Compiling on Jetson TX1 aarch64 kernel with arm32 userspace fails

[wtfuzz]

ubuntu@tegra-ubuntu:~$ uname -a
Linux tegra-ubuntu 3.10.67-g458d45c #1 SMP PREEMPT Mon Feb 8 17:44:18 PST 2016 aarch64 aarch64 aarch64 GNU/Linux

protobuf 3.0.0-beta-2 was compiled with --enable-shared=no, and static protoc copied into ~/bazel/third-party/protobuf/protoc-linux-arm32.exe

ubuntu@tegra-ubuntu:~/bazel-0.2.2$ ./compile.sh
INFO: You can skip this first step by providing a path to the bazel binary as second argument:
INFO:    ./compile.sh compile /path/to/bazel
🍃  Building Bazel from scratch......
🍃  Building Bazel with Bazel.
ERROR: No toolchain found for cpu 'arm'. Valid cpus are: [
  k8,
  armeabi-v7a,
].
INFO: Elapsed time: 5.387s

Building output/bazel

[kchodorow]

This sounds similar to #1251, based on https://github.com/bazelbuild/bazel/blob/master/tools/cpp/CROSSTOOL#L26-L27 I'm guess we need to make "arm" return k8, too, but assigning to @damienmg for followup since I'm not too familiar with the CROSSTOOL stuff.

[wtfuzz]

I did get it work. There were a few things that needed to be done.

This fork compiles on arm:
https://github.com/wtfuzz/bazel

Sent from my iPhone

On May 16, 2016, at 8:56 AM, Kristina notifications@github.com wrote:

This sounds similar to #1251, based on https://github.com/bazelbuild/bazel/blob/master/tools/cpp/CROSSTOOL#L26-L27 I'm guess we need to make "arm" return k8, too, but assigning to @damienmg for followup since I'm not too familiar with the CROSSTOOL stuff.

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[wtfuzz]

The main culprit was cc_configure.bzl which defaults to returning "k8" (i386) when it doesn't recognize any other arch.

wtfuzz@ddc37b2

On May 16, 2016, at 8:56 AM, Kristina notifications@github.com wrote:

This sounds similar to #1251, based on https://github.com/bazelbuild/bazel/blob/master/tools/cpp/CROSSTOOL#L26-L27 I'm guess we need to make "arm" return k8, too, but assigning to @damienmg for followup since I'm not too familiar with the CROSSTOOL stuff.

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[kchodorow]

Great! Would you like to submit it as a pull request?

[wtfuzz]

I'm traveling this week, but I'll get a PR submitted when I can.

On May 16, 2016, at 11:08 AM, Kristina notifications@github.com wrote:

Great! Would you like to submit it as a pull request?

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[damienmg]

Nice! ping me when you send it.

[syed-ahmed]

Hi,
I ran into a similar error on a Jetson TX1 board. It says "ERROR: No toolchain found for cpu 'unknown'". I will try rebuilding with this change by @wtfuzz. Do I still need to do this step: protobuf 3.0.0-beta-2 was compiled with --enable-shared=no, and static protoc copied into ~/bazel/third-party/protobuf/protoc-linux-arm32.exe? is bazel build limited to arm32 only?