[svn-r9727] Purpose:

    Bug Fix/Code Cleanup/Doc Cleanup/Optimization/Branch Sync :-)

Description:
    Generally speaking, this is the "signed->unsigned" change to selections.
However, in the process of merging code back, things got stickier and stickier
until I ended up doing a big "sync the two branches up" operation.  So... I
brought back all the "infrastructure" fixes from the development branch to the
release branch (which I think were actually making some improvement in
performance) as well as fixed several bugs which had been fixed in one branch,
but not the other.

    I've also tagged the repository before making this checkin with the label
"before_signed_unsigned_changes".

Platforms tested:
    FreeBSD 4.10 (sleipnir) w/parallel & fphdf5
    FreeBSD 4.10 (sleipnir) w/threadsafe
    FreeBSD 4.10 (sleipnir) w/backward compatibility
    Solaris 2.7 (arabica) w/"purify options"
    Solaris 2.8 (sol) w/FORTRAN & C++
    AIX 5.x (copper) w/parallel & FORTRAN
    IRIX64 6.5 (modi4) w/FORTRAN
    Linux 2.4 (heping) w/FORTRAN & C++


Misc. update:

13 files changed, 110 insertions, 99 deletions

diff --git a/examples/h5_attribute.c b/examples/h5_attribute.c
index 5b3c4f4..76609ec 100644
--- a/examples/h5_attribute.c
+++ b/examples/h5_attribute.c
@@ -1,4 +1,3 @@
-
 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
  * Copyright by the Board of Trustees of the University of Illinois.         *
  * All rights reserved.                                                      *
diff --git a/examples/h5_chunk_read.c b/examples/h5_chunk_read.c
index c6bf728..af87c10 100644
--- a/examples/h5_chunk_read.c
+++ b/examples/h5_chunk_read.c
@@ -1,4 +1,3 @@
-
 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
  * Copyright by the Board of Trustees of the University of Illinois.         *
  * All rights reserved.                                                      *
@@ -39,7 +38,7 @@ main (void)
     hsize_t     chunk_dims[2];
     hsize_t     col_dims[1];
     hsize_t     count[2];
-    hssize_t    offset[2];
+    hsize_t     offset[2];
 
     herr_t      status, status_n;                             
 
@@ -68,24 +67,6 @@ main (void)
 	   rank, (unsigned long)(dims[0]), (unsigned long)(dims[1]));
 
     /*
-     * Get creation properties list.
-     */
-    cparms = H5Dget_create_plist(dataset); /* Get properties handle first. */
-
-    /* 
-     * Check if dataset is chunked.
-     */
-    if (H5D_CHUNKED == H5Pget_layout(cparms))  {
-
-	/*
-	 * Get chunking information: rank and dimensions
-	 */
-	rank_chunk = H5Pget_chunk(cparms, 2, chunk_dims);
-	printf("chunk rank %d, dimensions %lu x %lu\n", rank_chunk,
-	       (unsigned long)(chunk_dims[0]), (unsigned long)(chunk_dims[1]));
-    }
- 
-    /*
      * Define the memory space to read dataset.
      */
     memspace = H5Screate_simple(RANK,dims,NULL);
@@ -103,6 +84,11 @@ main (void)
     }     
 
     /*
+     * Close/release resources.
+     */
+    H5Sclose(memspace);
+
+    /*
      *	    dataset rank 2, dimensions 10 x 5 
      *	    chunk rank 2, dimensions 2 x 5 
 
@@ -145,6 +131,11 @@ main (void)
     }
 
     /*
+     * Close/release resources.
+     */
+    H5Sclose(memspace);
+
+    /*
      *	    Third column: 
      *	    1 
      *	    1 
@@ -159,36 +150,56 @@ main (void)
      */
 
     /*
-     * Define the memory space to read a chunk.
+     * Get creation properties list.
      */
-    memspace = H5Screate_simple(rank_chunk,chunk_dims,NULL);
+    cparms = H5Dget_create_plist(dataset); /* Get properties handle first. */
 
-    /*
-     * Define chunk in the file (hyperslab) to read.
-     */
-    offset[0] = 2;
-    offset[1] = 0;
-    count[0]  = chunk_dims[0];
-    count[1]  = chunk_dims[1];
-    status = H5Sselect_hyperslab(filespace, H5S_SELECT_SET, offset, NULL, 
-				 count, NULL);
+    if (H5D_CHUNKED == H5Pget_layout(cparms))  {
 
-    /*
-     * Read chunk back and display.
-     */
-    status = H5Dread(dataset, H5T_NATIVE_INT, memspace, filespace,
-		     H5P_DEFAULT, chunk_out);
-    printf("\n");
-    printf("Chunk: \n");
-    for (j = 0; j < chunk_dims[0]; j++) {
-	for (i = 0; i < chunk_dims[1]; i++) printf("%d ", chunk_out[j][i]);
-	printf("\n");
-    }     
-    /*
-     *	 Chunk: 
-     *	 1 1 1 0 0 
-     *	 2 0 0 0 0 
-     */
+	/*
+	 * Get chunking information: rank and dimensions
+	 */
+	rank_chunk = H5Pget_chunk(cparms, 2, chunk_dims);
+	printf("chunk rank %d, dimensions %lu x %lu\n", rank_chunk,
+	       (unsigned long)(chunk_dims[0]), (unsigned long)(chunk_dims[1]));
+
+        /*
+         * Define the memory space to read a chunk.
+         */
+        memspace = H5Screate_simple(rank_chunk,chunk_dims,NULL);
+
+        /*
+         * Define chunk in the file (hyperslab) to read.
+         */
+        offset[0] = 2;
+        offset[1] = 0;
+        count[0]  = chunk_dims[0];
+        count[1]  = chunk_dims[1];
+        status = H5Sselect_hyperslab(filespace, H5S_SELECT_SET, offset, NULL, 
+                                     count, NULL);
+
+        /*
+         * Read chunk back and display.
+         */
+        status = H5Dread(dataset, H5T_NATIVE_INT, memspace, filespace,
+                         H5P_DEFAULT, chunk_out);
+        printf("\n");
+        printf("Chunk: \n");
+        for (j = 0; j < chunk_dims[0]; j++) {
+            for (i = 0; i < chunk_dims[1]; i++) printf("%d ", chunk_out[j][i]);
+            printf("\n");
+        }     
+        /*
+         *	 Chunk: 
+         *	 1 1 1 0 0 
+         *	 2 0 0 0 0 
+         */
+
+        /*
+         * Close/release resources.
+         */
+        H5Sclose(memspace);
+    }
 
     /*
      * Close/release resources.
@@ -196,7 +207,6 @@ main (void)
     H5Pclose(cparms);
     H5Dclose(dataset);
     H5Sclose(filespace);
-    H5Sclose(memspace);
     H5Fclose(file);
 
     return 0;
diff --git a/examples/h5_compound.c b/examples/h5_compound.c
index 6cde056..1819734 100644
--- a/examples/h5_compound.c
+++ b/examples/h5_compound.c
@@ -1,4 +1,3 @@
-
 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
  * Copyright by the Board of Trustees of the University of Illinois.         *
  * All rights reserved.                                                      *
diff --git a/examples/h5_drivers.c b/examples/h5_drivers.c
index 51c7657..ebe870b 100644
--- a/examples/h5_drivers.c
+++ b/examples/h5_drivers.c
@@ -1,4 +1,3 @@
-
 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
  * Copyright by the Board of Trustees of the University of Illinois.         *
  * All rights reserved.                                                      *
diff --git a/examples/h5_dtransform.c b/examples/h5_dtransform.c
index 153778a..3c15eec 100644
--- a/examples/h5_dtransform.c
+++ b/examples/h5_dtransform.c
@@ -1,4 +1,3 @@
-
 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
  * Copyright by the Board of Trustees of the University of Illinois.         *
  * All rights reserved.                                                      *
diff --git a/examples/h5_extend_write.c b/examples/h5_extend_write.c
index 862cb98..bcb9949 100644
--- a/examples/h5_extend_write.c
+++ b/examples/h5_extend_write.c
@@ -1,4 +1,3 @@
-
 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
  * Copyright by the Board of Trustees of the University of Illinois.         *
  * All rights reserved.                                                      *
@@ -46,7 +45,7 @@ main (void)
     hsize_t      maxdims[2] = {H5S_UNLIMITED, H5S_UNLIMITED};
     hsize_t      chunk_dims[2] ={2, 5};
     hsize_t      size[2];
-    hssize_t     offset[2];
+    hsize_t      offset[2];
 
     herr_t      status;                             
 
diff --git a/examples/h5_group.c b/examples/h5_group.c
index f82978d..4e3eac1 100644
--- a/examples/h5_group.c
+++ b/examples/h5_group.c
@@ -1,4 +1,3 @@
-
 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
  * Copyright by the Board of Trustees of the University of Illinois.         *
  * All rights reserved.                                                      *
diff --git a/examples/h5_mount.c b/examples/h5_mount.c
index 0811a09..7075201 100644
--- a/examples/h5_mount.c
+++ b/examples/h5_mount.c
@@ -1,4 +1,3 @@
-
 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
  * Copyright by the Board of Trustees of the University of Illinois.         *
  * All rights reserved.                                                      *
diff --git a/examples/h5_read.c b/examples/h5_read.c
index 213bf47..9d57351 100644
--- a/examples/h5_read.c
+++ b/examples/h5_read.c
@@ -1,4 +1,3 @@
-
 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
  * Copyright by the Board of Trustees of the University of Illinois.         *
  * All rights reserved.                                                      *
@@ -51,9 +50,9 @@ main (void)
     int         data_out[NX][NY][NZ ]; /* output buffer */
    
     hsize_t      count[2];              /* size of the hyperslab in the file */
-    hssize_t     offset[2];             /* hyperslab offset in the file */
+    hsize_t      offset[2];             /* hyperslab offset in the file */
     hsize_t      count_out[3];          /* size of the hyperslab in memory */
-    hssize_t     offset_out[3];         /* hyperslab offset in memory */
+    hsize_t      offset_out[3];         /* hyperslab offset in memory */
     int          i, j, k, status_n, rank;
 
     for (j = 0; j < NX; j++) {
diff --git a/examples/h5_reference.c b/examples/h5_reference.c
index 7e159d1..45f8850 100644
--- a/examples/h5_reference.c
+++ b/examples/h5_reference.c
@@ -1,4 +1,3 @@
-
 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
  * Copyright by the Board of Trustees of the University of Illinois.         *
  * All rights reserved.                                                      *
diff --git a/examples/h5_select.c b/examples/h5_select.c
index 498795c..0c34b1a 100644
--- a/examples/h5_select.c
+++ b/examples/h5_select.c
@@ -1,4 +1,3 @@
-
 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
  * Copyright by the Board of Trustees of the University of Illinois.         *
  * All rights reserved.                                                      *
@@ -67,12 +66,12 @@ main (void)
                                                    read selection from the
                                                    dataset on the disk */
 
-   hssize_t start[2]; /* Start of hyperslab */
+   hsize_t start[2];  /* Start of hyperslab */
    hsize_t stride[2]; /* Stride of hyperslab */
    hsize_t count[2];  /* Block count */
    hsize_t block[2];  /* Block sizes */
 
-   hssize_t coord[NPOINTS][FSPACE_RANK]; /* Array to store selected points 
+   hsize_t coord[NPOINTS][FSPACE_RANK]; /* Array to store selected points 
                                             from the file dataspace */ 
    herr_t ret;
    unsigned i,j;
@@ -171,7 +170,7 @@ main (void)
     coord[3][0] = 5; coord[3][1] = 6;
 
     ret = H5Sselect_elements(fid, H5S_SELECT_SET, NPOINTS, 
-                             (const hssize_t **)coord);
+                             (const hsize_t **)coord);
 
     /*
      * Write new selection of points to the dataset.
diff --git a/examples/h5_write.c b/examples/h5_write.c
index 2c52fa7..8cc4b8f 100644
--- a/examples/h5_write.c
+++ b/examples/h5_write.c
@@ -1,4 +1,3 @@
-
 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
  * Copyright by the Board of Trustees of the University of Illinois.         *
  * All rights reserved.                                                      *
diff --git a/examples/ph5example.c b/examples/ph5example.c
index c79d0ee..b2929ab 100644
--- a/examples/ph5example.c
+++ b/examples/ph5example.c
@@ -1,4 +1,3 @@
-
 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
  * Copyright by the Board of Trustees of the University of Illinois.         *
  * All rights reserved.                                                      *
@@ -96,10 +95,10 @@ int dowrite=1;				/* write test */
 int docleanup=1;			/* cleanup */
 
 /* Prototypes */
-void slab_set(hssize_t start[], hsize_t count[], hsize_t stride[], int mode);
-void dataset_fill(hssize_t start[], hsize_t count[], hsize_t stride[], DATATYPE * dataset);
-void dataset_print(hssize_t start[], hsize_t count[], hsize_t stride[], DATATYPE * dataset);
-int dataset_vrfy(hssize_t start[], hsize_t count[], hsize_t stride[], DATATYPE *dataset, DATATYPE *original);
+void slab_set(hsize_t start[], hsize_t count[], hsize_t stride[], int mode);
+void dataset_fill(hsize_t start[], hsize_t count[], hsize_t stride[], DATATYPE * dataset);
+void dataset_print(hsize_t start[], hsize_t count[], hsize_t stride[], DATATYPE * dataset);
+int dataset_vrfy(hsize_t start[], hsize_t count[], hsize_t stride[], DATATYPE *dataset, DATATYPE *original);
 void phdf5writeInd(char *filename);
 void phdf5readInd(char *filename);
 void phdf5writeAll(char *filename);
@@ -117,7 +116,7 @@ void cleanup(void);
  * Assume dimension rank is 2.
  */
 void
-slab_set(hssize_t start[], hsize_t count[], hsize_t stride[], int mode)
+slab_set(hsize_t start[], hsize_t count[], hsize_t stride[], int mode)
 {
     switch (mode){
     case BYROW:
@@ -157,10 +156,10 @@ slab_set(hssize_t start[], hsize_t count[], hsize_t stride[], int mode)
  * Assume dimension rank is 2 and data is stored contiguous.
  */
 void
-dataset_fill(hssize_t start[], hsize_t count[], hsize_t stride[], DATATYPE * dataset)
+dataset_fill(hsize_t start[], hsize_t count[], hsize_t stride[], DATATYPE * dataset)
 {
     DATATYPE *dataptr = dataset;
-    int i, j;
+    hsize_t i, j;
 
     /* put some trivial data in the data_array */
     for (i=0; i < count[0]; i++){
@@ -174,14 +173,14 @@ dataset_fill(hssize_t start[], hsize_t count[], hsize_t stride[], DATATYPE * dat
 /*
  * Print the content of the dataset.
  */
-void dataset_print(hssize_t start[], hsize_t count[], hsize_t stride[], DATATYPE * dataset)
+void dataset_print(hsize_t start[], hsize_t count[], hsize_t stride[], DATATYPE * dataset)
 {
     DATATYPE *dataptr = dataset;
-    int i, j;
+    hsize_t i, j;
 
     /* print the slab read */
     for (i=0; i < count[0]; i++){
-	printf("Row %d: ", (int)(i*stride[0]+start[0]));
+	printf("Row %lu: ", (unsigned long)(i*stride[0]+start[0]));
 	for (j=0; j < count[1]; j++){
 	    printf("%03d ", *dataptr++);
 	}
@@ -193,11 +192,12 @@ void dataset_print(hssize_t start[], hsize_t count[], hsize_t stride[], DATATYPE
 /*
  * Print the content of the dataset.
  */
-int dataset_vrfy(hssize_t start[], hsize_t count[], hsize_t stride[], DATATYPE *dataset, DATATYPE *original)
+int dataset_vrfy(hsize_t start[], hsize_t count[], hsize_t stride[], DATATYPE *dataset, DATATYPE *original)
 {
 #define MAX_ERR_REPORT	10		/* Maximum number of errors reported */
 
-    int i, j, nerr;
+    hsize_t i, j;
+    int nerr;
 
     /* print it if verbose */
     if (verbose)
@@ -209,9 +209,9 @@ int dataset_vrfy(hssize_t start[], hsize_t count[], hsize_t stride[], DATATYPE *
 	    if (*dataset++ != *original++){
 		nerr++;
 		if (nerr <= MAX_ERR_REPORT){
-		    printf("Dataset Verify failed at [%d][%d](row %d, col %d): expect %d, got %d\n",
-			i, j,
-			(int)(i*stride[0]+start[0]), (int)(j*stride[1]+start[1]),
+		    printf("Dataset Verify failed at [%lu][%lu](row %lu, col %lu): expect %d, got %d\n",
+			(unsigned long)i, (unsigned long)j,
+			(unsigned long)(i*stride[0]+start[0]), (unsigned long)(j*stride[1]+start[1]),
 			*(dataset-1), *(original-1));
 		}
 	    }
@@ -246,7 +246,7 @@ phdf5writeInd(char *filename)
 	{SPACE1_DIM1,SPACE1_DIM2};	/* dataspace dim sizes */
     DATATYPE data_array1[SPACE1_DIM1][SPACE1_DIM2];	/* data buffer */
 
-    hssize_t   start[SPACE1_RANK];			/* for hyperslab setting */
+    hsize_t start[SPACE1_RANK];			/* for hyperslab setting */
     hsize_t count[SPACE1_RANK], stride[SPACE1_RANK];	/* for hyperslab setting */
 
     herr_t ret;         	/* Generic return value */
@@ -311,8 +311,10 @@ phdf5writeInd(char *filename)
     stride[0] = 1;
     stride[1] =1;
 if (verbose)
-    printf("start[]=(%d,%d), count[]=(%d,%d), total datapoints=%d\n",
-	start[0], start[1], count[0], count[1], count[0]*count[1]);
+    printf("start[]=(%lu,%lu), count[]=(%lu,%lu), total datapoints=%lu\n",
+	(unsigned long)start[0], (unsigned long)start[1],
+        (unsigned long)count[0], (unsigned long)count[1],
+        (unsigned long)(count[0]*count[1]));
 
     /* put some trivial data in the data_array */
     dataset_fill(start, count, stride, &data_array1[0][0]);
@@ -373,7 +375,7 @@ phdf5readInd(char *filename)
     DATATYPE data_array1[SPACE1_DIM1][SPACE1_DIM2];	/* data buffer */
     DATATYPE data_origin1[SPACE1_DIM1][SPACE1_DIM2];	/* expected data buffer */
 
-    hssize_t   start[SPACE1_RANK];			/* for hyperslab setting */
+    hsize_t start[SPACE1_RANK];			/* for hyperslab setting */
     hsize_t count[SPACE1_RANK], stride[SPACE1_RANK];	/* for hyperslab setting */
 
     herr_t ret;         	/* Generic return value */
@@ -417,8 +419,10 @@ phdf5readInd(char *filename)
     stride[0] = 1;
     stride[1] =1;
 if (verbose)
-    printf("start[]=(%d,%d), count[]=(%d,%d), total datapoints=%d\n",
-    start[0], start[1], count[0], count[1], count[0]*count[1]);
+    printf("start[]=(%lu,%lu), count[]=(%lu,%lu), total datapoints=%lu\n",
+        (unsigned long)start[0], (unsigned long)start[1],
+        (unsigned long)count[0], (unsigned long)count[1],
+        (unsigned long)(count[0]*count[1]));
 
     /* create a file dataspace independently */
     file_dataspace = H5Dget_space (dataset1);
@@ -489,7 +493,7 @@ phdf5writeAll(char *filename)
 	{SPACE1_DIM1,SPACE1_DIM2};	/* dataspace dim sizes */
     DATATYPE data_array1[SPACE1_DIM1][SPACE1_DIM2];	/* data buffer */
 
-    hssize_t   start[SPACE1_RANK];			/* for hyperslab setting */
+    hsize_t start[SPACE1_RANK];			/* for hyperslab setting */
     hsize_t count[SPACE1_RANK], stride[SPACE1_RANK];	/* for hyperslab setting */
 
     herr_t ret;         	/* Generic return value */
@@ -549,8 +553,10 @@ phdf5writeAll(char *filename)
     /* Dataset1: each process takes a block of rows. */
     slab_set(start, count, stride, BYROW);
 if (verbose)
-    printf("start[]=(%d,%d), count[]=(%d,%d), total datapoints=%d\n",
-	start[0], start[1], count[0], count[1], count[0]*count[1]);
+    printf("start[]=(%lu,%lu), count[]=(%lu,%lu), total datapoints=%lu\n",
+	(unsigned long)start[0], (unsigned long)start[1],
+        (unsigned long)count[0], (unsigned long)count[1],
+        (unsigned long)(count[0]*count[1]));
 
     /* create a file dataspace independently */
     file_dataspace = H5Dget_space (dataset1);				    
@@ -596,8 +602,10 @@ if (verbose)
     /* Dataset2: each process takes a block of columns. */
     slab_set(start, count, stride, BYCOL);
 if (verbose)
-    printf("start[]=(%d,%d), count[]=(%d,%d), total datapoints=%d\n",
-	start[0], start[1], count[0], count[1], count[0]*count[1]);
+    printf("start[]=(%lu,%lu), count[]=(%lu,%lu), total datapoints=%lu\n",
+	(unsigned long)start[0], (unsigned long)start[1],
+        (unsigned long)count[0], (unsigned long)count[1],
+        (unsigned long)(count[0]*count[1]));
 
     /* put some trivial data in the data_array */
     dataset_fill(start, count, stride, &data_array1[0][0]);
@@ -685,7 +693,7 @@ phdf5readAll(char *filename)
     DATATYPE data_array1[SPACE1_DIM1][SPACE1_DIM2];	/* data buffer */
     DATATYPE data_origin1[SPACE1_DIM1][SPACE1_DIM2];	/* expected data buffer */
 
-    hssize_t   start[SPACE1_RANK];			/* for hyperslab setting */
+    hsize_t start[SPACE1_RANK];			/* for hyperslab setting */
     hsize_t count[SPACE1_RANK], stride[SPACE1_RANK];	/* for hyperslab setting */
 
     herr_t ret;         	/* Generic return value */
@@ -738,8 +746,10 @@ phdf5readAll(char *filename)
     /* Dataset1: each process takes a block of columns. */
     slab_set(start, count, stride, BYCOL);
 if (verbose)
-    printf("start[]=(%d,%d), count[]=(%d,%d), total datapoints=%d\n",
-	start[0], start[1], count[0], count[1], count[0]*count[1]);
+    printf("start[]=(%lu,%lu), count[]=(%lu,%lu), total datapoints=%lu\n",
+	(unsigned long)start[0], (unsigned long)start[1],
+        (unsigned long)count[0], (unsigned long)count[1],
+        (unsigned long)(count[0]*count[1]));
 
     /* create a file dataspace independently */
     file_dataspace = H5Dget_space (dataset1);				    
@@ -789,8 +799,10 @@ if (verbose)
     /* Dataset2: each process takes a block of rows. */
     slab_set(start, count, stride, BYROW);
 if (verbose)
-    printf("start[]=(%d,%d), count[]=(%d,%d), total datapoints=%d\n",
-	start[0], start[1], count[0], count[1], count[0]*count[1]);
+    printf("start[]=(%lu,%lu), count[]=(%lu,%lu), total datapoints=%lu\n",
+	(unsigned long)start[0], (unsigned long)start[1],
+        (unsigned long)count[0], (unsigned long)count[1],
+        (unsigned long)(count[0]*count[1]));
 
     /* create a file dataspace independently */
     file_dataspace = H5Dget_space (dataset1);				    
@@ -918,7 +930,7 @@ test_split_comm_access(char filenames[][PATH_MAX])
  * Show command usage
  */
 void
-usage()
+usage(void)
 {
     printf("Usage: testphdf5 [-f <prefix>] [-r] [-w] [-v]\n");
     printf("\t-f\tfile prefix for parallel test files.\n");
@@ -1111,7 +1123,7 @@ finish:
 #else /* H5_HAVE_PARALLEL */
 /* dummy program since H5_HAVE_PARALLE is not configured in */
 int
-main()
+main(void)
 {
 printf("No PHDF5 example because parallel is not configured in\n");
 return(0);