diff --git a/src/cmd/6g/reg.c b/src/cmd/6g/reg.c
index f5600f6827c..320600b3577 100644
--- a/src/cmd/6g/reg.c
+++ b/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++;
 
diff --git a/src/cmd/gc/pgen.c b/src/cmd/gc/pgen.c
index 87225a4f88d..2a8a7797500 100644
--- a/src/cmd/gc/pgen.c
+++ b/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)) {
diff --git a/src/cmd/gc/plive.c b/src/cmd/gc/plive.c
index 25d6e89b98b..fd2888e4d20 100644
--- a/src/cmd/gc/plive.c
+++ b/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");
 }
 
diff --git a/src/cmd/gc/walk.c b/src/cmd/gc/walk.c
index d28495d0b7a..e1a909ce693 100644
--- a/src/cmd/gc/walk.c
+++ b/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);
diff --git a/src/cmd/ld/data.c b/src/cmd/ld/data.c
index db01463930d..0e3854fb57b 100644
--- a/src/cmd/ld/data.c
+++ b/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;
 			}
diff --git a/src/cmd/ld/dwarf.c b/src/cmd/ld/dwarf.c
index c4f6b9d016e..dd8a3d76066 100644
--- a/src/cmd/ld/dwarf.c
+++ b/src/cmd/ld/dwarf.c
@@ -1514,7 +1514,6 @@ writelines(void)
 
 	unitstart = -1;
 	headerend = -1;
-	pc = 0;
 	epc = 0;
 	epcs = S;
 	lineo = cpos();
diff --git a/src/cmd/ld/elf.c b/src/cmd/ld/elf.c
index 8c7ca860978..3b8bfb00570 100644
--- a/src/cmd/ld/elf.c
+++ b/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);
 }
diff --git a/src/cmd/ld/ldmacho.c b/src/cmd/ld/ldmacho.c
index 7318381e35e..14db8112776 100644
--- a/src/cmd/ld/ldmacho.c
+++ b/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);