clean up warnings in darshan runtime

- nothing important here, just cutting down noise

darshan-runtime/lib/darshan-core.c

@@ -1083,13 +1083,17 @@ static void darshan_get_exe_and_mounts(struct darshan_core_runtime *core,
         if(fh) {
             ii = 0;
             s = fgets(cmdl,DARSHAN_EXE_LEN,fh);
-            for(i=1;i<DARSHAN_EXE_LEN;i++)  {
-                if(cmdl[i]==0 && ii == 0) {
-                  cmdl[i]=' '; ii = 1;
-                } else if(cmdl[i]==0 && ii == 1) {
-                  break;
-                } else {
-                  ii = 0;
+            if(!s)
+                sprintf(cmdl, "%s <unknown args>", __progname_full);
+            else {
+                for(i=1;i<DARSHAN_EXE_LEN;i++)  {
+                    if(cmdl[i]==0 && ii == 0) {
+                      cmdl[i]=' '; ii = 1;
+                    } else if(cmdl[i]==0 && ii == 1) {
+                      break;
+                    } else {
+                      ii = 0;
+                    }
                 }
             }
             fclose(fh);

darshan-runtime/lib/darshan-dxt.c

@@ -280,9 +280,6 @@ void dxt_posix_runtime_initialize()
 #endif
     .mod_shutdown_func = &dxt_posix_shutdown
     };
-    int ret;
-    double tmpfloat;
-    char *envstr;
 
     /* determine whether tracing should be generally disabled/enabled */
     if(getenv("DXT_ENABLE_IO_TRACE"))
@@ -348,9 +345,6 @@ void dxt_mpiio_runtime_initialize()
 #endif
     .mod_shutdown_func = &dxt_mpiio_shutdown
     };
-    int ret;
-    double tmpfloat;
-    char *envstr;
 
     /* determine whether tracing should be generally disabled/enabled */
     if(getenv("DXT_ENABLE_IO_TRACE"))

darshan-runtime/lib/darshan-posix.c

@@ -247,7 +247,7 @@ static int darshan_mem_alignment = 1;
 
 #define POSIX_RECORD_READ(__ret, __fd, __pread_flag, __pread_offset, __aligned, __tm1, __tm2) do { \
     struct posix_file_record_ref* rec_ref; \
-    size_t stride; \
+    int64_t stride; \
     int64_t this_offset; \
     int64_t file_alignment; \
     struct darshan_common_val_counter *cvc; \
@@ -310,7 +310,7 @@ static int darshan_mem_alignment = 1;
 
 #define POSIX_RECORD_WRITE(__ret, __fd, __pwrite_flag, __pwrite_offset, __aligned, __tm1, __tm2) do { \
     struct posix_file_record_ref* rec_ref; \
-    size_t stride; \
+    int64_t stride; \
     int64_t this_offset; \
     int64_t file_alignment; \
     struct darshan_common_val_counter *cvc; \

darshan-util/darshan-hdf5-logutils.c

@@ -224,14 +224,18 @@ static int darshan_log_get_hdf5_dataset(darshan_fd fd, void** hdf5_buf_p)
     {
         fprintf(stderr, "Error: Invalid H5D module version number (got %d)\n",
             fd->mod_ver[DARSHAN_H5D_MOD]);
-        return(-1);
+        ret = -1;
+        goto exit;
     }
 
     if(*hdf5_buf_p == NULL)
     {
         ds = malloc(sizeof(*ds));
         if(!ds)
-            return(-1);
+        {
+            ret = -1;
+            goto exit;
+        }
     }
 
     if(fd->mod_ver[DARSHAN_H5D_MOD] == DARSHAN_H5D_VER)

darshan-util/darshan-logutils.c

@@ -2097,7 +2097,6 @@ void darshan_log_get_name_records(darshan_fd fd,
 {
     int ret;
     struct darshan_name_record_ref *name_hash = NULL;
-    struct darshan_name_record_ref *ref = NULL;
     struct darshan_name_record_ref *tmp = NULL;
     struct darshan_name_record_ref *curr = NULL;
 
@@ -2140,7 +2139,6 @@ void darshan_log_get_filtered_name_records(darshan_fd fd,
 
     int ret;
     struct darshan_name_record_ref *name_hash = NULL;
-    struct darshan_name_record_ref *ref = NULL;
     struct darshan_name_record_ref *tmp = NULL;
     struct darshan_name_record_ref *curr = NULL;