gcc4 plugin: add README

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Boris Nagaev 2017-01-25 01:11:54 +01:00
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# Notes about GCC version 4.9.4
GCC 4.9.4 was used before [GCC 5.4.0](https://github.com/mxe/mxe/pull/1541).
This plugin is a backup in case of problems with GCC 5.4.0.
The only package known not to work with this plugin is hyperscan.
It was changed to work with GCC 5.4.0 (`-latomic` was added) and
that change broke support of GCC 4.9.4.
See [the comment](https://github.com/mxe/mxe/pull/1541#issuecomment-274389620).