MFC: r306375

Add a WITHOUT_DIALOG src.conf(5) knob.

It also turns off dependencies (bsdinstall, bsdconfig, dpv, tzsetup).

MFC: r285684 (partial)

Record dependencies of gdb/gdbtui/kgdb on binutils/lib{bfd,iberty,opcodes},
fixing parallel builds.

Merge r267482,r267483,r267486,r267577,r267671,r267672 from head:

Remove send-pr and fix up all references to it. Replace it with a
stub send-pr directing people towards the web site.

MFC r264741: Add placeholder Kyuafiles for various top-level hierarchies.

This is "make tinderbox" clean.

MFC r263778:

Add a SUBDIR_PARALLEL option to bsd.subdir.mk, to allow make to process
all the SUBDIR entries in parallel, instead of serially. Apply this
option to a selected number of Makefiles, which can greatly speed up the
build on multi-core machines, when using make -j.

This can be extended to more Makefiles later on, whenever they are
verified to work correctly with parallel building.

I tested this on a 24-core machine, with make -j48 buildworld (N = 6):

before stddev after stddev
======= ====== ======= ======
real time 1741.1 16.5 959.8 2.7
user time 12468.7 16.4 14393.0 16.8
sys time 1825.0 54.8 2110.6 22.8

(user+sys)/real 8.2 17.1

E.g. the build was approximately 45% faster in real time. On machines
with less cores, or with lower -j settings, the speedup will not be as
impressive. But at least you can now almost max out a machine with
buildworld!

Submitted by: jilles

MFC r263833:

Enable parallel building for gnu/usr.bin and usr.bin/clang too.

Merge r267482,r267483,r267486,r267577,r267671,r267672 from head:

Remove send-pr and fix up all references to it. Replace it with a
stub send-pr directing people towards the web site.

MFC r264741: Add placeholder Kyuafiles for various top-level hierarchies.

This is "make tinderbox" clean.

MFC r263778:

Add a SUBDIR_PARALLEL option to bsd.subdir.mk, to allow make to process
all the SUBDIR entries in parallel, instead of serially. Apply this
option to a selected number of Makefiles, which can greatly speed up the
build on multi-core machines, when using make -j.

This can be extended to more Makefiles later on, whenever they are
verified to work correctly with parallel building.

I tested this on a 24-core machine, with make -j48 buildworld (N = 6):

before stddev after stddev
======= ====== ======= ======
real time 1741.1 16.5 959.8 2.7
user time 12468.7 16.4 14393.0 16.8
sys time 1825.0 54.8 2110.6 22.8

(user+sys)/real 8.2 17.1

E.g. the build was approximately 45% faster in real time. On machines
with less cores, or with lower -j settings, the speedup will not be as
impressive. But at least you can now almost max out a machine with
buildworld!

Submitted by: jilles

MFC r263833:

Enable parallel building for gnu/usr.bin and usr.bin/clang too.