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 # Other parts of the build system will set BROKEN_OPTIONS to a list
22 # of options that are broken on this platform. This will not be unset
23 # before returning. Clients are expected to always += this variable.
25 # Users should generally define WITH_FOO or WITHOUT_FOO, but the build
26 # system should use MK_FOO={yes,no} when it needs to override the
27 # user's desires or default behavior.
31 # MK_* options which default to "yes".
33 .for var in ${__DEFAULT_YES_OPTIONS}
34 .if !defined(MK_${var})
35 .if defined(WITHOUT_${var}) # WITHOUT always wins
41 .if ${MK_${var}} != "yes" && ${MK_${var}} != "no"
42 .error "Illegal value for MK_${var}: ${MK_${var}}"
44 .endif # !defined(MK_${var})
46 .undef __DEFAULT_YES_OPTIONS
49 # MK_* options which default to "no".
51 .for var in ${__DEFAULT_NO_OPTIONS}
52 .if !defined(MK_${var})
53 .if defined(WITH_${var}) && !defined(WITHOUT_${var}) # WITHOUT always wins
59 .if ${MK_${var}} != "yes" && ${MK_${var}} != "no"
60 .error "Illegal value for MK_${var}: ${MK_${var}}"
62 .endif # !defined(MK_${var})
64 .undef __DEFAULT_NO_OPTIONS
67 # MK_* options which are always no, usually because they are
68 # unsupported/badly broken on this architecture.
70 .for var in ${BROKEN_OPTIONS}
74 .for vv in ${__DEFAULT_DEPENDENT_OPTIONS}
75 .if defined(WITH_${vv:H}) && defined(WITHOUT_${vv:H})
77 .elif defined(WITH_${vv:H})
79 .elif defined(WITHOUT_${vv:H})
82 MK_${vv:H}?= ${MK_${vv:T}}
84 MK_${vv:H}:= ${MK_${vv:H}}
86 .undef __DEFAULT_DEPENDENT_OPTIONS