[FR]: --gtest_stream_result_to support on macOS

[davidben]

Does the feature exist in the most recent commit?

No

Why do we need this feature?

We're evaluating ways to report GTest test results more robustly in BoringSSL. The JSON format is an option but it doesn't work when the test binary crashes.

--gtest_stream_result_to would avoid that (edit: though it seems to not include other output, so maybe it's not what we want?), but there's no Windows and macOS support. Looks like someone's got Windows support in #3989. Missing macOS support seems to just be a mistake in GTest. (See below)

Describe the proposal.

There doesn't seem to be any real reason this feature doesn't work on macOS. GTEST_CAN_STREAM_RESULTS_ isn't defined for GTEST_OS_MAC, but if I fix that, it works just fine. It's just based on sockets. This seems to just have been an oversight in GTest.
https://github.com/google/googletest/blob/main/googletest/include/gtest/internal/gtest-port.h#L692-L700

Is the feature specific to an operating system, compiler, or build system version?

macOS