Building the NET4501 kernel with 9.99.17 sources fails with:
[...]
# compile NET4501/vm_machdep.o
/r0/build/current/tools/amd64/bin/i486--netbsdelf-gcc -msoft-float -mno-mmx
-mno-sse -mno-avx -ffreestanding -fno-zero-initialized-in-bss
-fno-delete-null-pointer-checks -g -Os -fstack-protector -Wstack-protector
--param ssp-buffer-size=1 -fno-strict-aliasing -fno-common -std=gnu99 -Werror
-Wall -Wno-main -Wno-format-zero-length -Wpointer-arith -Wmissing-prototypes
-Wstrict-prototypes -Wold-style-definition -Wswitch -Wshadow -Wcast-qual
-Wwrite-strings -Wno-unreachable-code -Wno-pointer-sign -Wno-attributes -Wextra
-Wno-unused-parameter -Wold-style-definition -Wno-sign-compare
--sysroot=/r0/build/current/DEST/i386 -Di386 -I.
-I/x/current/src/sys/external/bsd/acpica/dist
-I/x/current/src/sys/external/bsd/libnv/dist
-I/x/current/src/sys/../common/lib/libx86emu
-I/x/current/src/sys/../common/lib/libc/misc
-I/x/current/src/sys/../common/include -I/x/current/src/sys/arch
-I/x/current/src/sys -nostdinc -DCOMPAT_UTILS -DTIMER_FREQ=1189200 -DCOMPAT_44
-D_KERNEL -D_KERNEL_OPT -std=gnu99
-I/x/current/src/sys/lib/libkern/../../../common/lib/libc/quad
-I/x/current/src/sys/lib/libkern/../../../common/lib/libc/string
-I/x/current/src/sys/lib/libkern/../../../common/lib/libc/arch/i386/string
-D_FORTIFY_SOURCE=2 -I/x/current/src/sys/external/isc/atheros_hal/dist
-I/x/current/src/sys/external/isc/atheros_hal/ic
-I/x/current/src/sys/external/bsd/libnv/dist -c
/x/current/src/sys/arch/x86/x86/vm_machdep.c -o vm_machdep.o
/x/current/src/sys/arch/x86/x86/vm_machdep.c: In function 'cpu_lwp_fork':
/x/current/src/sys/arch/x86/x86/vm_machdep.c:134:21: error: variable 'pcb2'
might be clobbered by 'longjmp' or 'vfork' [-Werror=clobbered]
struct pcb *pcb1, *pcb2;
^~~~
cc1: all warnings being treated as errors
*** [vm_machdep.o] Error code 1
nbmake: stopped in /r0/build/current/obj/i386/sys/arch/i386/compile/NET4501
1 error
nbmake: stopped in /r0/build/current/obj/i386/sys/arch/i386/compile/NET4501
ERROR: Failed to make all in
"/r0/build/current/obj/i386/sys/arch/i386/compile/NET4501"
*** BUILD ABORTED ***
--
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