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When compiling GCC Rust FE, clang gives the following warning: /home/worker/buildworker/tiber-gcc-clang/build/gcc/rust/ast/rust-fmt.h:403:15: warning: 'collect_pieces' has C-linkage specified, but returns incomplete type 'FFIVec<Piece>' which could be incompatible with C [-Wreturn-type-c-linkage] /home/worker/buildworker/tiber-gcc-clang/build/gcc/rust/ast/rust-fmt.h:406:15: warning: 'clone_pieces' has C-linkage specified, but returns incomplete type 'FFIVec<Piece>' which could be incompatible with C [-Wreturn-type-c-linkage] I have raised this with GCC Rust folk on their Zulip chat and we agreed the warning should be filtered out, at least fornow. It is tracked as https://github.com/Rust-GCC/gccrs/issues/4441 so it is not forgotten but even there it seems that the outcome may be we'd just ignore the warning forever, as far as I can tell. contrib/ChangeLog: 2026-02-24 Martin Jambor <mjambor@suse.cz> * filter-clang-warnings.py (skip_warning): Skip warning -Wreturn-type-c-linkage in rust/ast/rust-fmt.h. Fix indentation of the entry for libiberty/sha1.c.
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