The main reason that I included an #error directive is to catch the case where LU_NV_BITS has not been set at all.

Also, I simply copied your probe logic, but I must ask if you are sure that that is the right way to do it. Reading a value from %Config for one test, evaluating an expression for another, and then just using a default seems strange to me. Are you sure $Config{nvsize} will not give you 10 and 16 for the 80 and 128 bit cases?

In reply to Re^6: Defining an XS symbol in the Makefile.PL by jcb
in thread Defining an XS symbol in the Makefile.PL by syphilis

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