xref: /freebsd/share/mk/bsd.mkopt.mk (revision 4ce386ff25d77954b8cfa11534f632172e848244)
1#
2# $FreeBSD$
3#
4# Generic mechanism to deal with WITH and WITHOUT options and turn
5# them into MK_ options.
6#
7# For each option FOO in __DEFAULT_YES_OPTIONS, MK_FOO is set to
8# "yes", unless WITHOUT_FOO is defined, in which case it is set to
9# "no".
10#
11# For each option FOO in __DEFAULT_NO_OPTIONS, MK_FOO is set to "no",
12# unless WITH_FOO is defined, in which case it is set to "yes".
13#
14# If both WITH_FOO and WITHOUT_FOO are defined, WITHOUT_FOO wins and
15# MK_FOO is set to "no" regardless of which list it was in.
16#
17# Both __DEFAULT_YES_OPTIONS and __DEFAULT_NO_OPTIONS are undef'd
18# after all this processing, allowing this file to be included
19# multiple times with different lists.
20#
21# Users should generally define WITH_FOO or WITHOUT_FOO, but the build
22# system should use MK_FOO={yes,no} when it needs to override the
23# user's desires or default behavior.
24#
25
26#
27# MK_* options which default to "yes".
28#
29.for var in ${__DEFAULT_YES_OPTIONS}
30.if !defined(MK_${var})
31.if defined(WITHOUT_${var})			# WITHOUT always wins
32MK_${var}:=	no
33.else
34MK_${var}:=	yes
35.endif
36.else
37.if ${MK_${var}} != "yes" && ${MK_${var}} != "no"
38.error "Illegal value for MK_${var}: ${MK_${var}}"
39.endif
40.endif # !defined(MK_${var})
41.endfor
42.undef __DEFAULT_YES_OPTIONS
43
44#
45# MK_* options which default to "no".
46#
47.for var in ${__DEFAULT_NO_OPTIONS}
48.if !defined(MK_${var})
49.if defined(WITH_${var}) && !defined(WITHOUT_${var}) # WITHOUT always wins
50MK_${var}:=	yes
51.else
52MK_${var}:=	no
53.endif
54.else
55.if ${MK_${var}} != "yes" && ${MK_${var}} != "no"
56.error "Illegal value for MK_${var}: ${MK_${var}}"
57.endif
58.endif # !defined(MK_${var})
59.endfor
60.undef __DEFAULT_NO_OPTIONS
61