Use exec_tools instead of tools for better RBE compatibility #4837
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I was running into issues building with Bazel on my Mac using a Linux RBE worker. The reason was that Bazel was uploading the Host platform's (Mac) Python executables and not the Execution Platform (Linux)'s Python executables. Thus, I was seeing an error like:
OSError: [Errno 8] Exec format errorThe tools attribute of genrules corresponds to the Host platform, but this is largely incorrect when using RBE. exec_tools matches the execution platform, which is what is desired here. If building without RBE, the Host and Execution platform will be the same, and the difference between
exec_toolsandtoolswill not matter.