version - Does semantic versioning apply to source or binary compatibility? -


this question applies language written in 1 language ("source"), e.g. c or java, , distributed in ("binary"), e.g. machine code or java byte code, using dynamic linking.

suppose user using version of library. release newer version b.

if can compile code without change against b , correctly run b, change b said source compatible.

if can compile code against , correctly run b, change b said binary compatible. situation common when using transitive dependency graphs without isolated module loading (e.g. osgi). x compiled against versions of y , z, , y compiled against different version of z. @ runtime, y's calls z may not correct , may crash.

it possible changes source compatible, binary incompatible. possible changes source incompatible , binary compatible.

which compatibility use semantic versioning? use source compatibility differentiate between major , minor/patch updates, or use binary compatibility differentiate between major , minor/patch updates?

my current motivation scala library. scala binary compatibility can difficult analyze , requires understand of compiler details. source compatibility , binary incompatible common.

this isn't bizarre edge case; problem can appear in compiled, dynamically linked language.

a few months later, think have conclusion.

semantic versioning should consider both, , follow "most changed" one.

  • breaking source compilation incompatible change users of library.
  • breaking runtime execution incompatible change users of library.

if either source compatibility or binary compatibility changes, should -- according semantic versioning -- new major version.

in case scala, binary compatibility can rather difficult determine. there several jar api diffing tools, e.g. jdiff.


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