ECC-1322: grib_compare: Option '-e' generates dubious error message

tests/CMakeLists.txt

@@ -90,6 +90,7 @@ if( HAVE_BUILD_TOOLS )
         grib_ecc-1260
         grib_ecc-1261
         grib_ecc-1271
+        grib_ecc-1322
         grib_ecc-1319
         bufr_ecc-1028
         bufr_ecc-1195

tests/grib_ecc-1322.sh

@@ -0,0 +1,28 @@
+#!/bin/sh
+# (C) Copyright 2005- ECMWF.
+#
+# This software is licensed under the terms of the Apache Licence Version 2.0
+# which can be obtained at http://www.apache.org/licenses/LICENSE-2.0.
+# 
+# In applying this licence, ECMWF does not waive the privileges and immunities granted to it by
+# virtue of its status as an intergovernmental organisation nor does it submit to any jurisdiction.
+#
+
+. ./include.sh
+set -u
+REDIRECT=/dev/null
+label="grib_ecc-1322_test"
+
+tempGrb=temp.$label.grib
+tempOut=temp.$label.out
+tempRef=temp.$label.ref
+
+sample_grib1=$ECCODES_SAMPLES_PATH/GRIB1.tmpl
+
+${tools_dir}/grib_set -s edition=2 $sample_grib1 $tempGrb
+${tools_dir}/grib_compare -e -b param $sample_grib1 $tempGrb > $tempOut 2>&1
+
+[ ! -s "$tempOut" ]
+
+# Clean up
+rm -f $tempGrb $tempOut $tempRef

tools/grib_compare.c

@@ -82,7 +82,8 @@ static int onlyListed          = 1;
 static int headerMode          = 0;
 static int morein1             = 0;
 static int morein2             = 0;
-static int listFromCommandLine;
+static int listFromCommandLine = 0;
+static int editionIndependent  = 0;
 static int verbose             = 0;
 static double tolerance_factor = 1;
 
@@ -216,6 +217,9 @@ int grib_tool_init(grib_runtime_options* options)
     if (grib_options_on("c:") || grib_options_on("e"))
         listFromCommandLine = 1;
 
+    if (grib_options_on("e"))
+        editionIndependent = 1;
+
     if (grib_options_on("a"))
         onlyListed = 0;
     else
@@ -1194,7 +1198,7 @@ static int compare_handles(grib_handle* h1, grib_handle* h2, grib_runtime_option
                         err++;
                 }
                 grib_keys_iterator_delete(iter);
-                if (num_keys_in_namespace == 0) {
+                if (num_keys_in_namespace == 0 && !editionIndependent) {
                     printf("ERROR: namespace \"%s\" does not contain any key.\n", options->compare[i].name);
                 }
             }