#!/usr/bin/env python3 # Copyright 2023 The Chromium Authors # Use of this source code is governed by a BSD-style license that can be # found in the LICENSE file. '''Builds the bindgen tool.''' import argparse import collections import os import platform import shutil import subprocess import sys from build_rust import (CARGO_HOME_DIR, CIPD_DOWNLOAD_URL, FetchBetaPackage, InstallBetaPackage, RustTargetTriple, RUST_HOST_LLVM_INSTALL_DIR) from update_rust import (RUST_TOOLCHAIN_OUT_DIR, THIRD_PARTY_DIR) # Get variables and helpers from Clang update script sys.path.append( os.path.join(os.path.dirname(os.path.abspath(__file__)), '..', 'clang', 'scripts')) from build import (CheckoutGitRepo, DownloadAndUnpack, LLVM_BUILD_TOOLS_DIR, DownloadDebianSysroot, RunCommand) from update import (RmTree) # The git hash to use. BINDGEN_GIT_VERSION = 'f93d5dfa6d5d7409bea584f3eab38e1fc52b8360' BINDGEN_GIT_REPO = ('https://chromium.googlesource.com/external/' + 'github.com/rust-lang/rust-bindgen') BINDGEN_SRC_DIR = os.path.join(THIRD_PARTY_DIR, 'rust-toolchain-intermediate', 'bindgen-src') BINDGEN_HOST_BUILD_DIR = os.path.join(THIRD_PARTY_DIR, 'rust-toolchain-intermediate', 'bindgen-host-build') BINDGEN_CROSS_TARGET_BUILD_DIR = os.path.join(THIRD_PARTY_DIR, 'rust-toolchain-intermediate', 'bindgen-target-build') NCURSESW_CIPD_LINUX_AMD_PATH = 'infra/3pp/static_libs/ncursesw/linux-amd64' NCURSESW_CIPD_LINUX_AMD_VERSION = '6.0.chromium.1' RUST_BETA_SYSROOT_DIR = os.path.join(THIRD_PARTY_DIR, 'rust-toolchain-intermediate', 'beta-sysroot') EXE = '.exe' if sys.platform == 'win32' else '' def InstallRustBetaSysroot(rust_git_hash, target_triples): if os.path.exists(RUST_BETA_SYSROOT_DIR): RmTree(RUST_BETA_SYSROOT_DIR) InstallBetaPackage(FetchBetaPackage('cargo', rust_git_hash), RUST_BETA_SYSROOT_DIR) InstallBetaPackage(FetchBetaPackage('rustc', rust_git_hash), RUST_BETA_SYSROOT_DIR) for t in target_triples: InstallBetaPackage( FetchBetaPackage('rust-std', rust_git_hash, triple=t), RUST_BETA_SYSROOT_DIR) def FetchNcurseswLibrary(): assert sys.platform.startswith('linux') ncursesw_dir = os.path.join(LLVM_BUILD_TOOLS_DIR, 'ncursesw') ncursesw_url = (f'{CIPD_DOWNLOAD_URL}/{NCURSESW_CIPD_LINUX_AMD_PATH}' f'/+/version:2@{NCURSESW_CIPD_LINUX_AMD_VERSION}') if os.path.exists(ncursesw_dir): RmTree(ncursesw_dir) DownloadAndUnpack(ncursesw_url, ncursesw_dir, is_known_zip=True) return ncursesw_dir def RunCargo(cargo_args): """Invokes `cargo` produced by an earlier `build_rust.py` step. Note that this is different from the `RunCargo` function in `//tools/crates/run_cargo.py` which works from within a Chromium repo, but wouldn't work on the toolchain bots. Note that some environment variables populated below are not necessary for all users of this function (e.g. `build_vet.py` doesn't need clang/llvm parts). That's a bit icky, but ultimately okay. """ ncursesw_dir = None if sys.platform.startswith('linux'): ncursesw_dir = FetchNcurseswLibrary() cargo_bin = os.path.join(RUST_TOOLCHAIN_OUT_DIR, 'bin', f'cargo{EXE}') rustc_bin = os.path.join(RUST_TOOLCHAIN_OUT_DIR, 'bin', f'rustc{EXE}') if not os.path.exists(cargo_bin): print(f'Missing cargo at {cargo_bin}. This ' f'script expects to be run after build_rust.py is run as ' f'the build_rust.py script builds cargo that is needed here.') sys.exit(1) if not os.path.exists(rustc_bin): print(f'Missing rustc at {rustc_bin}. This ' f'script expects to be run after build_rust.py is run as ' f'the build_rust.py script builds rustc that is needed here.') sys.exit(1) clang_bins_dir = os.path.join(RUST_HOST_LLVM_INSTALL_DIR, 'bin') llvm_dir = RUST_HOST_LLVM_INSTALL_DIR if not os.path.exists(os.path.join(llvm_dir, 'bin', f'llvm-config{EXE}')): print(f'Missing llvm-config in {llvm_dir}. This ' f'script expects to be run after build_rust.py is run as ' f'the build_rust.py script produces the LLVM libraries that ' f'are needed here.') sys.exit(1) env = collections.defaultdict(str, os.environ) # Cargo normally stores files in $HOME. Override this. env['CARGO_HOME'] = CARGO_HOME_DIR # Use a rustc we deterministically provide, not a system one. env['RUSTC'] = rustc_bin # Use the LLVM libs and clang compiler from the rustc build. env['LLVM_CONFIG_PATH'] = os.path.join(llvm_dir, 'bin', 'llvm-config') if sys.platform == 'win32': env['LIBCLANG_PATH'] = os.path.join(llvm_dir, 'bin') else: env['LIBCLANG_PATH'] = os.path.join(llvm_dir, 'lib') env['LIBCLANG_STATIC_PATH'] = os.path.join(llvm_dir, 'lib') if sys.platform == 'win32': env['CC'] = os.path.join(clang_bins_dir, 'clang-cl') env['CXX'] = os.path.join(clang_bins_dir, 'clang-cl') else: env['CC'] = os.path.join(clang_bins_dir, 'clang') env['CXX'] = os.path.join(clang_bins_dir, 'clang++') # Windows uses lld-link for MSVC compat. Otherwise, we use lld via clang. if sys.platform == 'win32': linker = os.path.join(clang_bins_dir, 'lld-link') else: linker = os.path.join(clang_bins_dir, 'clang') env['LDFLAGS'] += ' -fuse-ld=lld' env['RUSTFLAGS'] += ' -Clink-arg=-fuse-ld=lld' env['LD'] = linker env['RUSTFLAGS'] += f' -Clinker={linker}' if sys.platform.startswith('linux'): # We use these flags to avoid linking with the system libstdc++. sysroot = DownloadDebianSysroot('amd64') sysroot_flag = f'--sysroot={sysroot}' env['CFLAGS'] += f' {sysroot_flag}' env['CXXFLAGS'] += f' {sysroot_flag}' env['LDFLAGS'] += f' {sysroot_flag}' env['RUSTFLAGS'] += f' -Clink-arg={sysroot_flag}' if ncursesw_dir: env['CFLAGS'] += f' -I{ncursesw_dir}/include' env['CXXFLAGS'] += f' -I{ncursesw_dir}/include' env['LDFLAGS'] += f' -L{ncursesw_dir}/lib' env['RUSTFLAGS'] += f' -Clink-arg=-L{ncursesw_dir}/lib' if sys.platform == 'darwin': # The system/xcode compiler would find system SDK correctly, but # the Clang we've built does not. See # https://github.com/llvm/llvm-project/issues/45225 sdk_path = subprocess.check_output(['xcrun', '--show-sdk-path'], text=True).rstrip() env['CFLAGS'] += f' -isysroot {sdk_path}' env['CXXFLAGS'] += f' -isysroot {sdk_path}' env['LDFLAGS'] += f' -isysroot {sdk_path}' env['RUSTFLAGS'] += f' -Clink-arg=-isysroot -Clink-arg={sdk_path}' # This will `fail_hard` and not return if `cargo` reports problems. RunCommand([cargo_bin] + cargo_args, setenv=True, env=env) def main(): parser = argparse.ArgumentParser(description='Build and package bindgen') parser.add_argument( '--skip-checkout', action='store_true', help='skip downloading the git repo. Useful for trying local changes') args, rest = parser.parse_known_args() if not args.skip_checkout: CheckoutGitRepo("bindgen", BINDGEN_GIT_REPO, BINDGEN_GIT_VERSION, BINDGEN_SRC_DIR) build_dir = BINDGEN_HOST_BUILD_DIR if os.path.exists(build_dir): RmTree(build_dir) print(f'Building bindgen in {build_dir} ...') cargo_args = [ 'build', f'--manifest-path={BINDGEN_SRC_DIR}/Cargo.toml', f'--target-dir={build_dir}', f'--target={RustTargetTriple()}', f'--no-default-features', f'--features=logging', '--release', '--bin', 'bindgen', ] RunCargo(cargo_args) install_dir = os.path.join(RUST_TOOLCHAIN_OUT_DIR) print(f'Installing bindgen to {install_dir} ...') llvm_dir = RUST_HOST_LLVM_INSTALL_DIR shutil.copy( os.path.join(build_dir, RustTargetTriple(), 'release', f'bindgen{EXE}'), os.path.join(install_dir, 'bin')) if sys.platform == 'win32': shutil.copy(os.path.join(llvm_dir, 'bin', f'libclang.dll'), os.path.join(install_dir, 'bin')) elif sys.platform == 'darwin': shutil.copy(os.path.join(llvm_dir, 'lib', f'libclang.dylib'), os.path.join(install_dir, 'lib')) else: # Can't replace symlinks so remove existing ones. for filename in os.listdir(os.path.join(install_dir, 'lib')): if filename.startswith('libclang.so'): os.remove(os.path.join(install_dir, 'lib', filename)) for filename in os.listdir(os.path.join(llvm_dir, 'lib')): if filename.startswith('libclang.so'): shutil.copy(os.path.join(llvm_dir, 'lib', filename), os.path.join(install_dir, 'lib'), follow_symlinks=False) return 0 if __name__ == '__main__': sys.exit(main())