cmd/6g, cmd/gc, cmd/ld: fix Plan 9 amd64 warnings

warning: src/cmd/6g/reg.c:671 format mismatch d VLONG, arg 4
warning: src/cmd/gc/pgen.c:230 set and not used: oldstksize
warning: src/cmd/gc/plive.c:877 format mismatch lx UVLONG, arg 2
warning: src/cmd/gc/walk.c:2878 set and not used: cbv
warning: src/cmd/gc/walk.c:2885 set and not used: hbv
warning: src/cmd/ld/data.c:198 format mismatch s IND FUNC(IND CHAR) INT, arg 2
warning: src/cmd/ld/data.c:230 format mismatch s IND FUNC(IND CHAR) INT, arg 2
warning: src/cmd/ld/dwarf.c:1517 set and not used: pc
warning: src/cmd/ld/elf.c:1507 format mismatch d VLONG, arg 2
warning: src/cmd/ld/ldmacho.c:509 set and not used: dsymtab

R=golang-dev, gobot, rsc
CC=golang-dev
https://golang.org/cl/36740045

src/cmd/6g/reg.c

@@ -668,7 +668,7 @@ mkvar(Reg *r, Adr *a)
 	v->node = node;
 
 	if(debug['R'])
-		print("bit=%2d et=%2E w=%d+%lld %#N %D flag=%d\n", i, et, o, w, node, a, v->addr);
+		print("bit=%2d et=%2E w=%lld+%lld %#N %D flag=%d\n", i, et, o, w, node, a, v->addr);
 
 	ostats.nvar++;
 

src/cmd/gc/pgen.c

@@ -232,6 +232,7 @@ compile(Node *fn)
 
 	if(0)
 		print("allocauto: %lld to %lld\n", oldstksize, (vlong)stksize);
+	USED(oldstksize);
 
 	setlineno(curfn);
 	if((int64)stksize+maxarg > (1ULL<<31)) {

src/cmd/gc/plive.c

@@ -874,7 +874,7 @@ checkauto(Node *fn, Prog *p, Node *n, char *where)
 	print("D_AUTO '%s' not found: name is '%s' function is '%s' class is %d\n", where, nname, fnname, n->class);
 	print("Here '%P'\nlooking for node %p\n", p, n);
 	for(ll = fn->dcl; ll != nil; ll = ll->next)
-		print("node=%lx, node->class=%d\n", (uintptr)ll->n, ll->n->class);
+		print("node=%p, node->class=%d\n", (uintptr)ll->n, ll->n->class);
 	yyerror("checkauto: invariant lost");
 }
 

src/cmd/gc/walk.c

@@ -2886,17 +2886,13 @@ sliceany(Node* n, NodeList **init)
 
 	if(isconst(cb, CTINT)) {
 		cbv = mpgetfix(cb->val.u.xval);
-		if(cbv < 0 || cbv > bv) {
+		if(cbv < 0 || cbv > bv)
 			yyerror("slice index out of bounds");
-			cbv = -1;
-		}
 	}
 	if(isconst(hb, CTINT)) {
 		hbv = mpgetfix(hb->val.u.xval);
-		if(hbv < 0 || hbv > bv) {
+		if(hbv < 0 || hbv > bv)
 			yyerror("slice index out of bounds");
-			hbv = -1;
-		}
 	}
 	if(isconst(lb, CTINT)) {
 		lbv = mpgetfix(lb->val.u.xval);

src/cmd/ld/data.c

@@ -195,7 +195,7 @@ relocsym(LSym *s)
 					if(rs->type != SHOSTOBJ)
 						o += symaddr(rs);
 				} else {
-					diag("unhandled pcrel relocation for %s", headtype);
+					diag("unhandled pcrel relocation for %s", headstring);
 				}
 				break;
 			}
@@ -227,7 +227,7 @@ relocsym(LSym *s)
 						o += symaddr(rs) - rs->sect->vaddr;
 					o -= r->off; // WTF?
 				} else {
-					diag("unhandled pcrel relocation for %s", headtype);
+					diag("unhandled pcrel relocation for %s", headstring);
 				}
 				break;
 			}

src/cmd/ld/dwarf.c

@@ -1514,7 +1514,6 @@ writelines(void)
 
 	unitstart = -1;
 	headerend = -1;
-	pc = 0;
 	epc = 0;
 	epcs = S;
 	lineo = cpos();

src/cmd/ld/elf.c

@@ -1504,5 +1504,5 @@ elfobj:
 			a += elfwritebuildinfo();
 	}
 	if(a > ELFRESERVE)	
-		diag("ELFRESERVE too small: %d > %d", a, ELFRESERVE);
+		diag("ELFRESERVE too small: %lld > %d", a, ELFRESERVE);
 }

src/cmd/ld/ldmacho.c

@@ -507,6 +507,7 @@ ldmacho(Biobuf *f, char *pkg, int64 len, char *pn)
 	c = nil;
 	symtab = nil;
 	dsymtab = nil;
+	USED(dsymtab);
 	for(i=0; i<ncmd; i++){
 		ty = e->e32(cmdp);
 		sz = e->e32(cmdp+4);