Use diff rather than cmp if possible. Also if possible do a unified diff

and for M$DOG strip whitespace for the \r\n vs \n differences.

configure.ac

@@ -15,7 +15,7 @@ dnl along with this program; if not, write to the Free Software
 dnl Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
 dnl 02111-1307, USA.
 
-AC_REVISION([$Id: configure.ac,v 1.25 2003/06/07 08:53:16 rocky Exp $])dnl
+AC_REVISION([$Id: configure.ac,v 1.26 2003/06/08 12:33:37 rocky Exp $])dnl
 AC_INIT(lib/cdio.c)
 AM_CONFIG_HEADER(config.h)
 AM_INIT_AUTOMAKE(libcdio, 0.61)
@@ -57,6 +57,9 @@ fi
 dnl We use a perl for documentation and regression tests
 AC_PATH_PROG(PERL, perl, no)
 AC_SUBST(PERL)dnl
+AC_PATH_PROGS(DIFF, diff, cmp)
+AC_SUBST(DIFF)dnl
+
 
 AM_PATH_LIBPOPT(, [enable_cdinfo=no])
 
@@ -268,6 +271,7 @@ AC_OUTPUT([ \
        src/Makefile \
        test/check_nrg.sh \
        test/check_cue.sh \
+       test/check_common_fn \
        test/Makefile \
        ])
 

test/check_common_fn.in

@@ -1,18 +1,24 @@
-# $Id: check_common_fn,v 1.4 2003/06/07 20:41:21 rocky Exp $
+# $Id: check_common_fn.in,v 1.1 2003/06/08 12:33:38 rocky Exp $
 SKIP_TEST_EXITCODE=77
-
-have_cmp() {
-  if cmp /dev/null /dev/null > /dev/null 2>&1; then
+DIFF_OPTS=
+have_diff() {
+  if @DIFF@ ./Makefile ./Makefile > /dev/null 2>&1; then
     :
   else
     
     return 1;
   fi
   
-  if cmp /dev/zero /dev/null > /dev/null 2>&1; then
+  if @DIFF@ ./Makefile ./check_common_fn.in > /dev/null 2>&1; then
     return 1;
   fi
-  
+
+  # MSDOG output uses \r\n rather than \n in tests
+  for diff_opt in -w --unified ; do 
+    if @DIFF@ $opt ./Makefile ./Makefile > /dev/null 2>&1; then
+      DIFF_OPTS="$DIFF_OPTS $diff_opt"
+    fi
+  done
   return 0;
 }
 
@@ -46,15 +52,15 @@ test_cdinfo() {
   fi
 
   if ${CDINFO} --no-header ${opts} >${outfile} 2>&1 ; then 
-    if have_cmp; then
-      if cmp ${outfile} ${rightfile} ; then
+    if have_diff; then
+      if @DIFF@ ${outfile} ${rightfile} ; then
 	rm -f $outfile
 	return 0
       else
 	return 3
       fi
     else
-      echo "$0: No cmp(1) found - cannot test cdinfo"
+      echo "$0: No diff(1) or cmp(1 found - cannot test ${CDINFO}"
       rm -f $outfile
       return 77
     fi