Mk/bsd.options.mk: Introduce SELECTED_OPTIONS, DESELECTED_OPTIONS

Until now, the only way to obtain information on the valid port options
and the current selection states is by using the pretty-print-config
target.  It would look something like this:

  > make -C /usr/ports/lang/gcc5-aux print-print-config
  Standard[ +FORT +OBJC +NLS -TESTSUITE -ALLSTAGES -STATIC ] \
  Bootstrap[ -BOOTSTRAP ]

To process the total options and the selection state of each option
requires additional processing, e.g. with awk and/or sed.  Moreover, if
other information is needed about the port it question, it would require
a second execution of "make" to reveal variable values. There simply is
no other way to obtain the option selection information in a single pass
(this limitation came when options framework was brought in).

This enhancement allows the option selection information to revealed with
make -V so that all port information can be acquired in a single pass.
Moreover, they won't require piping through sed or awk.  Two read-only
variables are introduced:

  SELECTED_OPTIONS   (list of all "on" options)
  DESELECTED_OPTIONS (liss of all "off" options)

Here's an example of a single pass acquisition:

  > make -C /usr/dports/lang/gcc5-aux -V PKGNAME -V SELECTED_OPTIONS \
    -V DESELECTED_OPTIONS
  gcc5-aux-20150716
  NLS OBJC FORT
  BOOTSTRAP STATIC ALLSTAGES TESTSUITE

Obviously the grouping information seen in pretty-print-config is lost,
so these new variables will not help if option group information is
required.

Approved by:	portmgr (bapt)

1 files changed, 28 insertions, 0 deletions

diff --git a/Mk/bsd.options.mk b/Mk/bsd.options.mk
index f399660412af..f4581ae13710 100644
--- a/Mk/bsd.options.mk
+++ b/Mk/bsd.options.mk
@@ -68,6 +68,13 @@
 # WITHOUT			- Unset options from the command line
 #
 #
+# These variables are strictly informational (read-only).  They indicate the
+# current state of the selected options; they are space-delimited lists.
+#
+# SELECTED_OPTIONS		- list of options set "on"
+# DESELECTED_OPTIONS		- list of options set "off"
+#
+#
 # The following knobs are there to simplify the handling of OPTIONS in simple
 # cases :
 #
@@ -573,4 +580,25 @@ _OPTIONS_${_target}:=	${_OPTIONS_${_target}} ${_prio}:${_type}-${_target}-${opt}
 .  endif
 .endfor
 
+.undef (SELECTED_OPTIONS)
+.undef (DESELECTED_OPTIONS)
+.for opt in ${ALL_OPTIONS}
+.  if ${PORT_OPTIONS:M${opt}}
+SELECTED_OPTIONS:=	${opt} ${SELECTED_OPTIONS}
+.  else
+DESELECTED_OPTIONS:=	${opt} ${DESELECTED_OPTIONS}
+.  endif
+.endfor
+.for otype in MULTI GROUP SINGLE RADIO
+.  for m in ${OPTIONS_${otype}}
+.    for opt in ${OPTIONS_${otype}_${m}}
+.      if ${PORT_OPTIONS:M${opt}}
+SELECTED_OPTIONS:=	${opt} ${SELECTED_OPTIONS}
+.      else
+DESELECTED_OPTIONS:=	${opt} ${DESELECTED_OPTIONS}
+.      endif
+.    endfor
+.  endfor
+.endfor
+
 .endif