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382092a0cd
Fix for 1f0de66ea2a: We need to prevent redeclaration of typedef yyscan_t. (This will work with C11 but not currently with C99.) The generated scanner files provide their own typedef, but we also need to provide one for the interfaces that we expose. So we need to add some preprocessor guards to avoid a redefinition. (This is how the generated scanner files do it internally as well.) This way everything now works independent of the order in which things are included. Discussion: https://www.postgresql.org/message-id/flat/eb6faeac-2a8a-4b69-9189-c33c520e5b7b@eisentraut.org