[Bug 279530] Improved Build Option/src.conf Dependency Support

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=279530

            Bug ID: 279530
           Summary: Improved Build Option/src.conf Dependency Support
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: bugs@FreeBSD.org
          Reporter: editor@callfortesting.org

It is above my pay grade to say if this is a bug or feature request.

FreeBSD build options have a limited notion of dependency warning, notably if
you enter a src-env.conf entry in src.conf, you quickly receive the
notification:

make: "/usr/src/share/mk/src.sys.mk" line 27: Option <BUILD OPTION> may only be
defined in /etc/src-env.conf, environment, or make argument, not
<path>/src.conf.

This is an appreciated time saver.

Options such as WITHOUT_SYSTEM_LINKER include dependency information in
src.conf(5) such as, "This option is only relevant when WITH_LLD_BOOTSTRAP is
set.". However, it fails without a warning, and the src.conf(5) entry for
WITH_LLD_BOOTSTRAP reports, "To be able to build the system an alternate linker
must be provided via XLD.".

Having those as machine-mandated rather than manual-mandated dependencies would
be very helpful and time saving when validating the build options. It would be
nice if attempting to build with one minus the other would simply give the
information in the manual page and exit, rather than continue for minutes or
hours, and return an error, which can be particularly confusing when built in
parallel.

Related, example syntax of "an alternative linker" would make the information
more actionable.

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