61 lines
1.6 KiB
Makefile
61 lines
1.6 KiB
Makefile
#
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# $FreeBSD$
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#
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# Generic mechanism to deal with WITH and WITHOUT options and turn
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# them into MK_ options.
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#
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# For each option FOO in __DEFAULT_YES_OPTIONS, MK_FOO is set to
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# "yes", unless WITHOUT_FOO is defined, in which case it is set to
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# "no".
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#
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# For each option FOO in __DEFAULT_NO_OPTIONS, MK_FOO is set to "no",
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# unless WITH_FOO is defined, in which case it is set to "yes".
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#
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# If both WITH_FOO and WITHOUT_FOO are defined, WITHOUT_FOO wins and
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# MK_FOO is set to "no" regardless of which list it was in.
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#
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# Both __DEFAULT_YES_OPTIONS and __DEFAULT_NO_OPTIONS are undef'd
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# after all this processing, allowing this file to be included
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# multiple times with different lists.
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#
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# Users should generally define WITH_FOO or WITHOUT_FOO, but the build
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# system should use MK_FOO={yes,no} when it needs to override the
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# user's desires or default behavior.
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#
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#
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# MK_* options which default to "yes".
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#
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.for var in ${__DEFAULT_YES_OPTIONS}
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.if !defined(MK_${var})
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.if defined(WITHOUT_${var}) # WITHOUT always wins
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MK_${var}:= no
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.else
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MK_${var}:= yes
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.endif
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.else
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.if ${MK_${var}} != "yes" && ${MK_${var}} != "no"
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.error "Illegal value for MK_${var}: ${MK_${var}}"
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.endif
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.endif # !defined(MK_${var})
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.endfor
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.undef __DEFAULT_YES_OPTIONS
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#
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# MK_* options which default to "no".
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#
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.for var in ${__DEFAULT_NO_OPTIONS}
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.if !defined(MK_${var})
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.if defined(WITH_${var}) && !defined(WITHOUT_${var}) # WITHOUT always wins
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MK_${var}:= yes
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.else
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MK_${var}:= no
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.endif
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.else
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.if ${MK_${var}} != "yes" && ${MK_${var}} != "no"
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.error "Illegal value for MK_${var}: ${MK_${var}}"
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.endif
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.endif # !defined(MK_${var})
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.endfor
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.undef __DEFAULT_NO_OPTIONS
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