Output errno on error (helps debugging)

Author: ddeclerck

cobc/gentable.c

@@ -87,8 +87,9 @@ gentable (FILE *stream, const char *code_ebcdic, const char *code_ascii, char re
 					--ascii_size;
 					++nb_irreversible;
 				} else {
-					cb_error (_("an error occurred after converting %ld characters"),
-							(ebcdic_ptr - ebcdic));
+					cb_error (_("an error occurred after converting %ld characters (%d, %ld)"),
+							(ebcdic_ptr - ebcdic),
+							errno, res);
 					iconv_close (ic);
 					return -1;
 				}