[Bug 191930] New: Bring kernel debug files into line with userland standalone debug

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=191930

            Bug ID: 191930
           Summary: Bring kernel debug files into line with userland
                    standalone debug
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: Any
                OS: Any
            Status: Needs Triage
          Severity: Affects Only Me
          Priority: ---
         Component: misc
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: emaste at freebsd.org

A single src.conf(5) knob, WITH_DEBUG_FILES=yes, enables userland standalone
debug.  Setting it enables a few things:

- CFLAGS has -g added to generate debug data during compilation
- Binaries and libraries are built as a .full version which includes debug
- The .full file is converted into one with the debug data stripped out (no
extra extension), and a separate debug data file (.debug extension)
- Debug data is installed under /usr/lib/debug/...

Kernel standalone debug files have a few differences:

- The -g flag has to be added via the kernel config file (it is set in GENERIC)
- WITHOUT_KERNEL_SYMBOLS will avoid splitting the kernel objects
- Extensions are different (.debug for the full object, .symbols for the debug
data)
- Debug data is installed in the same directory as the kernel objects, in
/boot/kernel

The last point is an annoyance, as /boot may not be a very large filesystem

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