..so the compiler sees printf("***%s***\n", "%.17e");, strips the quotes off of the string constant like any other ...

Oh yes, of course. Silly me.
Thanks !

Cheers,
Rob

In reply to Re^8: Defining an XS symbol in the Makefile.PL (quoting) by syphilis
in thread Defining an XS symbol in the Makefile.PL by syphilis

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