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 # For each entry FOO/BAR in __DEFAULT_DEPENDENT_OPTIONS,
15 # MK_FOO is set to "no" if WITHOUT_FOO is defined,
16 # "yes" if WITH_FOO is defined, otherwise the value of MK_BAR.
18 # If both WITH_FOO and WITHOUT_FOO are defined, WITHOUT_FOO wins and
19 # MK_FOO is set to "no" regardless of which list it was in.
21 # All of __DEFAULT_YES_OPTIONS, __DEFAULT_NO_OPTIONS and
22 # __DEFAULT_DEPENDENT_OPTIONS are undef'd after all this processing,
23 # allowing this file to be included multiple times with different lists.
25 # Other parts of the build system will set BROKEN_OPTIONS to a list
26 # of options that are broken on this platform. This will not be unset
27 # before returning. Clients are expected to always += this variable.
29 # Users should generally define WITH_FOO or WITHOUT_FOO, but the build
30 # system should use MK_FOO={yes,no} when it needs to override the
31 # user's desires or default behavior.
35 # MK_* options which default to "yes".
37 .for var in ${__DEFAULT_YES_OPTIONS}
38 .if !defined(MK_${var})
39 .if defined(WITHOUT_${var}) # WITHOUT always wins
45 .if ${MK_${var}} != "yes" && ${MK_${var}} != "no"
46 .error "Illegal value for MK_${var}: ${MK_${var}}"
48 .endif # !defined(MK_${var})
50 .undef __DEFAULT_YES_OPTIONS
53 # MK_* options which default to "no".
55 .for var in ${__DEFAULT_NO_OPTIONS}
56 .if !defined(MK_${var})
57 .if defined(WITH_${var}) && !defined(WITHOUT_${var}) # WITHOUT always wins
63 .if ${MK_${var}} != "yes" && ${MK_${var}} != "no"
64 .error "Illegal value for MK_${var}: ${MK_${var}}"
66 .endif # !defined(MK_${var})
68 .undef __DEFAULT_NO_OPTIONS
71 # MK_* options which are always no, usually because they are
72 # unsupported/badly broken on this architecture.
74 .for var in ${BROKEN_OPTIONS}
78 .for vv in ${__DEFAULT_DEPENDENT_OPTIONS}
79 .if defined(WITH_${vv:H}) && defined(WITHOUT_${vv:H})
81 .elif defined(WITH_${vv:H})
83 .elif defined(WITHOUT_${vv:H})
86 MK_${vv:H}?= ${MK_${vv:T}}
88 MK_${vv:H}:= ${MK_${vv:H}}
90 .undef __DEFAULT_DEPENDENT_OPTIONS