gccrs: rust: Explicitly instantiate FFIVec<Piece> for C-linkage

gcc/rust/ChangeLog:

	* ast/rust-fmt.h: Explicitly instantiate FFIVec<Piece>.

Signed-off-by: Hritam Shrivastava <hritamstark05@gmail.com>

diff --git a/gcc/rust/ast/rust-fmt.h b/gcc/rust/ast/rust-fmt.h
index 4577665dc93b70ec67baceec70b0afad515f7921..a7741981f5396143fbaea408a1e9e683a4d7c9ba 100644 (file)
--- a/gcc/rust/ast/rust-fmt.h
+++ b/gcc/rust/ast/rust-fmt.h
@@ -398,6 +398,10 @@ enum ParseMode
   InlineAsm,
 };
 
+// Required to avoid Clang warning about returning an incomplete FFIVec<Piece>
+// from extern "C" functions.
+template class FFIVec<Piece>;
+
 extern "C" {
 
 FFIVec<Piece> collect_pieces (RustHamster input, bool append_newline,