Hello all,
I have been experimenting with FreeBSD build options on and off since
FreeBSD 4.8/5.0 for use with minimum jails and later virtual machines.
If you have ever tried to build "without all" and working your way back
up, you have probably found this to be a very frustrating adventure in
make-related failures after hours of compilation and, on the darkest
days, concurrent deletion bugs which would give a different error every
time you run a build.
Fortunately, with the help of people like Ed Maste, Bryan Drewery,
Bjoern Zeeb, Kyle Evans, and others, we have been gradually knocking
broken build options off of the lists generated by the
tools/tools/build_option_survey that PHK wrote long ago.
An annotated list of working and failing build options in FreeBSD
13.0-ALPHA1 can be found here:
https://callfortesting.org/results/bos-FreeBSD-13A1/
Two have been fixed and PRs exist for the majority of them with some
possible fixes for those who know the code best to consider. One broken
option is a recent regression while one pair,
WITHOUT_LIBTHR/WITHOUT_LIBPTHREAD is quite stale and is a candidate for
significant attention or possibly removal.
If you are wondering, as of 13.0-ALPHA1, the following KERNCONF and
generated /usr/src.conf are the minimum to build FreeBSD and build it in
a bhyve VM from a UFS-formatted disk image:
cpu HAMMER
ident LESSBSD
makeoptions MODULES_OVERRIDE="virtio"
options SCHED_ULE
device pci
device loop
device ether
device uart
device atpic
device ahci
device scbus
options GEOM_PART_GPT
options FFS
sh /usr/src/tools/tools/build_option_survey/listallopts.sh \
| grep -v WITH_ | sed 's/$/=YES/' | \
grep -v WITHOUT_AUTO_OBJ | \
grep -v WITHOUT_UNIFIED_OBJDIR | \
grep -v WITHOUT_CRYPT | \
grep -v WITHOUT_DYNAMICROOT | \
grep -v WITHOUT_LIBCPLUSPLUS | \
grep -v WITHOUT_INSTALLLIB | \
grep -v WITHOUT_LIBTHR | \
grep -v WITHOUT_LIBPTHREAD | \
grep -v WITHOUT_BOOT | \
grep -v WITHOUT_LOADER_LUA | \
grep -v WITHOUT_LOCALES | \
grep -v WITHOUT_ZONEINFO | \
grep -v WITHOUT_VI \
> /etc/src.conf
Explanation/Status:
WITHOUT_AUTO_OBJ and WITHOUT_UNIFIED_OBJDIR belong in src-env.conf and
kindly instantly warn you of this and terminate the build.
WITHOUT_DYNAMICROOT and WITHOUT_LIBCPLUSPLUS are fixed in CURRENT.
WITHOUT_INSTALLLIB and WITHOUT_LIBCPLUSPLUS should be easy to fix and
candidate syntax is in the PRs linked in the above link.
WITHOUT_CRYPT has regressed in recent months.
WITHOUT_LIBTHR and WITHOUT_LIBPTHREAD are challenges.
WITHOUT_BOOT onward are optional to build but are needed to boot the VM,
see a console, set the time zone, and optionally edit files.
The resulting kernel is 5M in size and the world and kernel are 90M.
Basic networking adds another 1M.
The build times on an EPYC 7402p are:
buildworld 1m43.34s Warm ARC: 1m33.73s
buildkernel 9.35s
installworld 18.75s
installkernel 0.32s
Total: 3m23.44s
Boot time: About three seconds
I sincerely hope that all build options worked at some point and, given
how much progress has been made, FreeBSD 13.0 can also support all
options, or at a minimum, abort the build early as appropriate as the
src-env.conf ones do.
Think of the Developers! Spare them continued frustration with these.
We can do this. I am happy to test any patches on multiple platforms. I
am also happy to send individuals my minimum VM script and fortunately,
it is out-of-date with every build option fix.
All the best,
Michael
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