I don't remember seeing this reported. Recent HEAD kernel build results in this error:
make[1]: "/usr/src/Makefile.inc1" line 337: SYSTEM_COMPILER: Determined that CC=cc matches the source tree. Not bootstrapping a cross-compiler. make[1]: "/usr/src/Makefile.inc1" line 342: SYSTEM_LINKER: Determined that LD=ld matches the source tree. Not bootstrapping a cross-linker. -------------------------------------------------------------- >>> Kernel build for ernst_new started on Wed Jul 7 12:53:52 CEST 2021 -------------------------------------------------------------- ===> ernst_new -------------------------------------------------------------- >>> stage 1: configuring the kernel -------------------------------------------------------------- Kernel build directory is /home/garyj/obj/usr/src/amd64.amd64/sys/ernst_new Don't forget to do ``make cleandepend && make depend'' -------------------------------------------------------------- >>> stage 2.3: build tools -------------------------------------------------------------- -------------------------------------------------------------- >>> stage 3.1: building everything -------------------------------------------------------------- linking kernel.full ld: error: undefined symbol: ktls_disable_ifnet >>> referenced by tcp_var.h:1161 (/usr/src/sys/netinet/tcp_var.h:1161) >>> tcp_output.o:(tcp_account_for_send) --- kernel.full --- *** [kernel.full] Error code 1 This is caused because ktls_disable_ifnet() is present in /sys/kern/uipc_ktls.c, which is included in the kernel build only when options kern_ktls is present in the config file. I do not have this option set. So, it's wrong to blindly call this function in tcp_var.h. Commenting out the relevant code results in a successful build. -- Gary Jennejohn
