*.mk configuration files modified for compatibility with latest version

of Mentor Sourcery CodeBench Lite toolchain
(https://sourcery.mentor.com/GNUToolchain/release2641).
All detected issues fixed.

src/cmd/as/as.c

@@ -83,6 +83,7 @@ enum {
     LIDENT,             /* .ident */
     LWEAK,              /* .weak */
     LLOCAL,             /* .local */
+    LNAN,               /* .nan */
 };
 
 /*
@@ -731,6 +732,9 @@ int lookacmd ()
     case 'm':
         if (! strcmp (".mask", name)) return (LMASK);
         break;
+    case 'n':
+        if (! strcmp (".nan", name)) return (LNAN);
+        break;
     case 'p':
         if (! strcmp (".previous", name)) return (LPREVIOUS);
         break;
@@ -2212,6 +2216,12 @@ void pass1 ()
                 uerror ("bad parameter of .end");
             cval = lookname();
             break;
+        case LNAN:
+            /* .nan name */
+            clex = getlex (&cval);
+            if (clex != LNAME)
+                uerror ("bad parameter of .nan");
+            break;
         case LTYPE:
             /* .type name,type */
             if (getlex (&cval) != LNAME)
@@ -2661,8 +2671,12 @@ int main (argc, argv)
                     break;
                 case 'I':       /* include dir */
                     // TODO
-                    while (*++cp);
-                    --cp;
+                    if (cp[1] == 0) {
+                        i++;
+                    } else {
+                        while (*++cp);
+                        --cp;
+                    }
                     break;
                 case 'O':       /* optimization level */
                     // TODO

src/cmd/as/mips-instruction-set.txt

@@ -226,7 +226,7 @@ RDHWR       Read Hardware Register                      Allows unprivileged acce
 RDPGPR      Read GPR from Previous Shadow Set           Rt = SGPR[SRSCtl.PSS, Rd]
 
 RESTORE     Restore registers and deallocate stack      See Architecture Reference Manual
-            frame (MIPS16eª only)
+            frame (MIPS16e only)
 
 ROTR        Rotate Word Right                           Rd = Rt[sa-1..0] || Rt[31..sa]
 

src/cmd/basic/basic.c

@@ -1534,7 +1534,7 @@ int get_value()
         value = get_num();
     else {
         ++cmdptr;
-        switch (c) {
+        switch ((int)c) {
         case '(':                       /* nesting */
             value = eval_sub();
             break;