From 555c8924a60e193ab9e44d3193e055f311967779 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Christoph=20Gr=C3=BCninger?= <foss@grueninger.de>
Date: Sun, 22 Mar 2026 13:53:26 +0100
Subject: [PATCH 1/4] [cleanup] Remove semicolon after function

Found by GCC 16 (-Wpedantic).
---
 experimental/benchmark/edgeBetweennessCentrality_demo.c | 2 +-
 experimental/test/test_SquareClustering.c               | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/experimental/benchmark/edgeBetweennessCentrality_demo.c b/experimental/benchmark/edgeBetweennessCentrality_demo.c
index 97dc9ebe37..740d7d6093 100644
--- a/experimental/benchmark/edgeBetweennessCentrality_demo.c
+++ b/experimental/benchmark/edgeBetweennessCentrality_demo.c
@@ -29,7 +29,7 @@ double difference(GrB_Matrix bc, GrB_Matrix reference_bc)
     GrB_free(&diff) ;
 
     return err ;
-} ;
+}
 
 int main (int argc, char **argv)
 {
diff --git a/experimental/test/test_SquareClustering.c b/experimental/test/test_SquareClustering.c
index bca843d750..a355082889 100644
--- a/experimental/test/test_SquareClustering.c
+++ b/experimental/test/test_SquareClustering.c
@@ -100,7 +100,7 @@ void test_SquareClustering (void)
     OK (LAGraph_Delete (&G, msg)) ;
 
     LAGraph_Finalize (msg) ;
-};
+}
 
 TEST_LIST = {
     {"SquareClustering", test_SquareClustering},

From e313c3484e62e15bb0e10997520fc3f464740009 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Christoph=20Gr=C3=BCninger?= <foss@grueninger.de>
Date: Sun, 22 Mar 2026 20:06:11 +0100
Subject: [PATCH 2/4] LAGraph_Hash_Vector: Fix outdated return type

Found by GCC 16 (-Wenum-int-mismatch).
---
 include/LAGraphX.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/LAGraphX.h b/include/LAGraphX.h
index fa5058fe5e..f2931345c2 100644
--- a/include/LAGraphX.h
+++ b/include/LAGraphX.h
@@ -261,7 +261,7 @@ int LAGraph_Incidence_Matrix
 ) ;
 
 LAGRAPHX_PUBLIC
-int LAGraph_Hash_Vector
+GrB_Info LAGraph_Hash_Vector
 (
     uint64_t *hash,
     GrB_Vector v,

From 6438ac007d99092247d3ea28291aa489d21a1ed1 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Christoph=20Gr=C3=BCninger?= <foss@grueninger.de>
Date: Mon, 23 Mar 2026 07:46:49 +0100
Subject: [PATCH 3/4] [cleanup] Remove some unused variables

Found by GCC 16 (-Wunused-variable).
---
 experimental/algorithm/LAGr_MaxFlow.c                   | 2 ++
 experimental/benchmark/FastAssign_demo.c                | 3 ---
 experimental/benchmark/Incidence_Matrix_demo.c          | 2 +-
 experimental/benchmark/SwapEdges_demo.c                 | 2 +-
 experimental/benchmark/apply_demo.c                     | 1 -
 experimental/benchmark/build_demo.c                     | 2 +-
 experimental/benchmark/coarsen_matching_demo.c          | 1 -
 experimental/benchmark/coloring_IS_demo.c               | 4 ++--
 experimental/benchmark/coloring_MIS_demo.c              | 4 ++--
 experimental/benchmark/colscale_demo.c                  | 1 -
 experimental/benchmark/dnn_demo.c                       | 2 --
 experimental/benchmark/dot3_demo.c                      | 6 +++---
 experimental/benchmark/edgeBetweennessCentrality_demo.c | 1 -
 experimental/benchmark/fglt_demo.c                      | 2 --
 experimental/benchmark/hdip_fiedler_demo.c              | 3 ++-
 experimental/benchmark/helloworld_demo.c                | 2 +-
 experimental/benchmark/hits_demo.c                      | 3 +--
 experimental/benchmark/kt_demo.c                        | 3 +--
 experimental/benchmark/mcl_demo.c                       | 2 +-
 experimental/benchmark/mcm_demo.c                       | 2 +-
 experimental/benchmark/msf_demo.c                       | 2 +-
 experimental/benchmark/peer_pressure_demo.c             | 2 +-
 experimental/benchmark/rcc_demo.c                       | 2 +-
 experimental/benchmark/rowscale_demo.c                  | 5 -----
 experimental/benchmark/select_demo.c                    | 3 +--
 experimental/test/test_cdlp.c                           | 2 --
 experimental/test/test_dnn.c                            | 1 -
 experimental/test/test_lcc.c                            | 2 --
 experimental/test/test_msf.c                            | 1 -
 experimental/test/test_mxm.c                            | 1 -
 src/benchmark/LAGraph_demo.h                            | 1 -
 31 files changed, 23 insertions(+), 47 deletions(-)

diff --git a/experimental/algorithm/LAGr_MaxFlow.c b/experimental/algorithm/LAGr_MaxFlow.c
index a0fdb24663..79b5daf6f0 100644
--- a/experimental/algorithm/LAGr_MaxFlow.c
+++ b/experimental/algorithm/LAGr_MaxFlow.c
@@ -723,7 +723,9 @@ int LAGr_MaxFlow
   GrB_Vector invariant = NULL ;
   GrB_BinaryOp CheckInvariant = NULL ;
   GrB_Scalar check = NULL ;
+  #ifdef DBG
   bool check_raw;
+  #endif
 
   // descriptor for matrix building
   GrB_Descriptor desc = NULL ;
diff --git a/experimental/benchmark/FastAssign_demo.c b/experimental/benchmark/FastAssign_demo.c
index a4139d28bd..d9e653ab33 100644
--- a/experimental/benchmark/FastAssign_demo.c
+++ b/experimental/benchmark/FastAssign_demo.c
@@ -50,10 +50,7 @@ int main (int argc, char **argv)
     GrB_Index *rand_a = NULL;
     GrB_Scalar bool1 = NULL;
     bool *set_a = NULL;
-    GrB_Index r_size = 0, ramp_size = 0, junk_size = 0;
-    bool iso = false;
 
-    bool *val_of_P = NULL;
     double t = LAGraph_WallClockTime ( ) ;
     GrB_Index size = (argc > 1) ? atoll(argv [1]) : 1000 ;
     int shift_e = 63 - (int) floor (log2 ((double) size)) ;
diff --git a/experimental/benchmark/Incidence_Matrix_demo.c b/experimental/benchmark/Incidence_Matrix_demo.c
index 4d2bd74a52..5344c55273 100644
--- a/experimental/benchmark/Incidence_Matrix_demo.c
+++ b/experimental/benchmark/Incidence_Matrix_demo.c
@@ -58,7 +58,7 @@ int main (int argc, char **argv)
     // mtx2bin_demo).
 
     double t = LAGraph_WallClockTime ( ) ;
-    char *matrix_name = (argc > 1) ? argv [1] : "stdin" ;
+    //char *matrix_name = (argc > 1) ? argv [1] : "stdin" ;
     LG_TRY (readproblem (
         &G,         // the graph that is read from stdin or a file
         NULL,       // source nodes (none, if NULL)
diff --git a/experimental/benchmark/SwapEdges_demo.c b/experimental/benchmark/SwapEdges_demo.c
index ffc9c7d65d..0bdcd1b15b 100644
--- a/experimental/benchmark/SwapEdges_demo.c
+++ b/experimental/benchmark/SwapEdges_demo.c
@@ -57,7 +57,7 @@ int main (int argc, char **argv)
 
     double t = LAGraph_WallClockTime ( ) ;
     GrB_Index swaps = (argc > 2) ? atoi(argv [2]): 100;
-    char *matrix_name = (argc > 1) ? argv [1] : "stdin" ;
+    //char *matrix_name = (argc > 1) ? argv [1] : "stdin" ;
     FILE *f = (argc > 3) ? fopen (argv[3], "w"): NULL;
     LG_TRY (readproblem (
         &G,         // the graph that is read from stdin or a file
diff --git a/experimental/benchmark/apply_demo.c b/experimental/benchmark/apply_demo.c
index b9fc402b08..2d85fbdd58 100644
--- a/experimental/benchmark/apply_demo.c
+++ b/experimental/benchmark/apply_demo.c
@@ -21,7 +21,6 @@ int main(int argc, char **argv)
 {
     char msg [LAGRAPH_MSG_LEN] ;
 
-    LAGraph_Graph G = NULL ;
     GrB_Matrix A = NULL ;
     GrB_Matrix Res = NULL ;
     GrB_Scalar s = NULL ;
diff --git a/experimental/benchmark/build_demo.c b/experimental/benchmark/build_demo.c
index c59a6948d7..df10915c54 100644
--- a/experimental/benchmark/build_demo.c
+++ b/experimental/benchmark/build_demo.c
@@ -70,7 +70,7 @@ int main (int argc, char **argv)
     // mtx2bin_demo).
 
     double t = LAGraph_WallClockTime ( ) ;
-    char *matrix_name = (argc > 1) ? argv [1] : "stdin" ;
+    //char *matrix_name = (argc > 1) ? argv [1] : "stdin" ;
     LG_TRY (readproblem (
         &G,         // the graph that is read from stdin or a file
         NULL,       // source nodes (none, if NULL)
diff --git a/experimental/benchmark/coarsen_matching_demo.c b/experimental/benchmark/coarsen_matching_demo.c
index 1e1be4ad74..c073aa6955 100644
--- a/experimental/benchmark/coarsen_matching_demo.c
+++ b/experimental/benchmark/coarsen_matching_demo.c
@@ -150,7 +150,6 @@ int main(int argc, char **argv)
 
         for (int trial = 0 ; trial < ntrials ; trial++)
         {
-            int64_t seed = trial * n + 1 ;
             double tt = LAGraph_WallClockTime ( ) ;
 
             LG_TRY (LAGraph_Coarsen_Matching (&coarsened, &parent_result, &newlabel_result, &inv_newlabel_result, G, LAGraph_Matching_heavy, 0, 1, DEFAULT_SEED, msg)) ;
diff --git a/experimental/benchmark/coloring_IS_demo.c b/experimental/benchmark/coloring_IS_demo.c
index e597621f05..d1dd127744 100644
--- a/experimental/benchmark/coloring_IS_demo.c
+++ b/experimental/benchmark/coloring_IS_demo.c
@@ -36,7 +36,7 @@ int main (int argc, char **argv)
     //--------------------------------------------------------------------------
 
     double t = LAGraph_WallClockTime ( ) ;
-    char *matrix_name = (argc > 1) ? argv [1] : "stdin" ;
+    //char *matrix_name = (argc > 1) ? argv [1] : "stdin" ;
     LG_TRY (readproblem (
         &G,         // the graph that is read from stdin or a file
         NULL,       // source nodes (none, if NULL)
@@ -58,6 +58,7 @@ int main (int argc, char **argv)
     
     t = LAGraph_WallClockTime ( ) ;
     int status = (LAGraph_coloring_independent_set (&C, &num_colors, G, msg)) ;
+    LG_TRY(status);
     alg_time = LAGraph_WallClockTime ( ) - t ;
     printf ("Time for IS Coloring:        %g sec\n", alg_time) ;
 
@@ -65,7 +66,6 @@ int main (int argc, char **argv)
     // check the results
     //--------------------------------------------------------------------------
 
-    bool isequal ;
     t = LAGraph_WallClockTime ( ) ;
     LAGRAPH_TRY (LG_check_coloring(G, C, msg)) ;
     t = LAGraph_WallClockTime ( ) - t ;
diff --git a/experimental/benchmark/coloring_MIS_demo.c b/experimental/benchmark/coloring_MIS_demo.c
index 73a5488fad..87e9418665 100644
--- a/experimental/benchmark/coloring_MIS_demo.c
+++ b/experimental/benchmark/coloring_MIS_demo.c
@@ -36,7 +36,7 @@ int main (int argc, char **argv)
     //--------------------------------------------------------------------------
 
     double t = LAGraph_WallClockTime ( ) ;
-    char *matrix_name = (argc > 1) ? argv [1] : "stdin" ;
+    //char *matrix_name = (argc > 1) ? argv [1] : "stdin" ;
     LG_TRY (readproblem (
         &G,         // the graph that is read from stdin or a file
         NULL,       // source nodes (none, if NULL)
@@ -58,6 +58,7 @@ int main (int argc, char **argv)
     
     t = LAGraph_WallClockTime ( ) ;
     int status = (LAGraph_coloring_MIS (&C, &num_colors, G, msg)) ;
+    LG_TRY(status);
     alg_time = LAGraph_WallClockTime ( ) - t ;
     printf ("Time for MIS Coloring:        %g sec\n", alg_time) ;
 
@@ -65,7 +66,6 @@ int main (int argc, char **argv)
     // check the results
     //--------------------------------------------------------------------------
 
-    bool isequal ;
     t = LAGraph_WallClockTime ( ) ;
     LAGRAPH_TRY (LG_check_coloring(G, C, msg)) ;
     t = LAGraph_WallClockTime ( ) - t ;
diff --git a/experimental/benchmark/colscale_demo.c b/experimental/benchmark/colscale_demo.c
index 1085e0aee9..fb02b9978e 100644
--- a/experimental/benchmark/colscale_demo.c
+++ b/experimental/benchmark/colscale_demo.c
@@ -18,7 +18,6 @@ int main(int argc, char **argv)
 {
     char msg [LAGRAPH_MSG_LEN] ;
 
-    LAGraph_Graph G = NULL ;
     GrB_Matrix D = NULL ;
     GrB_Matrix A = NULL ;
     GrB_Matrix Res = NULL ;
diff --git a/experimental/benchmark/dnn_demo.c b/experimental/benchmark/dnn_demo.c
index 12dbce2d26..61b5783f8e 100644
--- a/experimental/benchmark/dnn_demo.c
+++ b/experimental/benchmark/dnn_demo.c
@@ -106,7 +106,6 @@ int LAGraph_tsvread
     // create the output matrix
     //--------------------------------------------------------------------------
 
-    GrB_Info info ;
     GrB_Matrix C = NULL ;
     (*Chandle) = NULL ;
     GRB_TRY (GrB_Matrix_new (&C, type, nrows, ncols)) ;
@@ -183,7 +182,6 @@ int main (int argc, char **argv)
     // start LAGraph and GraphBLAS
     //--------------------------------------------------------------------------
 
-    GrB_Info info ;
     char msg [LAGRAPH_MSG_LEN] ;
     LG_TRY (LAGraph_Init (NULL)) ;
 
diff --git a/experimental/benchmark/dot3_demo.c b/experimental/benchmark/dot3_demo.c
index 2464f74819..3a1e7d3c25 100644
--- a/experimental/benchmark/dot3_demo.c
+++ b/experimental/benchmark/dot3_demo.c
@@ -51,7 +51,7 @@ int main (int argc, char **argv)
     // mtx2bin_demo).
 
     double t = LAGraph_WallClockTime ( ) ;
-    char *matrix_name = (argc > 1) ? argv [1] : "stdin" ;
+    //char *matrix_name = (argc > 1) ? argv [1] : "stdin" ;
     LG_TRY (readproblem (
         &G,         // the graph that is read from stdin or a file
         NULL,       // source nodes (none, if NULL)
@@ -85,14 +85,14 @@ int main (int argc, char **argv)
     printf ("GrB_mxm: C<A> = A*A', %d trials\n", NTRIALS) ;
 
     t = LAGraph_WallClockTime ( ) ;
-    double t1 = t ;
+    // double t1 = t ;
     for (int k = 0 ; k < NTRIALS ; k++)
     {
         // C<A,struct> = A*A'
         GRB_TRY (GrB_mxm (C, A, NULL, LAGraph_plus_one_uint32, A, A,
             GrB_DESC_RST1)) ;
-        double tt = LAGraph_WallClockTime ( ) - t1 ;
         #if 0
+        double tt = LAGraph_WallClockTime ( ) - t1 ;
         if (tt > 3)
         {
             printf ("%d ok, %g sec\n", k, LAGraph_WallClockTime ( ) - t) ;
diff --git a/experimental/benchmark/edgeBetweennessCentrality_demo.c b/experimental/benchmark/edgeBetweennessCentrality_demo.c
index 740d7d6093..4cdeafda42 100644
--- a/experimental/benchmark/edgeBetweennessCentrality_demo.c
+++ b/experimental/benchmark/edgeBetweennessCentrality_demo.c
@@ -41,7 +41,6 @@ int main (int argc, char **argv)
     LAGraph_Graph G = NULL;
     GrB_Matrix centrality = NULL, A = NULL;
     GrB_Vector sources = NULL;
-    GrB_Info info;
 
     // start GraphBLAS and LAGraph
     LAGRAPH_TRY (LAGraph_Init (msg));
diff --git a/experimental/benchmark/fglt_demo.c b/experimental/benchmark/fglt_demo.c
index 7125d37afc..7a24d0f0a1 100644
--- a/experimental/benchmark/fglt_demo.c
+++ b/experimental/benchmark/fglt_demo.c
@@ -43,7 +43,6 @@ int main (int argc, char **argv)
 
     GrB_Matrix A = NULL ;
     GrB_Matrix Fnet = NULL ;
-    GrB_Matrix Abool = NULL ;
     FILE *f = NULL ;
 
     // start GraphBLAS and LAGraph
@@ -115,7 +114,6 @@ int main (int argc, char **argv)
 
         for (int trial = 0 ; trial < ntrials ; trial++)
         {
-            int64_t seed = trial * n + 1 ;
             double tt = LAGraph_WallClockTime ( ) ;
             LAGRAPH_TRY (LAGraph_FastGraphletTransform (&Fnet, G, true, msg)) ;
             tt = LAGraph_WallClockTime ( ) - tt ;
diff --git a/experimental/benchmark/hdip_fiedler_demo.c b/experimental/benchmark/hdip_fiedler_demo.c
index f4fc25c5ff..58dd98d01b 100644
--- a/experimental/benchmark/hdip_fiedler_demo.c
+++ b/experimental/benchmark/hdip_fiedler_demo.c
@@ -257,7 +257,7 @@ int main(int argc, char **argv)
     // mtx2bin_demo).
 
     double t = LAGraph_WallClockTime();
-    char *matrix_name = (argc > 1) ? argv[1] : "stdin";
+    //char *matrix_name = (argc > 1) ? argv[1] : "stdin";
     
     LG_TRY(readproblem(
         &G,           // the graph that is read from stdin or a file
@@ -327,6 +327,7 @@ int main(int argc, char **argv)
 
     t = LAGraph_WallClockTime( );
     int result = LAGraph_mypcg2(&steper, &k, Y, u, alpha, indiag, x, .000001, 50, msg);
+    LG_TRY(result);
     t = LAGraph_WallClockTime( ) - t;
     printf("Time for LAGraph_mypcg2: %g sec\n", t);
 
diff --git a/experimental/benchmark/helloworld_demo.c b/experimental/benchmark/helloworld_demo.c
index e05ad91ce3..0135ea15da 100644
--- a/experimental/benchmark/helloworld_demo.c
+++ b/experimental/benchmark/helloworld_demo.c
@@ -74,7 +74,7 @@ int main (int argc, char **argv)
     // mtx2bin_demo).
 
     double t = LAGraph_WallClockTime ( ) ;
-    char *matrix_name = (argc > 1) ? argv [1] : "stdin" ;
+    //char *matrix_name = (argc > 1) ? argv [1] : "stdin" ;
     LG_TRY (readproblem (
         &G,         // the graph that is read from stdin or a file
         NULL,       // source nodes (none, if NULL)
diff --git a/experimental/benchmark/hits_demo.c b/experimental/benchmark/hits_demo.c
index 44f6dd1952..c4272f0572 100644
--- a/experimental/benchmark/hits_demo.c
+++ b/experimental/benchmark/hits_demo.c
@@ -66,7 +66,7 @@ int main (int argc, char **argv)
     // mtx2bin_demo).
 
     double t = LAGraph_WallClockTime ( ) ;
-    char *matrix_name = (argc > 1) ? argv [1] : "stdin" ;
+    //char *matrix_name = (argc > 1) ? argv [1] : "stdin" ;
     LG_TRY (readproblem (
         &G,         // the graph that is read from stdin or a file
         NULL,       // source nodes (none, if NULL)
@@ -101,4 +101,3 @@ int main (int argc, char **argv)
     LG_TRY (LAGraph_Finalize (msg)) ;
     return (GrB_SUCCESS) ;
 }
-    
\ No newline at end of file
diff --git a/experimental/benchmark/kt_demo.c b/experimental/benchmark/kt_demo.c
index c6622f6162..4ee5d02241 100644
--- a/experimental/benchmark/kt_demo.c
+++ b/experimental/benchmark/kt_demo.c
@@ -39,7 +39,6 @@ int main (int argc, char **argv)
 
     char msg [LAGRAPH_MSG_LEN] ;        // for error messages from LAGraph
     LAGraph_Graph G = NULL ;
-    GrB_Matrix C = NULL, R = NULL ;
     GrB_Matrix *Cset = NULL ;
     int64_t *ntris = NULL, *nedges = NULL, *nsteps = NULL ;
 
@@ -56,7 +55,7 @@ int main (int argc, char **argv)
     // mtx2bin_demo).
 
     double t = LAGraph_WallClockTime ( ) ;
-    char *matrix_name = (argc > 1) ? argv [1] : "stdin" ;
+    //char *matrix_name = (argc > 1) ? argv [1] : "stdin" ;
     LG_TRY (readproblem (
         &G,         // the graph that is read from stdin or a file
         NULL,       // source nodes (none, if NULL)
diff --git a/experimental/benchmark/mcl_demo.c b/experimental/benchmark/mcl_demo.c
index 63e97dbeaf..a45a670f23 100644
--- a/experimental/benchmark/mcl_demo.c
+++ b/experimental/benchmark/mcl_demo.c
@@ -66,7 +66,7 @@ int main(int argc, char **argv)
     // read in the graph
     //--------------------------------------------------------------------------
 
-    char *matrix_name = (argc > 1) ? argv[1] : "stdin";
+    //char *matrix_name = (argc > 1) ? argv[1] : "stdin";
     LAGRAPH_TRY(
         readproblem(&G, NULL, false, false, false, NULL, false, argc, argv));
 
diff --git a/experimental/benchmark/mcm_demo.c b/experimental/benchmark/mcm_demo.c
index ed0a4f8ecb..0f141f43ed 100644
--- a/experimental/benchmark/mcm_demo.c
+++ b/experimental/benchmark/mcm_demo.c
@@ -143,7 +143,7 @@ int main(int argc, char **argv)
         fflush(stdout);
         return 0;
     }
-    char *matrix_name = (argc > 1) ? argv[1] : "stdin";
+    //char *matrix_name = (argc > 1) ? argv[1] : "stdin";
 
     bool make_symmetric = false, remove_self_edges = false, structural = true,
          ensure_positive = false;
diff --git a/experimental/benchmark/msf_demo.c b/experimental/benchmark/msf_demo.c
index 292cd2f161..2d862f06e3 100644
--- a/experimental/benchmark/msf_demo.c
+++ b/experimental/benchmark/msf_demo.c
@@ -56,7 +56,7 @@ int main (int argc, char **argv)
     // mtx2bin_demo).
 
     double t = LAGraph_WallClockTime ( ) ;
-    char *matrix_name = (argc > 1) ? argv [1] : "stdin" ;
+    //char *matrix_name = (argc > 1) ? argv [1] : "stdin" ;
     LG_TRY (readproblem (
         &G,         // the graph that is read from stdin or a file
         NULL,       // source nodes (none, if NULL)
diff --git a/experimental/benchmark/peer_pressure_demo.c b/experimental/benchmark/peer_pressure_demo.c
index 57bc6de9b8..a655169030 100644
--- a/experimental/benchmark/peer_pressure_demo.c
+++ b/experimental/benchmark/peer_pressure_demo.c
@@ -64,7 +64,7 @@ int main(int argc, char **argv)
     // read in the graph
     //--------------------------------------------------------------------------
 
-    char *matrix_name = (argc > 1) ? argv[1] : "stdin";
+    //char *matrix_name = (argc > 1) ? argv[1] : "stdin";
     LAGRAPH_TRY(
         readproblem(&G, NULL, false, false, false, NULL, false, argc, argv));
 
diff --git a/experimental/benchmark/rcc_demo.c b/experimental/benchmark/rcc_demo.c
index a98348808f..c69ab14380 100644
--- a/experimental/benchmark/rcc_demo.c
+++ b/experimental/benchmark/rcc_demo.c
@@ -71,7 +71,7 @@ int main (int argc, char **argv)
     // mtx2bin_demo).
 
     double t = LAGraph_WallClockTime ( ) ;
-    char *matrix_name = (argc > 1) ? argv [1] : "stdin" ;
+    //char *matrix_name = (argc > 1) ? argv [1] : "stdin" ;
     LG_TRY (readproblem (
         &G,         // the graph that is read from stdin or a file
         NULL,       // source nodes (none, if NULL)
diff --git a/experimental/benchmark/rowscale_demo.c b/experimental/benchmark/rowscale_demo.c
index 23dc23384d..698fd4be0c 100644
--- a/experimental/benchmark/rowscale_demo.c
+++ b/experimental/benchmark/rowscale_demo.c
@@ -18,7 +18,6 @@ int main(int argc, char **argv)
 {
     char msg [LAGRAPH_MSG_LEN] ;
 
-    LAGraph_Graph G = NULL ;
     GrB_Matrix D = NULL ;
     GrB_Matrix B = NULL ;
     GrB_Matrix Res = NULL ;
@@ -27,10 +26,6 @@ int main(int argc, char **argv)
     bool burble = false ; 
     demo_init (burble) ;
 
-    GrB_Index n = (argc > 2 ? atoi (argv [2]) : DEFAULT_SIZE) ;
-    double density = (argc > 3 ? atof (argv [3]) : DEFAULT_DENSITY) ;
-    uint64_t seed = (argc > 4 ? atoll (argv [4]) : DEFAULT_SEED) ;
-
     int ntrials = 10 ;
 
     for (int i = 0 ; i < ntrials ; i++) {
diff --git a/experimental/benchmark/select_demo.c b/experimental/benchmark/select_demo.c
index 8cab3bbc6d..f81c6b99f2 100644
--- a/experimental/benchmark/select_demo.c
+++ b/experimental/benchmark/select_demo.c
@@ -21,7 +21,6 @@ int main(int argc, char **argv)
 {
     char msg [LAGRAPH_MSG_LEN] ;
 
-    LAGraph_Graph G = NULL ;
     GrB_Matrix A = NULL ;
     GrB_Matrix Res = NULL ;
     GrB_Scalar s = NULL ;
@@ -44,7 +43,7 @@ int main(int argc, char **argv)
 
         GRB_TRY (GrB_Matrix_new (&Res, GrB_FP64, n, n)) ;
 
-        GrB_Index D_nvals, A_nvals ;
+        GrB_Index A_nvals ;
         GRB_TRY (GrB_Matrix_nvals (&A_nvals, A)) ;
         printf ("nvals: A: %" PRIu64 "\n", A_nvals) ;
 
diff --git a/experimental/test/test_cdlp.c b/experimental/test/test_cdlp.c
index 4e639b9c76..45ea13ae0c 100644
--- a/experimental/test/test_cdlp.c
+++ b/experimental/test/test_cdlp.c
@@ -130,8 +130,6 @@ void test_errors (void)
     OK (LAGraph_DeleteSelfEdges (G, msg)) ;
     OK (LAGraph_Cached_IsSymmetricStructure (G, msg)) ;
 
-    GrB_Vector c = NULL ;
-
     // c is NULL
     int result = LAGraph_cdlp (NULL, G, 100, msg) ;
     printf ("\nresult: %d\n", result) ;
diff --git a/experimental/test/test_dnn.c b/experimental/test/test_dnn.c
index f7004ba9fb..077c18e170 100644
--- a/experimental/test/test_dnn.c
+++ b/experimental/test/test_dnn.c
@@ -56,7 +56,6 @@ void teardown (void)
 
 void test_dnn (void)
 {
-    GrB_Info info ;
     setup ( ) ;
 
     #define NLAYERS 30
diff --git a/experimental/test/test_lcc.c b/experimental/test/test_lcc.c
index 13df5af543..5dfe2ae148 100644
--- a/experimental/test/test_lcc.c
+++ b/experimental/test/test_lcc.c
@@ -141,8 +141,6 @@ void test_errors (void)
     OK (LAGraph_Cached_IsSymmetricStructure (G, msg));
     OK (LAGraph_Cached_NSelfEdges (G, msg)) ;
 
-    GrB_Vector c = NULL ;
-
     // c is NULL
     int result = LAGraph_lcc (NULL, G, msg) ;
     printf ("\nresult: %d\n", result) ;
diff --git a/experimental/test/test_msf.c b/experimental/test/test_msf.c
index 2a84cf77be..c4204ec540 100644
--- a/experimental/test/test_msf.c
+++ b/experimental/test/test_msf.c
@@ -206,7 +206,6 @@ void test_inf_msf (void)
 
     // load the matrix as A
     const char *aname = "bcsstk13.mtx" ;
-    bool symmetric = 1 ;
     printf ("\n================================== %s:\n", aname) ;
     TEST_CASE (aname) ;
     snprintf (filename, LEN, LG_DATA_DIR "%s", aname) ;
diff --git a/experimental/test/test_mxm.c b/experimental/test/test_mxm.c
index 1d3c21c8bb..5bf6ebe04a 100644
--- a/experimental/test/test_mxm.c
+++ b/experimental/test/test_mxm.c
@@ -35,7 +35,6 @@ GrB_Matrix A = NULL, B = NULL, C2 = NULL, Cin = NULL, C = NULL ;
 void test_mxm (void)
 {
 
-    GrB_Info info ;
     OK (LAGraph_Init (msg)) ;
     uint64_t n = 256 ;
     uint64_t seed = 0 ;
diff --git a/src/benchmark/LAGraph_demo.h b/src/benchmark/LAGraph_demo.h
index ff09900bbf..e4740a9b9a 100644
--- a/src/benchmark/LAGraph_demo.h
+++ b/src/benchmark/LAGraph_demo.h
@@ -1044,7 +1044,6 @@ static int readproblem          // returns 0 if successful, -1 if failure
             {
                 printf ("forcing G-> to be symmetric (via A = A+A')\n") ;
                 GrB_BinaryOp op = NULL ;
-                GrB_Type type ;
                 if      (atype == GrB_BOOL  ) op = GrB_LOR ;
                 else if (atype == GrB_INT8  ) op = GrB_PLUS_INT8 ;
                 else if (atype == GrB_INT16 ) op = GrB_PLUS_INT16 ;

From 3e215588f829e8f5be1950fad04b2dc6f45900f7 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Christoph=20Gr=C3=BCninger?= <foss@grueninger.de>
Date: Sun, 22 Mar 2026 19:55:26 +0100
Subject: [PATCH 4/4] LAGraph_Version: Use char pointer instead of array

Match with declaration in header.
Found by GCC 16 (-Warray-paramter).
---
 src/utility/LAGraph_Version.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/utility/LAGraph_Version.c b/src/utility/LAGraph_Version.c
index 688649ab10..173869359f 100644
--- a/src/utility/LAGraph_Version.c
+++ b/src/utility/LAGraph_Version.c
@@ -35,7 +35,7 @@ int LAGraph_Version
 (
     // output:
     int version_number [3],     // user-provided array of size 3
-    char version_date [LAGRAPH_MSG_LEN],    // user-provided array
+    char *version_date,         // user-provided array of size >= LAGRAPH_MSG_LEN
     char *msg
 )
 {