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Allow cross-compilation of Linux arm64 builds on Linux x86_64 build hosts #13

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Allow cross-compilation of Linux arm64 builds on Linux x86_64 build hosts #13

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8359977
Allow cross-compilation of Linux arm64 builds on Linux x86_64 build h…
vldevel Oct 8, 2025
65e8e37
Fix missing symbol at runtime for arm64. Reimplement check_target.
vldevel Oct 8, 2025
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64 changes: 20 additions & 44 deletions build/run.py
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Original file line number Diff line number Diff line change
Expand Up @@ -812,14 +812,18 @@ def build_webrtc(
elif target in ('raspberry-pi-os_armv8',
'ubuntu-18.04_armv8',
'ubuntu-20.04_armv8'):
if platform.machine() in ['AMD64', 'x86_64']:
gn_args += [ 'host_cpu="x64"' ]
else: # Assume ARM64 build host
gn_args += [ 'host_cpu="arm64"' ]
gn_args += [
'host_os="linux"',
'target_os="linux"',
'host_cpu="arm64"',
'target_cpu="arm64"',
'use_custom_libcxx=false',
'use_custom_libcxx_for_host=false',
'clang_use_chrome_plugins=false',
'libyuv_use_sme=false',
'rtc_use_x11=false',
'rtc_use_pipewire=false',
'rtc_include_pulse_audio=false',
Expand Down Expand Up @@ -1070,50 +1074,20 @@ def package_webrtc(source_dir, build_dir, package_dir, target,

def check_target(target):
logging.debug(f'uname: {platform.uname()}')
logging.info(f'OS: {platform.system()}')

if platform.system() == 'Windows':
logging.info(f'OS: {platform.system()}')
return target in ['windows_x86_64', 'windows_x86', 'windows_arm64']
elif platform.system() == 'Darwin':
logging.info(f'OS: {platform.system()}')
return target in ('macos_x86_64', 'macos_arm64', 'ios', 'apple', 'apple_prefixed')
elif platform.system() == 'Linux':
release = read_version_file('/etc/os-release')
os = release['NAME']
logging.info(f'OS: {os}')
if os != 'Ubuntu':
return False

# x86_64 環境以外ではビルド不可
# Requires an x86_64 machine to build.
arch = platform.machine()
logging.info(f'Arch: {arch}')
if arch not in ('AMD64', 'x86_64'):
return False

# クロスコンパイルなので Ubuntu だったら任意のバージョンでビルド可能（なはず）
# Cross compiling: if it's Ubuntu, any version should be able to build the following targets (theoretically)
if target in ('ubuntu-18.04_armv8',
'ubuntu-20.04_armv8',
'raspberry-pi-os_armv6',
'raspberry-pi-os_armv7',
'raspberry-pi-os_armv8',
'android',
'android_prefixed'):
return True

# x86_64 用ビルドはバージョンが合っている必要がある
# Builds for x86_64 require the version to match.
osver = release['VERSION_ID']
logging.info(f'OS Version: {osver}')
if target == 'ubuntu-18.04_x86_64' and osver == '18.04':
return True
if target == 'ubuntu-20.04_x86_64' and osver == '20.04':
return True
if target == 'ubuntu-22.04_x86_64' and osver == '22.04':
return True

return False
return target in ('ubuntu-18.04_x86_64', 'ubuntu-20.04_x86_64', 'ubuntu-22.04_x86_64',
'ubuntu-18.04_armv8', 'ubuntu-20.04_armv8', 'raspberry-pi-os_armv8')
# These are untested/not catered for: 'android', 'android_prefixed',
# 'raspberry-pi-os_armv6', 'raspberry-pi-os_armv7'. They likely require
# cross-compiling on a x86_64 system, with the installation of a proper
# ARM system root (search for "install_sysroot" below to see how to
# proceed). HB
else:
return False

Expand Down Expand Up @@ -1188,11 +1162,8 @@ def main():
if not hasattr(args, 'op'):
parser.error('Required subcommand')

# Do not error out when the Linux distribution used to build the library is
# not known from the build system: we do not care since we use a virtual
# environment for the build... HB
#if not check_target(args.target):
# raise Exception(f'Target {args.target} is not supported on your platform')
if not check_target(args.target):
raise Exception(f'Target {args.target} is not supported on your platform')

configuration = 'debug' if args.debug else 'release'

Expand Down Expand Up @@ -1267,6 +1238,11 @@ def main():
webrtc_source_dir=webrtc_source_dir,
fetch=args.webrtc_fetch, force=args.webrtc_fetch_force)

if args.target in ['ubuntu-18.04_armv8', 'ubuntu-20.04_armv8', 'raspberry-pi-os_armv8']:
if platform.machine() in ['AMD64', 'x86_64']:
install_sysroot = os.path.join(source_dir, 'webrtc', 'src', 'build', 'linux', 'sysroot_scripts', 'install-sysroot.py')
cmd(['python3', install_sysroot, '--arch=arm64'])

# ビルド
# Build
build_webrtc_args = {
Expand Down