编译FreeBSD调试版内核

cd /usr/src/sys/amd64/conf
mkdir /root/kernels
cp GENERIC /root/kernels/KERNELD
ln -s /root/kernels/KERNELD

edit KERNELD
#添加:
makeoptions     DEBUG=-g
options         DDB
options         GDB

/usr/sbin/config KERNELD
cd ../compile/KERNELD
make cleandepend
make depend
make

#编译完成后,/usr/src/sys/amd64/compile/KERNELD目录里会有kernel.debug