code review 4406042: build: use gcc -Werror

src/cmd/5c/txt.c

 // Inferno utils/5c/txt.c
 // http://code.google.com/p/inferno-os/source/browse/utils/5c/txt.c
 //
 //      Copyright © 1994-1999 Lucent Technologies Inc.  All rights reserved.
 //      Portions Copyright © 1995-1997 C H Forsyth (forsyth@terzarima.net)
 //      Portions Copyright © 1997-1999 Vita Nuova Limited
 //      Portions Copyright © 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com)
 //      Portions Copyright © 2004,2006 Bruce Ellis
 //      Portions Copyright © 2005-2007 C H Forsyth (forsyth@terzarima.net)
 //      Revisions Copyright © 2000-2007 Lucent Technologies Inc. and others
@@ skipping 382 matching lines @@
         *n = *nodsafe;
         n->xoffset = -(stkoff + cursafe);
         n->type = nn->type;
         n->etype = nn->type->etype;
         n->lineno = nn->lineno;
 }
 
 void
 regaalloc1(Node *n, Node *nn)
 {
+        if(REGARG < 0) {
+                fatal(n, "regaalloc1 and REGARG<0");
+                return;
+        }
         nodreg(n, nn, REGARG);
         reg[REGARG]++;
         curarg = align(curarg, nn->type, Aarg1, nil);
         curarg = align(curarg, nn->type, Aarg2, nil);
         maxargsafe = maxround(maxargsafe, cursafe+curarg);
 }
 
 void
 regaalloc(Node *n, Node *nn)
 {
@@ skipping 890 matching lines @@
         BFLOAT,                         /* [TFLOAT] */
         BDOUBLE,                        /* [TDOUBLE] */
         BLONG|BULONG|BIND,              /* [TIND] */
         0,                              /* [TFUNC] */
         0,                              /* [TARRAY] */
         0,                              /* [TVOID] */
         BSTRUCT,                        /* [TSTRUCT] */
         BUNION,                         /* [TUNION] */
         0,                              /* [TENUM] */
 };