Make ecpg in line with other compilers in that it deletes its output if there...

Make ecpg in line with other compilers in that it deletes its output if there was an error processing the input file.

Work done by Zoltan.

src/interfaces/ecpg/preproc/ecpg.c

-/* $PostgreSQL: pgsql/src/interfaces/ecpg/preproc/ecpg.c,v 1.114 2010/02/26 02:01:31 momjian Exp $ */
+/* $PostgreSQL: pgsql/src/interfaces/ecpg/preproc/ecpg.c,v 1.115 2010/04/03 19:30:49 meskes Exp $ */
 
 /* Main for ecpg, the PostgreSQL embedded SQL precompiler. */
 /* Copyright (c) 1996-2010, PostgreSQL Global Development Group */
@@ -469,6 +469,14 @@ main(int argc, char *const argv[])
 					fclose(yyin);
 				if (out_option == 0 && yyout != stdout)
 					fclose(yyout);
+				/*
+				 * If there was an error, delete the output file.
+				 */
+				if (ret_value != 0)
+				{
+					if (strcmp(output_filename, "-") != 0 && unlink(output_filename) != 0)
+						fprintf(stderr, _("could not remove output file \"%s\"\n"), output_filename);
+				}
 			}
 
 			if (output_filename && out_option == 0)