colab libcoral c++ build examples error

[gsirocco]

Description

I'm trying to run the build examples in colablink(https://colab.research.google.com/github/google-coral/tutorials/blob/master/build_cpp_examples.ipynb) but am now getting an error as below. This used to work, but now seems to be broken? Thanks!

Click to expand!

Issue Type

Build/Install

Operating System

Windows 10

Coral Device

M.2 Accelerator B+M

Other Devices

No response

Programming Language

C++

Relevant Log Output

bazel build --compilation_mode=opt --cpu=aarch64 --copt=-ffp-contract=off //coral/examples:two_models_one_tpu \
                                 //coral/examples:two_models_two_tpus_threaded \
                                 //coral/examples:model_pipelining \
                                 //coral/examples:classify_image \
                                 //coral/examples:backprop_last_layer
Extracting Bazel installation...
Starting local Bazel server and connecting to it...
WARNING: ignoring LD_PRELOAD in environment.
Loading: 0 packages loaded
Analyzing: 5 targets (5 packages loaded, 6 targets configured)
ERROR: /root/.cache/bazel/_bazel_root/db282089ccf9ceac8a40bd53ba7e80db/external/bazel_tools/platforms/BUILD:19:6: in alias rule @bazel_tools//platforms:x86_64: Constraints from @bazel_tools//platforms have been removed. Please use constraints from @platforms repository embedded in Bazel, or preferably declare dependency on https://github.com/bazelbuild/platforms. See https://github.com/bazelbuild/bazel/issues/8622 for details.
ERROR: /root/.cache/bazel/_bazel_root/db282089ccf9ceac8a40bd53ba7e80db/external/bazel_tools/platforms/BUILD:19:6: Analysis of target '@bazel_tools//platforms:x86_64' failed
ERROR: /content/libcoral/coral/examples/BUILD:46:10: While resolving toolchains for target //coral/examples:two_models_two_tpus_threaded: Target @local_execution_config_platform//:platform was referenced as a platform, but does not provide PlatformInfo
ERROR: Analysis of target '//coral/examples:two_models_two_tpus_threaded' failed; build aborted: 
INFO: Elapsed time: 38.000s
INFO: 0 processes.
FAILED: Build did NOT complete successfully (7 packages loaded, 8 targets conf\
igured)
Makefile:99: recipe for target 'examples' failed
make: *** [examples] Error 1

[hjonnala]

Seems to be issues with the latest bazel version. Please try replacing the install bazel section with below:

! wget -O /bazel https://github.com/bazelbuild/bazel/releases/download/4.0.0/bazel-4.0.0-installer-linux-x86_64.sh && \
    bash /bazel && \
    rm -f /bazel

[gsirocco]

Thanks, this fixed the issue!!

[google-coral-bot]

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