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This warning flag detects global variables not declared in header files. This is similar to what -Wmissing-prototypes does for functions. (More correctly, it is similar to what -Wmissing-declarations does for functions, but -Wmissing-prototypes is a superset of that in C.) This flag is new in GCC 14. Clang has supported it for a while. Several recent commits have cleaned up warnings triggered by this, so it should now be clean. Reviewed-by: Andres Freund <andres@anarazel.de> Discussion: https://www.postgresql.org/message-id/flat/e0a62134-83da-4ba4-8cdb-ceb0111c95ce@eisentraut.org