All macosx builds in CI currently fail. This is caused by in issue with JDK-8201483 which leaves the JVM_VARIANTS_server variable empty. The construct used to subtract one set of strings from another doesn't work quite as expected with bsd grep.

result=`$GREP -Fvx "$legal_values" <<< "$values_to_check" | $GREP -v '^$'`

If the set to subtract ($legal_values) is empty, gnu grep returns all values (as expected) while bsd grep returns nothing. To fix this I've added an explicit check for the base case of legal_values being empty. This seems to make --with-jvm-features work correctly on macosx and still work correctly on Linux. A verification distributed build is under way.




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