gc: fix build on Plan 9

gc/bits.c
. improved format with associated cast;
gc/closure.c
gc/dcl.c
gc/range.c
gc/reflect.c
gc/sinit.c
. dropped unnecessary assignments;
gc/gen.c
. dropped unnecessary assignment;
. added static qualifier to local function definition;
gc/go.h
. added varargck pragmas;
gc/lex.c
. used {} instead of ; in if statement to suppress warning;
. replaced exit(0) with exits(0);
. added compilation conditions for SIGBUS/SIGSEGV;
. dropped unnecessary assignment;
gc/mparith2.c
. dropped four unnecessary assignments/initialisations;
gc/obj.c
. added type cast to local pointer;
gc/pgen.c
. added cast and related print format;
gc/subr.c
. replaced exit(1) with exits("error");
. replaced unlink() with remove();
. renamed local cistrmp() as ucistrmp() to remove conflict with
  Plan 9 function by the same name;
gc/swt.c
. added braces instead of ; as empty statment;
gc/typecheck.c
. added static qualifier to local function definition;
. dropped unnecessary assignments;
gc/walk.c
. dropped unnecessary assignments;
. added static qualifier to local function definitions;

R=rsc
CC=golang-dev
https://golang.org/cl/4964046

src/cmd/gc/bits.c

@@ -155,7 +155,7 @@ Qconv(Fmt *fp)
 		else {
 			fmtprint(fp, var[i].sym->name);
 			if(var[i].offset != 0)
-				fmtprint(fp, "%+d", var[i].offset);
+				fmtprint(fp, "%+lld", (vlong)var[i].offset);
 		}
 		bits.b[i/32] &= ~(1L << (i%32));
 	}

src/cmd/gc/closure.c

@@ -59,7 +59,6 @@ closurebody(NodeList *body)
 		body = list1(nod(OEMPTY, N, N));
 
 	func = curfn;
-	l = func->dcl;
 	func->nbody = body;
 	funcbody(func);
 

src/cmd/gc/dcl.c

@@ -730,7 +730,6 @@ stotype(NodeList *l, int et, Type **t, int funarg)
 	for(; l; l=l->next) {
 		n = l->n;
 		lineno = n->lineno;
-		note = nil;
 
 		if(n->op != ODCLFIELD)
 			fatal("stotype: oops %N\n", n);
@@ -1141,8 +1140,6 @@ addmethod(Sym *sf, Type *t, int local)
 	Type *f, *d, *pa;
 	Node *n;
 
-	pa = nil;
-
 	// get field sym
 	if(sf == S)
 		fatal("no method symbol");

src/cmd/gc/gen.c

@@ -317,7 +317,6 @@ gen(Node *n)
 	if(n == N)
 		goto ret;
 
-	p3 = pc;	// save pc for loop labels
 	if(n->ninit)
 		genlist(n->ninit);
 
@@ -576,7 +575,7 @@ cgen_callmeth(Node *n, int proc)
 /*
  * generate code to start new proc running call n.
  */
-void
+static void
 cgen_proc(Node *n, int proc)
 {
 	switch(n->left->op) {

src/cmd/gc/go.h

@@ -1308,3 +1308,23 @@ void	zname(Biobuf *b, Sym *s, int t);
 void	data(void);
 void	text(void);
 
+#pragma	varargck	type	"A"	int
+#pragma	varargck	type	"B"	Mpint*
+#pragma	varargck	type	"D"	Addr*
+#pragma	varargck	type	"lD"	Addr*
+#pragma	varargck	type	"E"	int
+#pragma	varargck	type	"F"	Mpflt*
+#pragma	varargck	type	"J"	Node*
+#pragma	varargck	type	"L"	int
+#pragma	varargck	type	"L"	uint
+#pragma	varargck	type	"N"	Node*
+#pragma	varargck	type	"O"	uint
+#pragma	varargck	type	"P"	Prog*
+#pragma	varargck	type	"Q"	Bits
+#pragma	varargck	type	"R"	int
+#pragma	varargck	type	"S"	Sym*
+#pragma	varargck	type	"lS"	Sym*
+#pragma	varargck	type	"T"	Type*
+#pragma	varargck	type	"lT"	Type*
+#pragma	varargck	type	"Y"	char*
+#pragma	varargck	type	"Z"	Strlit*

src/cmd/gc/lex.c

@@ -65,7 +65,7 @@ yy_isalnum(int c)
 #define isalpha use_yy_isalpha_instead_of_isalpha
 #define isalnum use_yy_isalnum_instead_of_isalnum
 
-#define	DBG	if(!debug['x']);else print
+#define	DBG	if(!debug['x']){}else print
 enum
 {
 	EOF		= -1,
@@ -92,7 +92,7 @@ usage(void)
 	print("  -u disable package unsafe\n");
 	print("  -w print the parse tree after typing\n");
 	print("  -x print lex tokens\n");
-	exit(0);
+	exits(0);
 }
 
 void
@@ -115,9 +115,11 @@ main(int argc, char *argv[])
 	int i, c;
 	NodeList *l;
 	char *p;
-	
+
+#ifdef	SIGBUS	
 	signal(SIGBUS, fault);
 	signal(SIGSEGV, fault);
+#endif
 
 	localpkg = mkpkg(strlit(""));
 	localpkg->prefix = "\"\"";
@@ -163,7 +165,7 @@ main(int argc, char *argv[])
 
 	case 'V':
 		print("%cg version %s\n", thechar, getgoversion());
-		exit(0);
+		exits(0);
 	} ARGEND
 
 	if(argc < 1)
@@ -311,7 +313,7 @@ main(int argc, char *argv[])
 		errorexit();
 
 	flusherrors();
-	exit(0);
+	exits(0);
 	return 0;
 }
 
@@ -681,7 +683,6 @@ l0:
 			ep = lexbuf+sizeof lexbuf;
 			*cp++ = c;
 			c = c1;
-			c1 = 0;
 			goto casedot;
 		}
 		if(c1 == '.') {
@@ -1072,7 +1073,6 @@ talph:
 	return s->lexical;
 
 tnum:
-	c1 = 0;
 	cp = lexbuf;
 	ep = lexbuf+sizeof lexbuf;
 	if(c != '0') {

src/cmd/gc/mparith2.c

@@ -351,6 +351,7 @@ mporfixfix(Mpint *a, Mpint *b)
 	int i;
 	long x, *a1, *b1;
 
+	x = 0;
 	if(a->ovf || b->ovf) {
 		yyerror("ovf in mporfixfix");
 		mpmovecfix(a, 0);
@@ -385,6 +386,7 @@ mpandfixfix(Mpint *a, Mpint *b)
 	int i;
 	long x, *a1, *b1;
 
+	x = 0;
 	if(a->ovf || b->ovf) {
 		yyerror("ovf in mpandfixfix");
 		mpmovecfix(a, 0);
@@ -419,6 +421,7 @@ mpandnotfixfix(Mpint *a, Mpint *b)
 	int i;
 	long x, *a1, *b1;
 
+	x = 0;
 	if(a->ovf || b->ovf) {
 		yyerror("ovf in mpandnotfixfix");
 		mpmovecfix(a, 0);
@@ -453,6 +456,7 @@ mpxorfixfix(Mpint *a, Mpint *b)
 	int i;
 	long x, *a1, *b1;
 
+	x = 0;
 	if(a->ovf || b->ovf) {
 		yyerror("ovf in mporfixfix");
 		mpmovecfix(a, 0);

src/cmd/gc/obj.c

@@ -270,7 +270,7 @@ stringsym(char *s, int len)
 		tmp.lit.len = len;
 		memmove(tmp.lit.s, s, len);
 		tmp.lit.s[len] = '\0';
-		snprint(namebuf, sizeof(namebuf), "\"%Z\"", &tmp);
+		snprint(namebuf, sizeof(namebuf), "\"%Z\"", &tmp.lit);
 		pkg = gostringpkg;
 	}
 	sym = pkglookup(namebuf, pkg);

src/cmd/gc/pgen.c

@@ -117,7 +117,7 @@ compile(Node *fn)
 	oldstksize = stksize;
 	compactframe(ptxt);
 	if(0)
-		print("compactframe: %ld to %ld\n", oldstksize, stksize);
+		print("compactframe: %lld to %lld\n", oldstksize, (vlong)stksize);
 
 	defframe(ptxt);
 

src/cmd/gc/range.c

@@ -113,8 +113,6 @@ walkrange(Node *n)
 	}
 
 	v1 = n->list->n;
-	hv1 = N;
-
 	v2 = N;
 	if(n->list->next)
 		v2 = n->list->next->n;

src/cmd/gc/reflect.c

@@ -586,7 +586,6 @@ dcommontype(Sym *s, int ot, Type *t)
 
 	dowidth(t);
 	
-	sptr = nil;
 	if(t->sym != nil && !isptr[t->etype])
 		sptr = dtypesym(ptrto(t));
 	else

src/cmd/gc/sinit.c

@@ -529,6 +529,7 @@ maplit(int ctxt, Node *n, Node *var, NodeList **init)
 	Node *vstat, *index, *value;
 	Sym *syma, *symb;
 
+USED(ctxt);
 ctxt = 0;
 
 	// make the map var
@@ -552,7 +553,6 @@ ctxt = 0;
 			b++;
 	}
 
-	t = T;
 	if(b != 0) {
 		// build type [count]struct { a Tindex, b Tvalue }
 		t = n->type;

src/cmd/gc/subr.c

@@ -29,7 +29,7 @@ errorexit(void)
 	flusherrors();
 	if(outfile)
 		remove(outfile);
-	exit(1);
+	exits("error");
 }
 
 extern int yychar;
@@ -108,7 +108,7 @@ hcrash(void)
 	if(debug['h']) {
 		flusherrors();
 		if(outfile)
-			unlink(outfile);
+			remove(outfile);
 		*(volatile int*)0 = 0;
 	}
 }
@@ -2840,10 +2840,12 @@ setmaxarg(Type *t)
 		maxarg = w;
 }
 
-/* unicode-aware case-insensitive strcmp */
+/*
+ * unicode-aware case-insensitive strcmp
+ */
 
 static int
-cistrcmp(char *p, char *q)
+ucistrcmp(char *p, char *q)
 {
 	Rune rp, rq;
 
@@ -2885,7 +2887,7 @@ lookdot0(Sym *s, Type *t, Type **save, int ignorecase)
 	c = 0;
 	if(u->etype == TSTRUCT || u->etype == TINTER) {
 		for(f=u->type; f!=T; f=f->down)
-			if(f->sym == s || (ignorecase && cistrcmp(f->sym->name, s->name) == 0)) {
+			if(f->sym == s || (ignorecase && ucistrcmp(f->sym->name, s->name) == 0)) {
 				if(save)
 					*save = f;
 				c++;
@@ -2894,7 +2896,7 @@ lookdot0(Sym *s, Type *t, Type **save, int ignorecase)
 	u = methtype(t);
 	if(u != T) {
 		for(f=u->method; f!=T; f=f->down)
-			if(f->embedded == 0 && (f->sym == s || (ignorecase && cistrcmp(f->sym->name, s->name) == 0))) {
+			if(f->embedded == 0 && (f->sym == s || (ignorecase && ucistrcmp(f->sym->name, s->name) == 0))) {
 				if(save)
 					*save = f;
 				c++;

src/cmd/gc/swt.c

@@ -867,9 +867,9 @@ typecheckswitch(Node *n)
 						yyerror("case %+N in %T switch", ll->n, t);
 					break;
 				case Etype:	// type switch
-					if(ll->n->op == OLITERAL && istype(ll->n->type, TNIL))
+					if(ll->n->op == OLITERAL && istype(ll->n->type, TNIL)) {
 						;
-					else if(ll->n->op != OTYPE && ll->n->type != T) {
+					} else if(ll->n->op != OTYPE && ll->n->type != T) {
 						yyerror("%#N is not a type", ll->n);
 						// reset to original type
 						ll->n = n->ntest->right;

src/cmd/gc/typecheck.c

@@ -38,7 +38,7 @@ static	NodeList*	typecheckdefstack;
 /*
  * resolve ONONAME to definition, if any.
  */
-Node*
+static Node*
 resolve(Node *n)
 {
 	Node *r;
@@ -724,7 +724,7 @@ reswitch:
 		}
 		defaultlit(&n->right, t->type);
 		r = n->right;
-		if((t = r->type) == T)
+		if(r->type == T)
 			goto error;
 		r = assignconv(r, l->type->type, "send");
 		// TODO: more aggressive
@@ -1073,7 +1073,7 @@ reswitch:
 			goto error;
 		if((n->op = convertop(t, n->type, &why)) == 0) {
 			yyerror("cannot convert %+N to type %T%s", n->left, n->type, why);
-			op = OCONV;
+			n->op = OCONV;
 		}
 		switch(n->op) {
 		case OCONVNOP:
@@ -2443,7 +2443,7 @@ getforwtype(Node *n)
 {
 	Node *f1, *f2;
 
-	for(f1=f2=n; ; n=n->ntype) {
+	for(f2=n; ; n=n->ntype) {
 		if((n = resolve(n)) == N || n->op != OTYPE)
 			return T;
 

src/cmd/gc/walk.c

@@ -380,14 +380,11 @@ walkexpr(Node **np, NodeList **init)
 		fatal("missed typecheck");
 	}
 
-	t = T;
-	et = Txxx;
-
 	switch(n->op) {
 	default:
 		dump("walk", n);
 		fatal("walkexpr: switch 1 unknown op %N", n);
-		goto ret;
+		break;
 
 	case OTYPE:
 	case ONONAME:
@@ -1364,7 +1361,6 @@ dumptypes(Type **nl, char *what)
 
 	fmtstrinit(&fmt);
 	fmtprint(&fmt, "\t");
-	l = structfirst(&savel, nl);
 	first = 1;
 	for(l = structfirst(&savel, nl); l != T; l = structnext(&savel)) {
 		if(first)
@@ -1745,7 +1741,7 @@ out:
  * then it is done first. otherwise must
  * make temp variables
  */
-NodeList*
+static NodeList*
 reorder1(NodeList *all)
 {
 	Node *f, *a, *n;
@@ -1871,7 +1867,7 @@ vmatch1(Node *l, Node *r)
 	return 0;
 }
 
-NodeList*
+static NodeList*
 reorder3(NodeList *all)
 {
 	Node *n1, *n2, *q;