Build all Flex files standalone

The proposed Meson build system will need a way to ignore certain
generated files in order to coexist with the autoconf build system,
and C files generated by Flex which are #include'd into .y files make
this more difficult. In similar vein to 72b1e3a21, arrange for all Flex
C files to compile to their own .o targets.

Reviewed by Andres Freund

Discussion: https://www.postgresql.org/message-id/20220810171935.7k5zgnjwqzalzmtm%40awork3.anarazel.de
Discussion: https://www.postgresql.org/message-id/CAFBsxsF8Gc2StS3haXofshHCzqNMRXiSxvQEYGwnFsTmsdwNeg@mail.gmail.com

1 files changed, 32 insertions, 0 deletions

diff --git a/src/backend/utils/adt/jsonpath_internal.h b/src/backend/utils/adt/jsonpath_internal.h
new file mode 100644
index 00000000000..edfc6191a0e
--- /dev/null
+++ b/src/backend/utils/adt/jsonpath_internal.h
@@ -0,0 +1,32 @@
+/*-------------------------------------------------------------------------
+ *
+ * jsonpath_internal.h
+ *     Private definitions for jsonpath scanner & parser
+ *
+ * Portions Copyright (c) 1996-2022, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/backend/utils/adt/jsonpath_internal.h
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#ifndef JSONPATH_INTERNAL_H
+#define JSONPATH_INTERNAL_H
+
+/* struct JsonPathString is shared between scan and gram */
+typedef struct JsonPathString
+{
+	char	   *val;
+	int			len;
+	int			total;
+}			JsonPathString;
+
+#include "utils/jsonpath.h"
+#include "jsonpath_gram.h"
+
+extern int     jsonpath_yylex(YYSTYPE *yylval_param);
+extern int     jsonpath_yyparse(JsonPathParseResult **result);
+extern void jsonpath_yyerror(JsonPathParseResult **result, const char *message);
+
+#endif							/* JSONPATH_INTERNAL_H */