4 # Generic mechanism to deal with WITH and WITHOUT options and turn
5 # them into MK_ options.
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
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".
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.
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.
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.
27 # MK_* options which default to "yes".
29 .for var in ${__DEFAULT_YES_OPTIONS}
30 .if !defined(MK_${var})
31 .if defined(WITHOUT_${var}) # WITHOUT always wins
37 .if ${MK_${var}} != "yes" && ${MK_${var}} != "no"
38 .error "Illegal value for MK_${var}: ${MK_${var}}"
40 .endif # !defined(MK_${var})
42 .undef __DEFAULT_YES_OPTIONS
45 # MK_* options which default to "no".
47 .for var in ${__DEFAULT_NO_OPTIONS}
48 .if !defined(MK_${var})
49 .if defined(WITH_${var}) && !defined(WITHOUT_${var}) # WITHOUT always wins
55 .if ${MK_${var}} != "yes" && ${MK_${var}} != "no"
56 .error "Illegal value for MK_${var}: ${MK_${var}}"
58 .endif # !defined(MK_${var})
60 .undef __DEFAULT_NO_OPTIONS