ld: fix build on Plan 9

ld/data.c:
. Format specifier with corresponding cast to cater for all
  architectures (llux and vlong).

ld/ldelf.c:
ld/ldmacho.c:
. Missing "pn" argument in diag() calls.

ld/ldpe.c:
. Dropped "sym->sectnum" in diag() call.
. Typo in a comment.

ld/lib.h:
. Added varargck pragma for "O".

R=rsc
CC=golang-dev
https://golang.org/cl/4749042

src/cmd/ld/data.c

@@ -512,7 +512,7 @@ codeblk(int32 addr, int32 size)
 				epc = p->link->pc;
 			else
 				epc = sym->value + sym->size;
-			Bprint(&bso, "%.6ux\t", p->pc);
+			Bprint(&bso, "%.6llux\t", (uvlong)p->pc);
 			q = sym->p + p->pc - sym->value;
 			n = epc - p->pc;
 			Bprint(&bso, "%-20.*I | %P\n", (int)n, q, p);

src/cmd/ld/ldelf.c

@@ -398,13 +398,13 @@ ldelf(Biobuf *f, char *pkg, int64 len, char *pn)
 		goto bad;
 
 	if(e->e16(hdr->type) != ElfTypeRelocatable) {
-		diag("%s: elf but not elf relocatable object");
+		diag("%s: elf but not elf relocatable object", pn);
 		return;
 	}
 
 	switch(thechar) {
 	default:
-		diag("%s: elf %s unimplemented", thestring);
+		diag("%s: elf %s unimplemented", pn, thestring);
 		return;
 	case '5':
 		if(e != &le || obj->machine != ElfMachArm || hdr->ident[4] != ElfClass32) {

src/cmd/ld/ldmacho.c

@@ -480,7 +480,7 @@ ldmacho(Biobuf *f, char *pkg, int64 len, char *pn)
 	
 	switch(thechar) {
 	default:
-		diag("%s: mach-o %s unimplemented", thestring);
+		diag("%s: mach-o %s unimplemented", pn, thestring);
 		return;
 	case '6':
 		if(e != &le || m->cputype != MachoCpuAmd64) {

src/cmd/ld/ldpe.c

@@ -338,7 +338,7 @@ ldpe(Biobuf *f, char *pkg, int64 len, char *pn)
 			if(sect->sym == 0)
 				diag("%s: %s sym == 0!", pn, s->name);
 		} else {
-			diag("%s: %s sectnum <0!", pn, s->name, sym->sectnum);
+			diag("%s: %s sectnum < 0!", pn, s->name);
 		}
 
 		if(sect == nil) 
@@ -383,7 +383,7 @@ map(PeObj *obj, PeSect *sect)
 		return 0;
 
 	sect->base = mal(sect->sh.SizeOfRawData);
-	if(sect->sh.PointerToRawData == 0) // .bss don't has data in object file.
+	if(sect->sh.PointerToRawData == 0) // .bss doesn't have data in object file
 		return 0;
 	werrstr("short read");
 	if(Bseek(obj->f, obj->base+sect->sh.PointerToRawData, 0) < 0 || 

src/cmd/ld/lib.h

@@ -277,6 +277,8 @@ extern	Header	headers[];
 int	headtype(char*);
 
 int	Yconv(Fmt*);
+
+#pragma	varargck	type	"O"	int
 #pragma	varargck	type	"Y"	Sym*
 
 // buffered output