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diff --git a/share/mk/bsd.mkopt.mk b/share/mk/bsd.mkopt.mk
--- a/share/mk/bsd.mkopt.mk
+++ b/share/mk/bsd.mkopt.mk
@@ -1,7 +1,7 @@
#
#
# Generic mechanism to deal with WITH and WITHOUT options and turn
-# them into MK_ options.
+# them into MK_ options. Also turn group options into OPT_ options.
#
# For each option FOO in __DEFAULT_YES_OPTIONS, MK_FOO is set to
# "yes", unless WITHOUT_FOO is defined, in which case it is set to
@@ -31,6 +31,15 @@
# system should use MK_FOO={yes,no} when it needs to override the
# user's desires or default behavior.
#
+# For each option in __SINGLE_OPTIONS, OPT_FOO is set to FOO if
+# defined and __FOO_DEFAULT if not. Valid values for FOO are specified
+# by __FOO_OPTIONS.
+#
+# Other parts of the build system will set BROKEN_SINGLE_OPTIONS to a
+# list of 3-tuples of the form: "OPTION broken_value replacment_value".
+# This will not be unset before returning. Clients are expected to
+# always += this variable.
+#
#
# MK_* options which default to "yes".
@@ -93,6 +102,33 @@
MK_${var}:= no
.endfor
+#
+# Group options set an OPT_FOO variable for each option.
+#
+.for opt in ${__SINGLE_OPTIONS}
+.if !defined(__${opt}_OPTIONS) || empty(__${opt}_OPTIONS)
+.error __${opt}_OPTIONS undefined or empty
+.endif
+.if !defined(__${opt}_DEFAULT) || empty(__${opt}_DEFAULT)
+.error __${opt}_DEFAULT undefined or empty
+.endif
+.if defined(${opt})
+OPT_${opt}:= ${${opt}}
+.else
+OPT_${opt}:= ${__${opt}_DEFAULT}
+.endif
+.if empty(OPT_${opt}) || ${__${opt}_OPTIONS:M${OPT_${opt}}} != ${OPT_${opt}}
+.error Invalid option OPT_${opt} (${OPT_${opt}}), must be one of: ${__${opt}_OPTIONS}
+.endif
+.endfor
+.undef __SINGLE_OPTIONS
+
+.for opt val rep in ${BROKEN_SINGLE_OPTIONS}
+.if ${OPT_${opt}} == ${val}
+OPT_${opt}:= ${rep}
+.endif
+.endfor
+
.for vv in ${__DEFAULT_DEPENDENT_OPTIONS}
.if defined(WITH_${vv:H}) && defined(WITHOUT_${vv:H})
MK_${vv:H}?= no
diff --git a/sys/conf/kern.opts.mk b/sys/conf/kern.opts.mk
--- a/sys/conf/kern.opts.mk
+++ b/sys/conf/kern.opts.mk
@@ -141,6 +141,33 @@
MK_${var}:= no
.endfor
.undef BROKEN_OPTIONS
+
+#
+# Group options set an OPT_FOO variable for each option.
+#
+.for opt in ${__SINGLE_OPTIONS}
+.if !defined(__${opt}_OPTIONS) || empty(__${opt}_OPTIONS)
+.error __${opt}_OPTIONS not defined or empty
+.endif
+.if !defined(__${opt}_DEFAULT) || empty(__${opt}_DEFAULT)
+.error __${opt}_DEFAULT undefined or empty
+.endif
+.if defined(${opt})
+OPT_${opt}:= ${${opt}}
+.else
+OPT_${opt}:= ${__${opt}_DEFAULT}
+.endif
+.if empty(OPT_${opt}) || ${__${opt}_OPTIONS:M${OPT_${opt}}} != ${OPT_${opt}}
+.error Invalid option OPT_${opt} (${OPT_${opt}}), must be one of: ${__${opt}_OPTIONS}
+.endif
+.endfor
+.undef __SINGLE_OPTIONS
+
+.for opt val rep in ${BROKEN_SINGLE_OPTIONS}
+.if ${OPT_${opt}} == ${val}
+OPT_${opt}:= ${rep}
+.endif
+.endfor
#end of bsd.mkopt.mk expanded inline.
#

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