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Previously this recipe was changed to do debug builds because otherwise insane warns that the binary is already stripped. However, debug builds for boost.build also pass -O0. It turns out that given how large Boost is (or, how bad boost.build is) doing a release build with -O3 knocks a third off the walltime for a Boost package in my test, mainly by reducing how long it spends deciding that nothing needs to be rebuilt in do_install: PKG TASK ABSDIFF RELDIFF WALLTIME1 -> WALLTIME2 boost do_install -330.7s -69.2% 477.6s -> 146.9s boost do_compile -7.1s -2.7% 269.3s -> 262.2s Replace debug mode with INSANE_SKIP=already-stripped. (From OE-Core rev: 66d583d1b2bc54cac278c30b5dbc9fde016eb6ee) Signed-off-by: Ross Burton <ross.burton@arm.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>