openssl 版本号区别

8. How does the versioning scheme work? 

After the release of OpenSSL 1.0.0 the versioning scheme changed. Letter releases (e.g. 1.0.1a) can only contain bug and security fixes and no new features. Minor releases change the last number (e.g. 1.0.2) and can contain new features that retain binary compatibility. Changes to the middle number are considered major releases and neither source nor binary compatibility is guaranteed.

Therefore the answer to the common question "when will feature X be backported to OpenSSL 1.0.0/0.9.8?" is "never" but it could appear in the next minor release.

9. What happens when the letter release reaches z? 

It was decided after the release of OpenSSL 0.9.8y the next version should be 0.9.8za then 0.9.8zb and so on.

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