_rust_tests, rustdoc):
if enable_rust_tests and not rustdoc:
die("--enable-rust-tests requires rustdoc")
return bool(enable_rust_tests)
set_config("MOZ_RUST_TESTS", rust_tests)
@depends(target, c_compiler, rustc)
@imports("os")
def rustc_natvis_ldflags(target, compiler_info, rustc):
if target.kernel == "WINNT" and compiler_info.type == "clang-cl":
sysroot = check_cmd_output(rustc, "--print", "sysroot").strip()
etc = os.path.join(sysroot, "lib/rustlib/etc")
ldflags = []
if os.path.isdir(etc):
for f in os.listdir(etc):
if f.endswith(".natvis"):
ldflags.append("-NATVIS:" + normsep(os.path.join(etc, f)))
return ldflags
set_config("RUSTC_NATVIS_LDFLAGS", rustc_natvis_ldflags)
option(
"--enable-rust-debug",
default=depends(when="--enable-debug")(lambda: True),
help="{Build|Do not build} Rust code with debug assertions turned " "on.",
)
@depends(when="--enable-rust-debug")
def debug_rust():
return True
set_config("MOZ_DEBUG_RUST", debug_rust)
set_define("MOZ_DEBUG_RUST", debug_rust)
# ==============================================================
option(env="RUSTFLAGS", nargs=1, help="Rust compiler flags")
set_config("RUSTFLAGS", depends("RUSTFLAGS")(lambda flags: flags))
# Rust compiler flags
# ==============================================================
@depends(moz_optimize)
def rustc_opt_level_default(moz_optimize):
return "2" if moz_optimize.optimize else "0"
option(
env="RUSTC_OPT_LEVEL",
default=rustc_opt_level_default,
nargs=1,
help="Rust compiler optimization level (-C opt-level=%s)",
)
@depends("RUSTC_OPT_LEVEL")
def rustc_opt_level(opt_level_option):
return opt_level_option[0]
set_config("CARGO_PROFILE_RELEASE_OPT_LEVEL", rustc_opt_level)
set_config("CARGO_PROFILE_DEV_OPT_LEVEL", rustc_opt_level)
@depends(
rustc_opt_level,
debug_rust,
target,
"--enable-debug-symbols",
"--enable-frame-pointers",
path_remapping,
path_remappings,
)
def rust_compile_flags(
opt_level,
debug_rust,
target,
debug_symbols,
frame_pointers,
path_remapping,
path_remappings,
):
# Cargo currently supports only two interesting profiles for building:
# development and release. Those map (roughly) to --enable-debug and
# --disable-debug in Gecko, respectively.
#
# But we'd also like to support an additional axis of control for
# optimization level. Since Cargo only supports 2 profiles, we're in
# a bit of a bind.
#
# Code here derives various compiler options given other configure options.
# The options defined here effectively override defaults specified in
# Cargo.toml files.
debug_assertions = None
debug_info = None
# opt-level=0 implies -C debug-assertions, which may not be desired
# unless Rust debugging is enabled.
if opt_level == "0" and not debug_rust:
debug_assertions = False
if debug_symbols:
debug_info = "2"
opts = []
if debug_assertions is not None:
opts.append("debug-assertions=%s" % ("yes" if debug_assertions else "no"))
if debug_info is not None:
opts.append("debuginfo=%s" % debug_info)
if frame_pointers:
opts.append("force-frame-pointers=yes")
# CFG for arm64 is crashy, see `def security_hardening_cflags`.
if target.kernel == "WINNT" and target.cpu != "aarch64":
opts.append("control-flow-guard=yes")
flags = []
for opt in opts:
flags.extend(["-C", opt])
if "rust" in path_remapping:
# rustc has supported --remap-path-prefix since version 1.26, well
# before our required minimum Rust version, so there's no need to
# feature-detect or gate on versions.
for old, new in path_remappings:
flags.append(f"--remap-path-prefix={old}={new}")
return flags
# Rust incremental compilation
# ==============================================================
option("--disable-cargo-incremental", help="Disable incremental rust compilation.")
@depends(
rustc_opt_level,
debug_rust,
"MOZ_AUTOMATION",
code_coverage,
"--disable-cargo-incremental",
using_sccache,
"RUSTC_WRAPPER",
)
@imports("os")
def cargo_incremental(
developer_options,
debug_rust,
automation,
code_coverage,
enabled,
using_sccache,
rustc_wrapper,
):
"""Return a value for the CARGO_INCREMENTAL environment variable."""
if not enabled:
return "0"
elif enabled.origin != "default":
return "1"
# We never want to use incremental compilation in automation. sccache
# handles our automation use case much better than incremental compilation
# would.
if automation:
return "0"
# Coverage instrumentation doesn't play well with incremental compilation
# https://github.com/rust-lang/rust/issues/50203.
if code_coverage:
return "0"
# Incremental compilation doesn't work as well as it should, and if we're
# using sccache, it's better to use sccache than incremental compilation.
if not using_sccache and rustc_wrapper:
rustc_wrapper = os.path.basename(rustc_wrapper[0])
if os.path.splitext(rustc_wrapper)[0].lower() == "sccache":
using_sccache = True
if using_sccache:
return "0"
# Incremental compilation is automatically turned on for debug builds, so
# we don't need to do anything special here.
if debug_rust:
return
# Don't enable on --enable-release builds, because of the runtime
# performance cost.
if not developer_options:
return
# We're clear to use incremental compilation!
return "1"
set_config("CARGO_INCREMENTAL", cargo_incremental)
@depends(rust_compile_flags, "--enable-warnings-as-errors", rustc_info)
def rust_flags(compile_flags, warnings_as_errors, rustc_info):
warning_flags = []
# Note that cargo passes --cap-lints warn to rustc for third-party code, so
# we don't need a very complicated setup.
if warnings_as_errors:
warning_flags.append("-Dwarnings")
# Work around https://github.com/rust-lang/rust/issues/84428
if rustc_info.version >= "1.52":
warning_flags.append("-Aproc-macro-back-compat")
else:
warning_flags.extend(("--cap-lints", "warn"))
return compile_flags + warning_flags
set_config("MOZ_RUST_DEFAULT_FLAGS", rust_flags)
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