I saw this few weeks ago with -STABLE.
It's only recently that make delete-old delete debug
files, so it might started a lot earlier that we think.
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Sent from: http://freebsd.1045724.x6.nabble.com/freebsd-current-f3875308.html
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Setting
WITHOUT_DEBUG_FILES=YES
in /etc/src.conf is supposed to prevent building debug files for shared
libs and binaries - that is my interpretation of the manpage of
src.conf(5).
After each run of
buildworld buildkernel && installkernel && installworld
and performing a
make delete-old