re PR rtl-optimization/44752 (insn-automata.c: empty translation unit)

	PR rtl-optimization/44752
	* genautomata.c (main): Don't emit an empty file even if there
	is no automaton.

From-SVN: r162083

gcc/ChangeLog

+2010-07-12  Joern Rennecke  <joern.rennecke@embecosm.com>
+
+	PR rtl-optimization/44752
+	* genautomata.c (main): Don't emit an empty file even if there
+	is no automaton.
+
 2010-07-12  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>
 
 	* config/i386/i386.c (ix86_sol10_return_in_memory): Rename to

gcc/genautomata.c

@@ -9568,6 +9568,16 @@ main (int argc, char **argv)
 	  write_automata ();
 	}
     }
+  else
+    {
+      puts ("/* Generated automatically by the program `genautomata'\n"
+	    "   from the machine description file `md'.  */\n\n"
+	    "/* There is no automaton, but ISO C forbids empty\n"
+	    "   translation units, so include a header file with some\n"
+	    "   declarations, and the its pre-requisite header file.  */\n"
+	    "#include \"config.h\"\n"
+	    "#include \"system.h\"\n");
+    }
 
   fflush (stdout);
   return (ferror (stdout) != 0 || have_error