Brooks Davis
ce5fa47cf0
Support group options where 1 of n values will be selected (or a default
value will be used). After processing, an OPT_FOO will be set to one
value from __FOO_OPTIONS for each FOO in __SINGLE_OPTIONS. If the user
sets FOO that value will be used, otherwise __FOO_DEFAULT will be used.
Options that don't work an a particular system can be remapped to an
alternative using BROKEN_SINGLE_OPTIONS which can be set to a list of
3-tuples of the form:
OPTION broken_value replacement_value
This is somewhat inspired by OPTIONS_SINGLE from ports, but the
structure is quite different with a per-option variable in the style of
MK_FOO={yes,no}.
Reviewed by: imp, emaste
Differential Revision: https://reviews.freebsd.org/D41659
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