[OE-core] in meta-yocto-bsp kernel recipes, why individual settings for COMPATIBLE_MACHINE?

[Robert P. J. Day]

  more nitpicky pedantry ... under
meta-yocto-bsp/recipes-kernel/linux, i see a number of
COMPATIBLE_MACHINE settings:

  COMPATIBLE_MACHINE_genericx86 = "genericx86"
  COMPATIBLE_MACHINE_genericx86-64 = "genericx86-64"
  COMPATIBLE_MACHINE_edgerouter = "edgerouter"
  COMPATIBLE_MACHINE_beaglebone = "beaglebone"
  COMPATIBLE_MACHINE_mpc8315e-rdb = "mpc8315e-rdb"

given that every one of those conditional assignments match *exactly*
the respective target system, how does that effectively differ from
just writing (issues with RE matching aside):

  COMPATIBLE_MACHINE = "(genericx86|genericx86-64|edgerouter|beaglebone|mpc8315e-rdb)"

i can certainly see how one might need to use conditional assignments
for COMPATIBLE_MACHINE if one has, say, extended the definition of
MACHINEOVERRIDES to classify target systems into compatible subgroups,
but that's not what's happening above. is there something more subtle
going on there that i'm missing?

rday

-- 

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Robert P. J. Day                                 Ottawa, Ontario, CANADA
                        http://crashcourse.ca

Twitter:                                       http://twitter.com/rpjday
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