https://github.com/phaag/nfdump/issues/507
https://github.com/phaag/nfdump/commit/5e08f546877be781bff279ca45981c844eb85f50

From: Peter Haag <peter@people.ops-trust.net>
Date: Thu, 22 Aug 2024 21:38:53 +0200
Subject: [PATCH] Fix #507 - gcc-14 issues with rrd version 1.9.x

--- a/configure.ac
+++ b/configure.ac
@@ -206,6 +206,8 @@ cat >>config.h <<_ACEOF
 #define HAVE_LIBRRD 1
 _ACEOF
 RRD_LIBS="-lrrd"
+saved_LIBS=$LIBS
+LIBS="${LIBS} -lrrd"
 AC_SUBST(RRD_LIBS)
 ]
 , AC_MSG_ERROR(Can not link librrd. Please specify --with-rrdpath=.. configure failed! ))
@@ -215,17 +217,29 @@ AC_SUBST(RRD_LIBS)
 	else
 		AC_MSG_ERROR(Required rrd.h header file not found!)
 	fi
-	AC_RUN_IFELSE(
-		[ AC_LANG_PROGRAM(
-			[[
+	AC_RUN_IFELSE([AC_LANG_SOURCE([[
 				#include <stdio.h>
+				#include <stdlib.h>
 				#include <rrd.h>
-			]],
-            [[ 
-				rrd_value_t d; 
+      
+			int main(int argc, char **argv) {
+
+				char *s = rrd_strversion();
+    		if ( s != NULL && strlen(s) == 5 ) {
+        	if ( s[0] == '1' && s[1] == '.' ) {
+            int ver = s[2] - 0x30;
+            if ( argc > 1 ) printf("%d\n", ver);
+        	}
+    		} else {
+					exit(255);
+    		}
+				return 0;
+			}
 			]])
-		],, AC_MSG_ERROR(Can not load rrd library. Not in loader search path! ))
-
+		],rrdversion=$(./conftest$EXEEXT print 2>&1)
+		LIBS=$saved_LIBS
+    AC_DEFINE_UNQUOTED(HAVE_RRDVERSION, $rrdversion, [ ])
+		, AC_MSG_ERROR(Can not load rrd library. Not in loader search path! ))
 ]
 ,
 build_nfprofile="no"
--- a/src/nfsen/nftrack_rrd.c
+++ b/src/nfsen/nftrack_rrd.c
@@ -48,6 +48,12 @@
 #include "rrd.h"
 #include "util.h"
 
+#if HAVE_RRDVERSION > 8
+#define rrdchar const char
+#else
+#define rrdchar char
+#endif
+
 #define BUFF_CHECK(num, buffsize)                               \
     if ((num) >= (buffsize)) {                                  \
         fprintf(stderr, "No enough space to create RRD arg\n"); \
@@ -153,7 +159,7 @@ static void CreateRRDB(char *filename, time_t when) {
     */
 
     rrd_clear_error();
-    if ((i = rrd_create(argc, rrd_arg))) {
+    if ((i = rrd_create(argc, (rrdchar **)rrd_arg))) {
         fprintf(stderr, "Create DB Error: %ld %s\n", i, rrd_get_error());
     }
 
@@ -329,12 +335,12 @@ int RRD_StoreDataRow(char *path, char *iso_time, data_row *row) {
                 optind = 0;
                 opterr = 0;
                 rrd_clear_error();
-                if ((i = rrd_update(argc, rrd_arg))) {
+                if ((i = rrd_update(argc, (rrdchar **)rrd_arg))) {
                     fprintf(stderr, "RRD: %s Insert Error: %d %s\n", rrd_filename, i, rrd_get_error());
                 }
             }  // for all 64 rrd files
-        }      // for every type flows - packets - bytes
-    }          // for every protocol TCP - UDP
+        }  // for every type flows - packets - bytes
+    }  // for every protocol TCP - UDP
 
     return 1;
 }  // End of RRD_StoreDataRow
@@ -423,7 +429,7 @@ data_row *RRD_GetDataRow(char *path, time_t when) {
                 optind = 0;
                 opterr = 0;
                 rrd_clear_error();
-                if ((ret = rrd_fetch(argc, rrd_arg, &when, &when, &step, &ds_cnt, &ds_namv, &data))) {
+                if ((ret = rrd_fetch(argc, (rrdchar **)rrd_arg, &when, &when, &step, &ds_cnt, &ds_namv, &data))) {
                     fprintf(stderr, "RRD: %s Fetch Error: %d %s\n", rrd_filename, ret, rrd_get_error());
                 }
                 if (ds_cnt != 1024) {
@@ -442,8 +448,8 @@ data_row *RRD_GetDataRow(char *path, time_t when) {
                 free(data);
 
             }  // for all 64 rrd files
-        }      // for every type flows - packets - bytes
-    }          // for every protocol TCP - UDP
+        }  // for every type flows - packets - bytes
+    }  // for every protocol TCP - UDP
 
     return row;
 
@@ -474,7 +480,7 @@ time_t RRD_LastUpdate(char *path) {
     rrd_arg[argc++] = rrd_filename;
     rrd_arg[argc] = NULL;
 
-    when = rrd_last(argc, rrd_arg);
+    when = rrd_last(argc, (rrdchar **)rrd_arg);
 
     return when;
 
--- a/src/nfsen/profile.c
+++ b/src/nfsen/profile.c
@@ -1,5 +1,5 @@
 /*
- *  Copyright (c) 2009-2023, Peter Haag
+ *  Copyright (c) 2009-2024, Peter Haag
  *  Copyright (c) 2004-2008, SWITCH - Teleinformatikdienste fuer Lehre und Forschung
  *  All rights reserved.
  *
@@ -59,6 +59,12 @@ extern char influxdb_url[1024];
 static char influxdb_measurement[] = "nfsen_stats";
 #endif
 
+#if HAVE_RRDVERSION > 8
+#define rrdchar const char
+#else
+#define rrdchar char
+#endif
+
 /* imported vars */
 extern char yyerror_buff[256];
 
@@ -449,7 +455,7 @@ void UpdateRRD(time_t tslot, profile_channel_info_t *channel) {
     opterr = 0;
     rrd_clear_error();
     int i = 0;
-    if ((i = rrd_update(argc, rrd_arg)) != 0) {
+    if ((i = rrd_update(argc, (rrdchar **)rrd_arg)) != 0) {
         LogError("RRD: %s Insert Error: %d %s\n", channel->rrdfile, i, rrd_get_error());
     }