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openbsd has never, ever, ever, even once maintained binary compatibility; this is just a warning about source compatibility breaking

• JdeBP 1y ago
  You have this backwards. Source compatibility is not broken by such a change, with zero source changes required in order to accommodate it for almost all applications; and far from OpenBSD "never, ever, ever" maintaining binary compatibility Masahiko Yasuoka and Philip Guenther took deliberate steps in this very case to ensure as much binary compatibility as they could, retaining structure layouts as-is and retaining several symbols for library internals that macros used to reference, even those that won't be used by freshly recompiled applications. The warning, and the bumping of several shared library major version numbers, is most definitely about the standard streams breaking binary, not source as you have it, compatibility. Any newly compiled binary that is using the C standard streams won't run on old shared libraries because of the new symbol references for __stdin, __stdout, and __stderr.