Allow setting codegen guc to ON only if code generation is supported by the build

src/backend/executor/execProcnode.c

@@ -1852,12 +1852,14 @@ ExecEndNode(PlanState *node)
 			break;
 	}
 
-	/*
-	 * if codegen guc is true, then assert if CodegenManager is NULL
-	 */
-	AssertImply(codegen, NULL != node->CodegenManager);
-	CodeGeneratorManagerDestroy(node->CodegenManager);
-	node->CodegenManager = NULL;
+	if (codegen) {
+		/*
+		 * if codegen guc is true, then assert if CodegenManager is NULL
+		 */
+		Assert(NULL != node->CodegenManager);
+		CodeGeneratorManagerDestroy(node->CodegenManager);
+		node->CodegenManager = NULL;
+	}
 
 	estate->currentSliceIdInPlan = origSliceIdInPlan;
 	estate->currentExecutingSliceId = origExecutingSliceId;

src/backend/utils/misc/guc_gp.c

@@ -85,6 +85,7 @@ static const char *assign_optimizer_log_failure(const char *newval,
 static const char *assign_optimizer_minidump(const char *newval,
 						  bool doit, GucSource source);
 static bool assign_optimizer(bool newval, bool doit, GucSource source);
+static bool assign_codegen(bool newval, bool doit, GucSource source);
 static const char *assign_optimizer_cost_model(const char *newval,
 							bool doit, GucSource source);
 static const char *assign_gp_workfile_caching_loglevel(const char *newval,
@@ -3362,7 +3363,7 @@ struct config_bool ConfigureNamesBool_gp[] =
 #else
 		false,
 #endif
-		NULL, NULL
+		assign_codegen, NULL
 	},
 
 	{
@@ -3372,7 +3373,7 @@ struct config_bool ConfigureNamesBool_gp[] =
 			GUC_NO_SHOW_ALL | GUC_NOT_IN_SAMPLE | GUC_GPDB_ADDOPT
 		},
 		&codegen,
-		false, NULL, NULL
+		false, assign_codegen, NULL
 	},
 
 	{
@@ -3382,12 +3383,12 @@ struct config_bool ConfigureNamesBool_gp[] =
 			GUC_NO_SHOW_ALL | GUC_NOT_IN_SAMPLE
 		},
 		&codegen_validate_functions,
-#ifdef USE_ASSERT_CHECKING
-		true, NULL, NULL	/* true by default on debug builds. */
+#if defined(USE_ASSERT_CHECKING) && defined(USE_CODEGEN)
+		true, 	/* true by default on debug builds. */
 #else
-		false, NULL, NULL
+		false,
 #endif
-
+		assign_codegen, NULL
 	},
 	/* End-of-list marker */
 	{
@@ -5937,6 +5938,19 @@ assign_optimizer(bool newval, bool doit, GucSource source)
 	return true;
 }
 
+static bool
+assign_codegen(bool newval, bool doit, GucSource source)
+{
+#ifndef USE_CODEGEN
+	if (newval)
+		ereport(ERROR,
+				(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
+				 errmsg("Code generation is not supported by this build")));
+#endif
+
+	return true;
+}
+
 static bool
 assign_dispatch_log_stats(bool newval, bool doit, GucSource source)
 {