>        /* ### should there be a leading underscore for some platforms? */
>-       sprintf(funcname, "init%.200s", shortname);
>+#ifndef __ELF__
>+       sprintf(funcname, "_init%.200s", shortname);
>+#else
>+        sprintf(funcname, "init%.200s", shortname);
>+#endif

you'd probably be better off with something like

       sprintf(funcname, "%s.200s", ___STRING(_C_LABEL(init)), shortname);

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