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With57ec9254eb(docs: introduce document to announce breaking changes, 2024-06-14), we have introduced a new document that tracks upcoming breaking changes in the Git project. In2454970930(BreakingChanges: early adopter option, 2024-10-11) we have amended the document a bit to mention that any introduced breaking changes must be accompanied by logic that allows us to enable the breaking change at compile-time. While we already have two breaking changes lined up, neither of them has such a switch because they predate those instructions. Introduce the proposed `WITH_BREAKING_CHANGES` preprocessor macro and wire it up with both our Makefiles and Meson. This does not yet wire up the build flag for existing deprecations. Signed-off-by: Patrick Steinhardt <ps@pks.im> Signed-off-by: Junio C Hamano <gitster@pobox.com>