No valid cpus

[joetoth]

I just tried and got the following error.

~/projects/rules_emscripten master $ bazel build :helloworld.html
ERROR: No default_toolchain found for cpu 'emscripten'. Valid cpus are: [
]
INFO: Elapsed time: 0.099s
INFO: 0 processes.
FAILED: Build did NOT complete successfully (0 packages loaded)

bazel version 0.17.1

Let me know if there is anything else you need.

Thanks!

[tdresser]

I think this is due to a missing default_toolchain entry in CROSSTOOL. I haven't managed to get this to work just adding it though.

I suspect the CROSSTOOL format has changed since this was authored?

[tdresser]

This seems to be working.

bazel build src/test_wasm.js \
              --crosstool_top=@emscripten//toolchain:emscripten \
              --compiler=emscripten \
              --cpu=emscripten \
              --host_crosstool_top=@bazel_tools//tools/cpp:toolchain

Looks like you need to specify both the compiler and cpu for this to work.
I was also missing the --host_crosstool_top from the provided bazelrc for a while, which wasn't helping.

I think this is mainly a case of missing documentation.