Document logic for __DEFAULT_DEPENDENT_OPTIONS
Reviewed by: stevek Differential Revision: https://reviews.freebsd.org/D21640
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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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# For each entry FOO/BAR in __DEFAULT_DEPENDENT_OPTIONS,
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# MK_FOO is set to "no" if WITHOUT_FOO is defined,
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# "yes" if WITH_FOO is defined, otherwise the value of MK_BAR.
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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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# All of __DEFAULT_YES_OPTIONS, __DEFAULT_NO_OPTIONS and
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# __DEFAULT_DEPENDENT_OPTIONS are undef'd after all this processing,
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# allowing this file to be included multiple times with different lists.
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#
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# Other parts of the build system will set BROKEN_OPTIONS to a list
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# of options that are broken on this platform. This will not be unset
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