cargo build failed on Windows 10

[IntelMin]

Having the following issue while cargo install:

error: failed to run custom build command for `hotg-runecoral v0.3.10`

Caused by:
  process didn't exit successfully: `C:\Users\Intel\AppData\Local\Temp\cargo-installShKHE4\release\build\hotg-runecoral-9c87cb88ab6a269a\build-script-build` (exit code: 101)
  --- stderr
  thread 'main' panicked at 'called `Result::unwrap()` on an `Err` value: Error { kind: NotFound, message: "program not found" }', C:\Users\Intel\.cargo\registry\src\git.luolix.top-1ecc6299db9ec823\hotg-runecoral-0.3.10\build.rs:80:22
  note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
warning: build failed, waiting for other jobs to finish...
error: failed to compile `hotg-rune-cli v0.11.3`, intermediate artifacts can be found at `C:\Users\Intel\AppData\Local\Temp\cargo-installShKHE4`

Caused by:
  build failed

[Michael-F-Bryan]

Can you re-run the build with RUST_BACKTRACE=1 so we can see a stacktrace?

Based on the error message I'm guessing it is trying to run a program that isn't installed, probably Bazel.

[saidinesh5]

Hi, Are you on Windows 10 ?

Can you double check all these dependencies are installed for you?

• Visual Studio Build tools 2019
• Msys2
• choco install python llvm bazel
• pip install numpy
• rust

On Windows compilation is a little more tricky due to the path size limits ( bazelbuild/bazel#5163 ).
How we workaround this in CI and in local development is by manually building librunecoral first in some location like C:\src\

          mkdir -p dist/include
          mkdir -p dist/lib/windows/x86_64/
          bazel build --config windows //runecoral:runecoral
          cp runecoral/runecoral.h dist/include
          cp bazel-bin/runecoral/runecoral.lib dist/lib/windows/x86_64/

And then setting RUNECORAL_DIST_DIR environment variable to point to that dist dir while compiling rune

[IntelMin]

Installing Bazel fixed that issue, but still having another issue:

 ERROR: C:/librunecoral/WORKSPACE:72:23: fetching android_ndk_repository rule //external:androidndk: Either the path attribute of android_ndk_repository or the ANDROID_NDK_HOME environment variable must be set.
INFO: Repository go_sdk instantiated at:
  C:/librunecoral/WORKSPACE:30:14: in <toplevel>
  C:/users/intel/_bazel_intel/ebrudqsq/external/org_tensorflow/tensorflow/workspace0.bzl:120:20: in workspace
  C:/users/intel/_bazel_intel/ebrudqsq/external/com_github_grpc_grpc/bazel/grpc_extra_deps.bzl:36:27: in grpc_extra_deps
  C:/users/intel/_bazel_intel/ebrudqsq/external/io_bazel_rules_go/go/toolchain/toolchains.bzl:379:28: in go_register_toolchains
  C:/users/intel/_bazel_intel/ebrudqsq/external/io_bazel_rules_go/go/private/sdk.bzl:65:21: in go_download_sdk
Repository rule _go_download_sdk defined at:
  C:/users/intel/_bazel_intel/ebrudqsq/external/io_bazel_rules_go/go/private/sdk.bzl:53:35: in <toplevel>
ERROR: Analysis of target '//runecoral:runecoral' failed; build aborted: Either the path attribute of android_ndk_repository or the ANDROID_NDK_HOME environment variable must be set.
INFO: Elapsed time: 2129.796s
INFO: 0 processes.
FAILED: Build did NOT complete successfully (7 packages loaded, 11 targets configured)
    currently loading: @bazel_tools//tools/jdk
    Fetching @local_execution_config_python; fetching
    Fetching @local_config_python; Restarting.
    Fetching ...docker; Cloning 9bfcd7dbf0294ed9d11a99da6363fc28df904502 of https://github.com/bazelbuild/rules_docker\
.git
    Fetching https://dl.google.com/go/go1.12.5.windows-amd64.zip

Does it require android ndk as well?

[IntelMin]

Hi, Are you on Windows 10 ?

Can you double check all these dependencies are installed for you?

• Visual Studio Build tools 2019
• Msys2
• choco install python llvm bazel
• pip install numpy
• rust

On Windows compilation is a little more tricky due to the path size limits ( bazelbuild/bazel#5163 ). How we workaround this in CI and in local development is by manually building librunecoral first in some location like C:\src\

          mkdir -p dist/include
          mkdir -p dist/lib/windows/x86_64/
          bazel build --config windows //runecoral:runecoral
          cp runecoral/runecoral.h dist/include
          cp bazel-bin/runecoral/runecoral.lib dist/lib/windows/x86_64/

And then setting RUNECORAL_DIST_DIR environment variable to point to that dist dir while compiling rune

Installed all dependencies mentioned above, but still having issue with Android NDK.
I can not find any instruction about Android NDK in docs.

[saidinesh5]

Ahh I think that's an issue with newer version of bazel. It looks for ANDROID_NDK because we have https://github.com/hotg-ai/librunecoral/blob/master/WORKSPACE#L72 this line. just comment that out and you can build for windows.

I will fix this issue later properly

[IntelMin]

Thanks for commenting.
Anyway, I fixed that issue by setting ANDROID_NDK_HOME system path to my local ndk directory.

Finally, it builds successfully and I am ready to go!