freebsd-src/.clean_build_epoch
Kyle Evans 0090096e52 build: introduce the notion of a build epoch
Idea and file format shamelessly stolen from CheriBSD, but reimplemented
in terms of the standard FreeBSD build system.  We'll use this in some
events that call for a deeper cleansing, typically reserved for
situations where the dependencies are too complicated to unwind.  This
notably does not preclude us from doing separate cleansing of world for
specific src.conf(5) knob changes that would require a rebuild.

In the FreeBSD version, we either stamp the OBJTOP we're cleaning
(bootstrap or the full OBJDIR) with the current epoch and bail out for
unstamped objdirs, or we compare and either `rm -rf` or `cleandir` as
necessary.

Reviewed by:	brooks, des
Differential Revision:	https://reviews.freebsd.org/D51848
2025-08-14 23:43:42 -05:00

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# Add a new line containing a larger number than the last (e.g. YYYYMMDD) for
# every change that breaks ABI or requires a full rebuild for some other reason.
# Only the last entry is required, but having the full list may be useful for
# looking at frequency of ABI breakage, etc.
# 4757b351ea9: openssl: Import version 3.5.1
20250807 # All OpenSSL-using bits need rebuilt