I'm experimentally rebuilding rawhide with the not-yet-released GCC 15 to see if anything breaks, and to help write the porting guide.

In https://download.copr.fedorainfracloud.org/results/dmalcolm/gcc-15-smoketest/fedora-rawhide-aarch64/08368364-epson-inkjet-printer-escpr/builder-live.log.gz

I see this build failure:

filter.c: In function ‘main’:
filter.c:380:15: error: too many arguments to function ‘SendStartJob’
  380 |         err = SendStartJob(FALSE);
      |               ^~~~~~~~~~~~
filter.c:49:21: note: declared here
   49 | extern EPS_ERR_CODE SendStartJob ();
      |                     ^~~~~~~~~~~~

GCC 15 defaults to C23, in which I believe the () in a decl now means "void" rather than implicit "int"; see:
https://fedoraproject.org/wiki/User:Dmalcolm/gcc-15#Function_prototypes_with_empty_params_change_from_implicit_%22int%22_to_%22void%22

Hence this looks like an issue with the prototype in filter.c

Reproducible: Always




I didn't check to see if this is fixed upstream yet.