Question

When byte-compiling several eLisp files in a batch the output from the compiler is cluttered with Warning: function `position' from cl package called at runtime warnings. I understand, although don’t agree that much with the policy on cl package. But this makes spotting other, more useful warnings more difficult. So, while there’s no real way to avoid the warning, is there a way to selectively shut off all warnings of a certain pattern?

EDIT: (attached an example)

create file called doodles.el

(require 'cl)
(eval-when-compile (require 'cl))

(dotimes (i 1)
  (position ?\x "x"))

M-x byte-compile-file RET doodles.el

Switch to *Compile-Log* buffer:

doodles.el:1:1:Warning: cl package required at runtime

this is what you get.

Answer 1

You can control byte-compiler warnings with a Local variables block that sets the byte-compile-warnings variable. To turn off the CL-at-runtime warning, place this near the end of your module:

;; Local Variables:
;; byte-compile-warnings: (not cl-functions)
;; End: