Meets issue while cross compile arm64

[Eric Guo]

Hi,

I'm trying to build angle for arm64 linux system

args.gn:

is_component_build = true
target_os="linux"
target_cpu = "arm64"
is_debug = false
angle_assert_always_on = false
is_clang = false
sysroot = "xxx"
custom_toolchain="//build/toolchain/linux/unbundle:default"
host_toolchain="//build/toolchain/linux/unbundle:default"

Set up my cross-compiler through environment variable CC CXX CFLAGS and so on. This config help me complete compile  3000+ files until I meet below error.

I know this issue occured because my x86 server trying to execute an aarch64 executable. Could anyone told me how should I modify gn args to fix this issue? Thanks.

[3616/6341] ACTION //third_party/catapult/tracing/tracing/proto:histogram_proto_gen(//build/toolchain/linux/unbundle:default)
FAILED: gen/tracing/tracing/proto/histogram.pb.h gen/tracing/tracing/proto/histogram.pb.cc pyproto/tracing/tracing/proto/histogram_pb2.py
python3 ../../tools/protoc_wrapper/protoc_wrapper.py histogram.proto --protoc ./protoc --proto-in-dir ../../third_party/catapult/tracing/tracing/proto --cc-out-dir gen/tracing/tracing/proto --py-out-dir pyproto/tracing/tracing/proto
Traceback (most recent call last):
  File "/opt/angle/out/Debug/../../tools/protoc_wrapper/protoc_wrapper.py", line 216, in <module>
    main(sys.argv[1:])
  File "/opt/angle/out/Debug/../../tools/protoc_wrapper/protoc_wrapper.py", line 194, in main
    ret = subprocess.call(protoc_cmd)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/fsl-imx-internal-xwayland/6.12-styhead/sysroots/x86_64-pokysdk-linux/usr/lib/python3.12/subprocess.py", line 389, in call
    with Popen(*popenargs, **kwargs) as p:
         ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/fsl-imx-internal-xwayland/6.12-styhead/sysroots/x86_64-pokysdk-linux/usr/lib/python3.12/subprocess.py", line 1026, in __init__
    self._execute_child(args, executable, preexec_fn, close_fds,
  File "/opt/fsl-imx-internal-xwayland/6.12-styhead/sysroots/x86_64-pokysdk-linux/usr/lib/python3.12/subprocess.py", line 1955, in _execute_child
    raise child_exception_type(errno_num, err_msg, err_filename)
OSError: [Errno 8] Exec format error: '/opt/angle/out/Debug/protoc'

[Yuly Novikov]

linux arm64 builds aren't officially supported.

non-clang builds aren't officially supported either.

One thing you could try is to add

target_cpu = ['arm64']

in your .gclient file and then run 'gclient sync'.

Not sure how much it would help, though.

The failure you see is in 'third_party/catapult', which is used only in tests, so the failure can be avoided by not building it.

If all you want to build is libEGL.so, libGLESv2.so, then you should run `autoninja -C out/Debug angle'.

Or "out/Release", since you set "is_debug = false"?

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