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- # Versioning
-
- ## Since 2.23.0
-
- SDL follows an "odd/even" versioning policy, similar to GLib, GTK, Flatpak
- and older versions of the Linux kernel:
-
- * The major version (first part) increases when backwards compatibility
- is broken, which will happen infrequently.
-
- * If the minor version (second part) is divisible by 2
- (for example 2.24.x, 2.26.x), this indicates a version of SDL that
- is believed to be stable and suitable for production use.
-
- * In stable releases, the patchlevel or micro version (third part)
- indicates bugfix releases. Bugfix releases should not add or
- remove ABI, so the ".0" release (for example 2.24.0) should be
- forwards-compatible with all the bugfix releases from the
- same cycle (for example 2.24.1).
-
- * The minor version increases when new API or ABI is added, or when
- other significant changes are made. Newer minor versions are
- backwards-compatible, but not fully forwards-compatible.
- For example, programs built against SDL 2.24.x should work fine
- with SDL 2.26.x, but programs built against SDL 2.26.x will not
- necessarily work with 2.24.x.
-
- * If the minor version (second part) is not divisible by 2
- (for example 2.23.x, 2.25.x), this indicates a development prerelease
- of SDL that is not suitable for stable software distributions.
- Use with caution.
-
- * The patchlevel or micro version (third part) increases with
- each prerelease.
-
- * Each prerelease might add new API and/or ABI.
-
- * Prereleases are backwards-compatible with older stable branches.
- For example, 2.25.x will be backwards-compatible with 2.24.x.
-
- * Prereleases are not guaranteed to be backwards-compatible with
- each other. For example, new API or ABI added in 2.25.1
- might be removed or changed in 2.25.2.
- If this would be a problem for you, please do not use prereleases.
-
- * Only upgrade to a prerelease if you can guarantee that you will
- promptly upgrade to the stable release that follows it.
- For example, do not upgrade to 2.23.x unless you will be able to
- upgrade to 2.24.0 when it becomes available.
-
- * Software distributions that have a freeze policy (in particular Linux
- distributions with a release cycle, such as Debian and Fedora)
- should usually only package stable releases, and not prereleases.
-
- ## Before 2.23.0
-
- Older versions of SDL followed a similar policy, but instead of the
- odd/even rule applying to the minor version, it applied to the patchlevel
- (micro version, third part). For example, 2.0.22 was a stable release
- and 2.0.21 was a prerelease.
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