accessing PIKE_MODULE_INIT{} in a CMOD?

I have a couple modules that are just plain CMODs, with no pike stub at all. Is there a way to put a couple of add_string_constant() calls into the PIKE_MODULE_INIT{} section that is generated from a CMOD? I tried just making an INIT{} section in the module outside of the classes, but that didn't work.

Which version of Pike?

From a somewhat recent precompile.pike:

* AUTOMATIC ALLOCATION AND DEALLOCATION OF CONSTANT STRINGS * You can use the syntax MK_STRING("my string") to refer to * a struct pike_string with the content "my string", or the * syntax MK_STRING_SVALUE("my string") for the same, but a * full svalue. Note that this syntax can not be used in macros.