Remove $FreeBSD$: one-line nroff pattern

Remove /^\.\\"\s*\$FreeBSD\$$\n/

Clarify some option descriptions, add a line of text to makeman to
add the slightest hint of a shade of a clue of what it does.

Sponsored by: iXsystems

SYSTEM_COMPILER is not forced off with META_MODE after r304682.

Sponsored by: Dell EMC Isilon

WITH_META_MODE: Enable printing of some of make's environment on error.

This will print a set of variables from make on error using
MAKE_PRINT_VAR_ON_ERROR. It is already enabled for the DIRDEPS_BU

WITH_META_MODE: Enable printing of some of make's environment on error.

This will print a set of variables from make on error using
MAKE_PRINT_VAR_ON_ERROR. It is already enabled for the DIRDEPS_BUILD.
It may make sense to enable this in the non-meta mode as well once
people are more used to its more verbose error output.

This makes it much simpler to see which .meta file is used when a
command files so that it may be inspected for the build command.

Suggested by: sjg
Approved by: re (implicit)
Sponsored by: EMC / Isilon Storage Division

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WITH_META_MODE: Lessen the filemon(4) requirement scope.

- Move the sys.mk filemon requirement to bsd.init.mk as a warning.
This is intended only to show when building directly in a subdirectory

WITH_META_MODE: Lessen the filemon(4) requirement scope.

- Move the sys.mk filemon requirement to bsd.init.mk as a warning.
This is intended only to show when building directly in a subdirectory
without filemon loaded.
- Move the error into Makefile and only apply it when building
from the META_TGT_WHITELIST target list.

-DNO_FILEMON can be used to suppress both the warning and the error but
makes WITH_META_MODE less useful. It will only compare build commands
in this mode rather than track all dependencies.

This fixes installing from a jail which doesn't need filemon in this
phase [1].

Reported by: Nikolai Lifanov <[email protected]> [1]
Approved by: re (implicit)
Sponsored by: EMC / Isilon Storage Division

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Document WITH_META_MODE enforcing WITHOUT_SYSTEM_COMPILER.

makeman doesn't handle this since it would need to enable all
non-default options when checking enabling 1 option, which
then convolutes wh

Document WITH_META_MODE enforcing WITHOUT_SYSTEM_COMPILER.

makeman doesn't handle this since it would need to enable all
non-default options when checking enabling 1 option, which
then convolutes what is really affecting each other.

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WITH_META_MODE: Enable bmake's missing meta rebuild feature

WITH_META_MODE: Correct description of missing .meta file.

Sponsored by: EMC / Isilon Storage Division

Add more content for WITH_META_MODE/WITH_DIRDEPS_BUILD.

Sponsored by: EMC / Isilon Storage Division

Add some more content for WITH_META_MODE.

Sponsored by: EMC / Isilon Storage Division

Rename META_MODE option to DIRDEPS_BUILD

This allows META_FILES option to be renamed META_MODE.
Also add META_COOKIE_TOUCH for use in targets that can benefit
from a cookie when in meta mode.

Diffe

Rename META_MODE option to DIRDEPS_BUILD

This allows META_FILES option to be renamed META_MODE.
Also add META_COOKIE_TOUCH for use in targets that can benefit
from a cookie when in meta mode.

Differential Revision: https://reviews.freebsd.org/D4153
Reviewed by: bdrewery

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Document NO_DIRDEPS for META_MODE and give link to full details.

src.conf.5: Make it self-documenting that the mkopts are environment-only.

Sponsored by: EMC / Isilon Storage Division

Document src-env.conf and note its use for MAKEOBJDIRPREFIX and WITH_META_MDOE.

Sponsored by: EMC / Isilon Storage Division

Document NO_SILENT for META_MODE.

Reword and add some formatting as well.

Fix generation of src.conf.5

Since makeman turns all options on, we need to guard somethings from
make(showconfig)