https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=233339
Bug ID: 233339
Summary: genassym.o build race
Product: Base System
Version: CURRENT
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: kern
Assignee: b...@freebsd.org
Reporter: ma...@freebsd.org
I occasionally hit a kernel build failure when building a kernel from scratch
(i.e., no -DKERNFAST or anything like that). It manifests like this:
nm: 'genassym.o': No such file or directory
nm: 'genassym.o': No such file or directory
/usr/home/markj/src/freebsd-dev/sys/amd64/linux32/linux32_support.s:38:2:
error: expected relocatable expression
movl $-EFAULT,%eax
^
At this point, if I go into the objdir for linux.ko, I see an empty assym.inc
and no genassym.o. In kmod.mk we have:
480 assym.inc: genassym.o
481 offset.inc: genoffset.o
482 assym.inc: ${SYSDIR}/kern/genassym.sh
483 sh ${SYSDIR}/kern/genassym.sh genassym.o > ${.TARGET}
484 genassym.o: ${SYSDIR}/${MACHINE}/${MACHINE}/genassym.c offset.inc
485 genassym.o: ${SRCS:Mopt_*.h}
486 ${CC} -c ${CFLAGS:N-flto:N-fno-common} \
487 ${SYSDIR}/${MACHINE}/${MACHINE}/genassym.c
488 offset.inc: ${SYSDIR}/kern/genoffset.sh genoffset.o
489 sh ${SYSDIR}/kern/genoffset.sh genoffset.o > ${.TARGET}
490 genoffset.o: ${SYSDIR}/kern/genoffset.c
491 genoffset.o: ${SRCS:Mopt_*.h}
492 ${CC} -c ${CFLAGS:N-flto:N-fno-common} \
493 ${SYSDIR}/kern/genoffset.c
So, we *should* have compiled genassym.c before invoking genassym.sh (which is
where the nm(1) error above comes from), but that's not happening. The problem
seems to be that the dependency is satisfied by the kernel's genassym.o, which
is generated very early during the kernel build, so when building modules we
don't wait for the module's genassym.o to be created.
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