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9fb855fe1a
Before Bison 3.4, the generated parser implementation files run afoul of -Wmissing-variable-declarations (in spite of commit ab61c40bfa2) because declarations for yylval and possibly yylloc are missing. The generated header files contain an extern declaration, but the implementation files don't include the header files. Since Bison 3.4, the generated implementation files automatically include the generated header files, so then it works. To make this work with older Bison versions as well, include the generated header file from the .y file. (With older Bison versions, the generated implementation file contains effectively a copy of the header file pasted in, so including the header file is redundant. But we know this works anyway because the core grammar uses this arrangement already.) Discussion: https://www.postgresql.org/message-id/flat/e0a62134-83da-4ba4-8cdb-ceb0111c95ce@eisentraut.org