I'm experimentally rebuilding rawhide with the not-yet-released GCC 15 to see if anything breaks, and to help write the porting guide. See https://fedoraproject.org/wiki/User:Dmalcolm/gcc-15 My test build with GCC 15 failed: https://copr.fedorainfracloud.org/coprs/dmalcolm/gcc-15-smoketest-3.failed/build/8476071/ whereas my test build with GCC 14 succeeded: https://copr.fedorainfracloud.org/coprs/dmalcolm/gcc-15-smoketest-3.failed.checker/build/8477637/ Looking at the failure logs e.g. https://download.copr.fedorainfracloud.org/results/dmalcolm/gcc-15-smoketest-3.failed/fedora-rawhide-x86_64/08476071-alevt/builder-live.log.gz I see: ui.c: In function ‘do_next_pgno’: ui.c:159:57: error: passing argument 5 of ‘w->vbi->cache->op->foreach_pg’ from incompatible pointer type [-Wincompatible-pointer-types] 159 | pgno, subno, dir, subs ? _next_subno:_next_pgno, &arg)) | ~~~~~~~~~~~~~~~~~~^~~~~~~~~~~ | | | int (*)(int *, struct vt_page *) ui.c:159:57: note: expected ‘int (*)(void)’ but argument is of type ‘int (*)(int *, struct vt_page *)’ This is probably due to GCC 15 now defaulting to -std=gnu23, whereas GCC 14 defaulted to -std=gnu17, and C23 is stricter about function prototypes than C17. It's probably fixable by fixing the function prototypes (or by manually adding -std=gnu17 to the C build flags) Reproducible: Always
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