From owner-freebsd-hackers@FreeBSD.ORG  Sun Mar 26 09:44:01 2006
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Date: Sun, 26 Mar 2006 11:43:55 +0200
From: Divacky Roman <xdivac02@stud.fit.vutbr.cz>
To: hackers@freebsd.org
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Subject: precompiled header
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hi

why fbsd dont use precompiled headers during buildword/buildkernel? I just did
very naive test (which doesnt work for a lot of the headers)

cd /sys; find . -name \*.h -exec gcc -x c-header {} \;

time buildkernel

and delete those compiled headers and time buildkernel again

there is a speedup for the precompiled-headers case (but not very big) and I am sure if it 
was carefully integrated into the build (ie. compiling all headers) the
difference might be quite visible...

thnx

roman