Caleb Xu 90c25bf913 std: use HOMEBREW_ARCH env var on Linux
Unlike macOS, Linux installations can be installed/deployed on a
variety of hardware. The HOMEBREW_ARCH environment variable
allows the end user to set a custom -march=... option for the
compiler. If the variable is not set, it defaults to "native".

This only applies on Linux; on macOS, behavior remains unchanged.
2018-09-05 16:06:11 -04:00
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2018-09-05 16:06:11 -04:00