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build: let rustc pick filenames, remove rust depfile hack

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Fixes #787.
This commit is contained in:
Bert Belder 2018-09-25 18:44:23 -07:00
parent 531a427d88
commit f10012facf
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GPG key ID: 7A77887B2E2ED461
2 changed files with 55 additions and 115 deletions
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121
build_extra/rust/rust.gni
View file

@ -70,88 +70,72 @@ template("run_rustc") {
treat_warnings_as_errors = rust_treat_warnings_as_errors
}
sources = [
source_root,
]
script = "//tools/run_rustc.py"
args = [
rebase_path(source_root, root_build_dir),
"--crate-name=$crate_name",
"--crate-type=$crate_type",
]
if (treat_warnings_as_errors) {
args += [ "-Dwarnings" ]
}
args += [ "--color=always" ]
if (!defined(crate_version)) {
crate_name_and_version = crate_name
# If there is only a single version of this crate in our tree, there's no
# need to set the crate metadata and add a suffix to the file name.
metadata = ""
crate_suffix = ""
} else {
crate_name_and_version = "$crate_name-$crate_version"
# Rustc blows up if a target (directly or indirectly) depends on two+
# crates that have the same name *and* the same metadata, so we use the
# version number to ensure they have unique metadata.
metadata = crate_version
# In our build setup, all crates are built in the same directory. To avoid
# file name conflicts between when multiple versions of the same crate are
# built, add a unique suffix to output file names.
#
# Unfortunately the version number as such can't be used directly:
# everything after the first dot (.) is thrown away by rust, so in case of
# foo-0.2 vs foo-0.3 only the first '0' would be used, and conflicts would
# still occur. Therefore we use a hash of the version number instead.
crate_suffix = exec_script("//tools/sha256sum.py",
[
"--input=$crate_version",
"--format=-%.8s",
],
"trim string")
}
if (crate_type == "bin") {
output_file = "$out_dir/$crate_name_and_version.o"
output_file = "$out_dir/$crate_name$crate_suffix.o"
emit_type = "obj"
} else if (crate_type == "rlib") {
output_file = "$out_dir/lib$crate_name_and_version.rlib"
output_file = "$out_dir/lib$crate_name$crate_suffix.rlib"
emit_type = "link"
}
script = "//third_party/v8/tools/run.py"
sources = [
source_root,
]
outputs = [
output_file,
]
output_file_rel = rebase_path(output_file, root_build_dir)
args += [ "--emit=$emit_type=$output_file_rel" ]
depfile = "$out_dir/$crate_name$crate_suffix.d"
depfile = "$out_dir/$crate_name_and_version.d"
args += [
"--emit=dep-info=" + rebase_path(depfile, root_build_dir),
args = [
"rustc",
rebase_path(source_root, root_build_dir),
"--crate-name=$crate_name",
"--crate-type=$crate_type",
"--emit=$emit_type,dep-info",
"--out-dir=" + rebase_path(out_dir, root_build_dir),
# The following two args are used by run_rustc.py to fix
# the depfile on the fly. They are not passed thru to rustc.
"--depfile=" + rebase_path(depfile, root_build_dir),
"--output_file=" + output_file_rel,
# This is to disambiguate multiple versions of the same crate.
"-Cextra-filename=$crate_suffix",
"-Cmetadata=$metadata",
# This is needed for transitive dependencies.
"-L",
"dependency=" + rebase_path(out_dir, root_build_dir),
# Use colorful output even if stdout is redirected and not a tty.
"--color=always",
]
if (defined(crate_version)) {
# Compute the sha256sum of the version number. See comments below.
# Note that we do this only if there are multiple versions of this crate.
hash = exec_script("//tools/sha256sum.py",
[
"--input",
crate_version,
"--format",
"%.8s",
],
"trim string")
args += [
# In our build setup, all crates are built in the same directory. The
# actual build outputs have unique names (e.g. 'foo-1.2.3.rlib'), but
# rustc also creates many temp files (e.g. 'foo.crate.metadata.rcgu.bc',
# 'foo.foo0.rcgu.o'), and with those files, name collisions do occur.
# This causes random failures during parallel builds and on CI.
#
# These name conflicts can be avoided by setting `-C extra-filename=` to
# some unique value. Unfortunately the version number as such can't be
# used: everything after the first dot (.) is thrown away, so winapi-0.2
# vs. winapi-0.3 would still have conflicts -- so we use a hash instead.
"-C",
"extra-filename=$hash",
# Rustc blows up if a target (directly or indirectly) depends on two+
# crates that have the same name *and* the same metadata. So we use the
# hash to give 'metadata' a unique value too (any unique value will do).
"-C",
"metadata=$hash",
]
if (treat_warnings_as_errors) {
args += [ "-Dwarnings" ]
}
if (is_debug) {
@ -187,7 +171,7 @@ template("run_rustc") {
# Build the list of '--extern' arguments from the 'extern_infos' array.
foreach(info, extern_infos) {
rlib = "$out_dir/lib${info.crate_name_and_version}.rlib"
rlib = "$out_dir/lib${info.crate_name}${info.crate_suffix}.rlib"
args += [
"--extern",
info.crate_name + "=" + rebase_path(rlib, root_build_dir),
@ -214,7 +198,7 @@ template("rust_crate") {
{
label = label
crate_name = get_label_info(label, "name")
crate_name_and_version = crate_name
crate_suffix = ""
},
]
}
@ -229,7 +213,12 @@ template("rust_crate") {
"crate_name",
"crate_version",
])
crate_name_and_version = "$crate_name-$crate_version"
crate_suffix = exec_script("//tools/sha256sum.py",
[
"--input=$crate_version",
"--format=-%.8s",
],
"trim string")
},
]
}
@ -271,7 +260,7 @@ template("rust_crate") {
libs = []
}
foreach(info, extern_infos) {
rlib = "$out_dir/lib${info.crate_name_and_version}.rlib"
rlib = "$out_dir/lib${info.crate_name}${info.crate_suffix}.rlib"
libs += [ rlib ]
}
lib_dirs = [ out_dir ]

49
tools/run_rustc.py
View file

@ -1,49 +0,0 @@
#!/usr/bin/env python
# Inspired by
# https://fuchsia.googlesource.com/build/+/master/rust/build_rustc_target.py
# Copyright 2018 The Fuchsia Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
import sys
import os
import argparse
import subprocess
import util
# Updates the path of the main target in the depfile to the relative path
# from base_path build_output_path
def fix_depfile(depfile_path, base_path, build_output_path):
# It's important that the fixed-up depfile has the same mtime as before.
# Ninja relies on it to decide whether to rebuild the target it belongs to.
stat = os.stat(depfile_path)
with open(depfile_path, "r") as depfile:
content = depfile.read()
content_split = content.split(': ', 1)
target_path = os.path.relpath(build_output_path, start=base_path)
new_content = "%s: %s" % (target_path, content_split[1])
with open(depfile_path, "w") as depfile:
depfile.write(new_content)
os.utime(depfile_path, (stat.st_atime, stat.st_mtime))
def main():
parser = argparse.ArgumentParser("Compiles a Rust crate")
parser.add_argument(
"--depfile",
help="Path at which the output depfile should be stored",
required=False)
parser.add_argument(
"--output_file",
help="Path at which the output file should be stored",
required=False)
args, rest = parser.parse_known_args()
util.run(["rustc"] + rest, quiet=True)
if args.depfile and args.output_file:
fix_depfile(args.depfile, os.getcwd(), args.output_file)
if __name__ == '__main__':
sys.exit(main())