Re: i386 9.99.17 build fails for NET4501 kernel

[Patrick Welche <prlw1%cam.ac.uk@localhost>]

On Sun, Oct 13, 2019 at 04:31:08PM -0500, John D. Baker wrote:
> 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;

I can reproduce this on amd64 with:

include "arch/amd64/conf/GENERIC"
no options      DIAGNOSTIC


Cheers,

Patrick