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Introduce an EXPERIMENTAL option for both src.conf(5) and the kernel.

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In the last decade(s) we have seen both short term or long term projects
committed to the tree which were considered or even marked "experimental".
While out-of-tree development has become easier than it used to be in
CVS times, there still is a need to have the code shipping with HEAD but
not enabled by default.

While people may think about VIMAGE as one of the recent larger, long term
projects, early protocol implementations (before they are standardised)
are others.  (Free)BSD historically was one of the operating systems
which would have running code at early stages and help develop and
influence standardisation and the industry.

Give developers an opportunity to be more pro-active for early adoption
or running large scale code changes stumbling over each others but not
the user's feet.  I have not added the option to NOTES in order to avoid
breaking supported option builds, which require constant compile testing.

Discussed with:	people in the corridor
This commit is contained in:
Bjoern A. Zeeb 2018-10-30 15:46:30 +00:00
parent 9436aa0e66
commit 43f75d57a2
4 changed files with 7 additions and 1 deletions
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4
share/man/man5/src.conf.5
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@ -1,6 +1,6 @@
.\" DO NOT EDIT-- this file is @generated by tools/build/options/makeman.
.\" $FreeBSD$
.Dd October 25, 2018
.Dd October 30, 2018
.Dt SRC.CONF 5
.Os
.Sh NAME
@ -659,6 +659,8 @@ An alternate bootstrap tool chain must be provided.
.It Va WITHOUT_EXAMPLES
Set to avoid installing examples to
.Pa /usr/share/examples/ .
.It Va WITH_EXPERIMENTAL
Set to include experimental features in the build.
.It Va WITH_EXTRA_TCP_STACKS
Set to build extra TCP stack modules.
.It Va WITHOUT_FDT

1
share/mk/src.opts.mk
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@ -197,6 +197,7 @@ __DEFAULT_NO_OPTIONS = \
BSD_GREP \
CLANG_EXTRAS \
DTRACE_TESTS \
EXPERIMENTAL \
GNU_GREP_COMPAT \
HESIOD \
LIBSOFT \

1
sys/conf/options
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@ -95,6 +95,7 @@ _COMPAT_LINUX32 opt_compat.h # XXX: make sure opt_compat.h exists
COMPILING_LINT opt_global.h
CY_PCI_FASTINTR
DEADLKRES opt_watchdog.h
EXPERIMENTAL opt_global.h
EXT_RESOURCES opt_global.h
DIRECTIO
FILEMON opt_dontuse.h

2
tools/build/options/WITH_EXPERIMENTAL Normal file
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@ -0,0 +1,2 @@
.\" $FreeBSD$
Set to include experimental features in the build.