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When --enable-fuzz-options is given, those --enable or --with options
that are separately so marked, and have not been specified explicitly
at the configure command line (i.e. typically from autogen.input), are
randomly set to either yes or no.
This functionality is useful to make sure configure options don't
bit-rot by randomly exercising uncommon settings and combinations.
To enable fuzzing for an option, use libo_FUZZ_ARG_WITH instead of
AC_ARG_WITH, or libo_FUZZ_ARG_ENABLE instead of AC_ARG_ENABLE.
Also handle two cases of incompatibilty of options discovered by using
--enable-fuzz-options. In general using incompatible options should
cause an AC_MSG_ERROR(), but when one of the options in question has
been set by fuzzing, it's simplest to just reset it to the compatible
value.
Obviously this is highly experimental.
Change-Id: I76d250c148892951a7fda25ba4164de8bc693a26
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