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Proposed change(s)
This fixes builds of ONNX on OS X while installing ml-agents.
OS X builds use Xcode by default, and the Xcode compiler defaults to using C++98 mode for C++ ( https://stackoverflow.com/a/21349148 ). This causes errors building protocol buffer libraries, which need to be compiled with support for C++14 or newer ( protocolbuffers/protobuf#12393 (comment) ).
This ONNX commit changes its compilation to use C++14 mode: releases that include this commit (1.15.0 or newer) build with Xcode by default.
ONNX 1.15.0 uses a newer protocol buffer library, so allow newer versions here too.
Useful links (Github issues, JIRA tickets, ML-Agents forum threads etc.)
Types of change(s)
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