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Alex Richardson authored
By using '__' instead of '.' as the separator we can also support systems that use dash as /bin/sh (it's the default shell on Ubuntu/Debian). Dash will unset any environment variables that use a non alphanumeric+undedscore character and therefore submakes will fail to import the COMPILER_* variables if we use '.' as the separator. Reviewed By: emaste Differential Revision: https://reviews.freebsd.org/D22381
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