main: fix error message for missing argument

* src/getargs.c (getargs): Don't display any argv other that argv[0]
when reporting a missing argument.
* tests/bison.in: Neutralize path differences in stderr.
* tests/input.at (Invalid number of arguments): New.

src/getargs.c

@@ -724,7 +724,7 @@ getargs (int argc, char *argv[])
   if (argc - optind != 1)
     {
       if (argc - optind < 1)
-        error (0, 0, _("%s: missing operand"), quotearg_colon (argv[argc - 1]));
+        error (0, 0, _("missing operand"));
       else
         error (0, 0, _("extra operand %s"), quote (argv[optind + 1]));
       usage (EXIT_FAILURE);

tests/bison.in

@@ -25,9 +25,15 @@ abs_top_builddir='@abs_top_builddir@'
 BISON_PKGDATADIR=$abs_top_srcdir/data
 export BISON_PKGDATADIR
 
-$PREBISON "$abs_top_builddir/src/bison" ${1+"$@"}
+stderr=tmp-bison.$$
+$PREBISON "$abs_top_builddir/src/bison" ${1+"$@"} 2>"$stderr"
 status=$?
 
+# Neutralize path differences in error messages so that check and
+# installcheck behave the same way.
+sed -e "s,$abs_top_builddir/src/,,g" <"$stderr" >&2
+rm -f "$stderr"
+
 # As a special dark magic, if we are actually using this wrapper to
 # compile Bison's src/parse-gram.y, post-process the synclines to
 # avoid dependencies on the user's set up (srcdir vs. builddir).

tests/input.at

@@ -20,6 +20,31 @@ AT_BANNER([[Input Processing.]])
 # Mostly test that we are robust to mistakes.
 
 
+## ----------------------------- ##
+## Invalid number of arguments.  ##
+## ----------------------------- ##
+
+AT_SETUP([Invalid number of arguments])
+
+AT_BISON_CHECK([], [1], [],
+[[bison: missing operand
+Try 'bison --help' for more information.
+]])
+
+AT_BISON_CHECK([1.y 2.y], [1], [],
+[[bison: extra operand '2.y'
+Try 'bison --help' for more information.
+]])
+
+AT_BISON_CHECK([--skeleton], [1], [],
+[[bison: option '--skeleton' requires an argument
+Try 'bison --help' for more information.
+]])
+
+AT_CLEANUP
+
+
+
 ## ----------------- ##
 ## Invalid options.  ##
 ## ----------------- ##