A Super Search yielded the somewhat related Modules in CPAN that don't need to be compiled, but it does not give any more helpful advice than syphilis'.

http://search.cpan.org uses DLSIP notation. The "L" indicates whether compile is needed. However, it requires CPAN authors to "Register" a newly uploaded module, which is voluntary, and in my experience, unreliable. IIRC, the DSLIP designation is manually entered by the author, which means it is subject to typos.

In reply to Re: How to know if a CPAN module uses XS by toolic
in thread How to know if a CPAN module uses XS by bcarroll

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