[Bug 212667] [PATCH] machdep.c: check DDB_ENABLED before defining SPR/db_show_table

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=212667

            Bug ID: 212667
           Summary: [PATCH] machdep.c: check DDB_ENABLED before defining
                    SPR/db_show_table
           Product: Base System
           Version: CURRENT
          Hardware: powerpc
                OS: Any
            Status: New
          Keywords: patch
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: kennethsalerno at yahoo.com
          Keywords: patch

Created attachment 174741
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=174741&action=edit
patch to check if ddb is enabled in kernel before defining debugger commands

In reference to this change last month:
r304051 | jhibbits | 2016-08-13 14:46:49 -0400 (Sat, 13 Aug 2016) | 21 lines

Add a kdb show command to print arbitrary SPRs on PowerPC
-----------------------------------------------------------------------------

The attached patch checks first if DDB is enabled in the kernel configuration
before defining db_show_table (DB_SHOW_COMMAND(spr, db_show_spr)). 

The behavior before this patch is a powerpc/powerpc64 kernel with DDB disabled
fails to link with an undefined reference to db_show_table.

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