mescc: Accept -O, --std, -x.

* scripts/mescc.in (parse-opts): Accept -O, --std, -x.

scripts/mescc.in

@@ -85,11 +85,14 @@ fi
             (library (single-char #\l) (value #t))
             (machine (single-char #\m) (value #t))
             (preprocess (single-char #\E))
+            (std (value #t))
             (output (single-char #\o) (value #t))
+            (optimize (single-char #\O) (value #t))
             (version (single-char #\V))
             (verbose (single-char #\v))
-            (write (single-char #\w) (value #t))))
-         (single-dash-options '("-dumpmachine"))
+            (write (single-char #\w) (value #t))
+            (language (single-char #\x) (value #t))))
+         (single-dash-options '("-dumpmachine" "-std"))
          (args (map (lambda (o)
                       (if (member o single-dash-options) (string-append "-" o)
                           o))
@@ -108,7 +111,6 @@ fi
                 (format (or (and usage? (current-error-port)) (current-output-port)) "\
 Usage: mescc [OPTION]... FILE...
   --align             align globals
-  -c                 preprocess, compile and assemble only; do not link
   -dumpmachine        display the compiler's target processor
   --base-address=ADRRESS
                       use BaseAddress ADDRESS [0x1000000]
@@ -121,9 +123,12 @@ Usage: mescc [OPTION]... FILE...
   -l LIBNAME          link with LIBNAME
   -m BITS             compile for BITS bits [32]
   -o FILE             write output to FILE
+  -O LEVEL            use optimizing LEVEL
   -S                  preprocess and compile only; do not assemble or link
+      --std=STANDARD  assume that the input sources are for STANDARD
   -v, --version       display version and exit
   -w,--write=TYPE     dump Nyacc AST using TYPE {pretty-print,write}
+  -x LANGUAGE         specify LANGUAGE of the following input files
 
 Environment variables: