Was trying to make a custom kernel for a test machine that was previously running FreeBSD 7.0 CURRENT.
cd /usr/src
make buildkernel KERNCONF=GDE_LB
The end result was something like this:
>>> stage 3.1: making dependencies
--------------------------------------------------------------
cd /usr/obj/usr/src/sys/GDE_LB; MAKEOBJDIRPREFIX=/usr/obj MACHINE_ARCH=i386 MACHINE=i386 CPUTYPE= GROFF_BIN_PATH=/usr/obj/usr/src/tmp/legacy/usr/bin GROFF_FONT_PATH=/usr/obj/usr/src/tmp/legacy/usr/share/groff_font GROFF_TMAC_PATH=/usr/obj/usr/src/tmp/legacy/usr/share/tmac _SHLIBDIRPREFIX=/usr/obj/usr/src/tmp INSTALL="sh /usr/src/tools/install.sh" PATH=/usr/obj/usr/src/tmp/legacy/usr/sbin:/usr/obj/usr/src/tmp/legacy/usr/bin:...: make KERNEL=kernel depend -DNO_MODULES_OBJ
machine -> /usr/src/sys/i386/include
cc -c -O2 -pipe -fno-strict-aliasing -std=c99 -Wall -Wredundant-decls -Wnested-externs -Wstrict-prototypes -Wmissing-prototypes -Wpointer-arith -Winline -Wcast-qual -Wundef -Wno-pointer-sign -fformat-extensions -nostdinc -I. -I/usr/src/sys -I/usr/src/sys/contrib/altq -I/usr/src/sys/contrib/ipfilter -I/usr/src/sys/contrib/pf -I/usr/src/sys/dev/ath -I/usr/src/sys/contrib/ngatm -I/usr/src/sys/dev/twa -I/usr/src/sys/gnu/fs/xfs/FreeBSD -I/usr/src/sys/gnu/fs/xfs/FreeBSD/support -I/usr/src/sys/gnu/fs/xfs -D_KERNEL -DHAVE_KERNEL_OPTION_HEADERS -include opt_global.h -finline-limit=8000 --param inline-unit-growth=100 --param large-function-growth=1000 -mno-align-long-strings -mpreferred-stack-boundary=2 -mno-mmx -mno-3dnow -mno-sse -mno-sse2 -mno-sse3 -ffreestanding /usr/src/sys/i386/i386/genassym.c
cc1: error: unrecognized command line option "-Wno-pointer-sign"
*** Error code 1
After some hair pulling, it turns out that make clean is not always enough:
rm -rf /usr/obj
cd /usr/src
make buildworld
make buildkernel KERNCONF=GDE_LB
And voila! Hope it helps someone.
