DBZ-445 Made postGIS support optional.

Makefile

@@ -4,8 +4,13 @@ EXTENSION = decoderbufs
 PROTOBUF_C_CFLAGS = $(shell pkg-config --cflags 'libprotobuf-c >= 1.0.0')
 PROTOBUF_C_LDFLAGS = $(shell pkg-config --libs 'libprotobuf-c >= 1.0.0')
 
-PG_CPPFLAGS += -std=c11 $(PROTOBUF_C_CFLAGS) -I/usr/local/include
-SHLIB_LINK  += $(PROTOBUF_C_LDFLAGS) -L/usr/local/lib -llwgeom
+ifneq ($(USE_POSTGIS),false)
+C_PARAMS = -DUSE_POSTGIS
+POSTGIS_C_LDFLAGS = -L/usr/local/lib -llwgeom
+endif
+
+PG_CPPFLAGS += -std=c11 $(PROTOBUF_C_CFLAGS) -I/usr/local/include $(C_PARAMS)
+SHLIB_LINK  += $(PROTOBUF_C_LDFLAGS) $(POSTGIS_C_LDFLAGS)
 
 OBJS = src/decoderbufs.o src/proto/pg_logicaldec.pb-c.o
 

src/decoderbufs.c

@@ -60,9 +60,11 @@
 #error Expecting timestamps to be represented as integers, not as floating-point.
 #endif
 
+#ifdef USE_POSTGIS
 /* POSTGIS version define so it doesn't redef macros */
 #define POSTGIS_PGSQL_VERSION 94
 #include "liblwgeom.h"
+#endif
 
 PG_MODULE_MAGIC;
 
@@ -170,6 +172,7 @@ static void pg_decode_shutdown(LogicalDecodingContext *ctx) {
 /* BEGIN callback */
 static void pg_decode_begin_txn(LogicalDecodingContext *ctx,
                                 ReorderBufferTXN *txn) {
+#ifdef USE_POSTGIS
   // set PostGIS geometry type id (these are dynamic)
   // TODO: Figure out how to make sure we get the typid's from postgis extension namespace
   if (geometry_oid == InvalidOid) {
@@ -184,6 +187,7 @@ static void pg_decode_begin_txn(LogicalDecodingContext *ctx,
       elog(DEBUG1, "PostGIS geometry type detected: %u", geography_oid);
     }
   }
+#endif
 }
 
 /* COMMIT callback */
@@ -366,6 +370,7 @@ static double numeric_to_double_no_overflow(Numeric num) {
 
 static bool geography_point_as_decoderbufs_point(Datum datum,
                                                  Decoderbufs__Point *p) {
+#ifdef USE_POSTGIS
   GSERIALIZED *geom;
   LWGEOM *lwgeom;
   LWPOINT *point = NULL;
@@ -393,6 +398,10 @@ static bool geography_point_as_decoderbufs_point(Datum datum,
   }
 
   return true;
+#else
+  elog(DEBUG1, "PostGIS support is off, recompile decoderbufs with USE_POSTGIS option!");
+  return false;
+#endif
 }
 
 /* set a datum value based on its OID specified by typid */