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 __REQUIRED_OPTIONS, MK_FOO is set to "yes".
13 # For each option FOO in __DEFAULT_NO_OPTIONS, MK_FOO is set to "no",
14 # unless WITH_FOO is defined, in which case it is set to "yes".
16 # For each entry FOO/BAR in __DEFAULT_DEPENDENT_OPTIONS,
17 # MK_FOO is set to "no" if WITHOUT_FOO is defined,
18 # "yes" if WITH_FOO is defined, otherwise the value of MK_BAR.
20 # If both WITH_FOO and WITHOUT_FOO are defined, WITHOUT_FOO wins and
21 # MK_FOO is set to "no" regardless of which list it was in.
23 # All of __DEFAULT_YES_OPTIONS, __DEFAULT_NO_OPTIONS and
24 # __DEFAULT_DEPENDENT_OPTIONS are undef'd after all this processing,
25 # allowing this file to be included multiple times with different lists.
27 # Other parts of the build system will set BROKEN_OPTIONS to a list
28 # of options that are broken on this platform. This will not be unset
29 # before returning. Clients are expected to always += this variable.
31 # Users should generally define WITH_FOO or WITHOUT_FOO, but the build
32 # system should use MK_FOO={yes,no} when it needs to override the
33 # user's desires or default behavior.
37 # MK_* options which default to "yes".
39 .for var in ${__DEFAULT_YES_OPTIONS}
40 .if !defined(MK_${var})
41 .if defined(WITH_${var}) && ${WITH_${var}} == "no"
42 .warning Use WITHOUT_${var}=1 instead of WITH_${var}=no
44 .if defined(WITHOUT_${var}) # WITHOUT always wins
50 .if ${MK_${var}} != "yes" && ${MK_${var}} != "no"
51 .error Illegal value for MK_${var}: ${MK_${var}}
53 .endif # !defined(MK_${var})
55 .undef __DEFAULT_YES_OPTIONS
58 # MK_* options which are always yes, typically as a transitional
59 # step towards removing the options entirely.
61 .for var in ${__REQUIRED_OPTIONS}
66 # MK_* options which default to "no".
68 .for var in ${__DEFAULT_NO_OPTIONS}
69 .if !defined(MK_${var})
70 .if defined(WITH_${var}) && ${WITH_${var}} == "no"
71 .warning Use WITHOUT_${var}=1 instead of WITH_${var}=no
73 .if defined(WITH_${var}) && !defined(WITHOUT_${var}) # WITHOUT always wins
79 .if ${MK_${var}} != "yes" && ${MK_${var}} != "no"
80 .error Illegal value for MK_${var}: ${MK_${var}}
82 .endif # !defined(MK_${var})
84 .undef __DEFAULT_NO_OPTIONS
87 # MK_* options which are always no, usually because they are
88 # unsupported/badly broken on this architecture.
90 .for var in ${BROKEN_OPTIONS}
94 .for vv in ${__DEFAULT_DEPENDENT_OPTIONS}
95 .if defined(WITH_${vv:H}) && defined(WITHOUT_${vv:H})
97 .elif defined(WITH_${vv:H})
99 .elif defined(WITHOUT_${vv:H})
102 MK_${vv:H}?= ${MK_${vv:T}}
104 MK_${vv:H}:= ${MK_${vv:H}}
106 .undef __DEFAULT_DEPENDENT_OPTIONS