cmd/link: bump object file version number

The format has been tweaked several times in the latest cycle, so
replace go13ld with go17ld.

Change-Id: I343c49b02b7516fd781bc96ad46640579da68c59
Reviewed-on: https://go-review.googlesource.com/22708Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

src/cmd/internal/goobj/read.go

@@ -580,7 +580,7 @@ func (r *objReader) parseObject(prefix []byte) error {
 	}
 
 	r.readFull(r.tmp[:8])
-	if !bytes.Equal(r.tmp[:8], []byte("\x00\x00go13ld")) {
+	if !bytes.Equal(r.tmp[:8], []byte("\x00\x00go17ld")) {
 		return r.error(errCorruptObject)
 	}
 
@@ -687,7 +687,7 @@ func (r *objReader) parseObject(prefix []byte) error {
 	}
 
 	r.readFull(r.tmp[:7])
-	if !bytes.Equal(r.tmp[:7], []byte("\xffgo13ld")) {
+	if !bytes.Equal(r.tmp[:7], []byte("\xffgo17ld")) {
 		return r.error(errCorruptObject)
 	}
 

src/cmd/internal/obj/objfile.go

@@ -15,7 +15,7 @@
 //
 // The file format is:
 //
-//	- magic header: "\x00\x00go13ld"
+//	- magic header: "\x00\x00go17ld"
 //	- byte 1 - version number
 //	- sequence of strings giving dependencies (imported packages)
 //	- empty string (marks end of sequence)
@@ -31,7 +31,7 @@
 //	- data, the content of the defined symbols
 //	- sequence of defined symbols
 //	- byte 0xff (marks end of sequence)
-//	- magic footer: "\xff\xffgo13ld"
+//	- magic footer: "\xff\xffgo17ld"
 //
 // All integers are stored in a zigzag varint format.
 // See golang.org/s/go12symtab for a definition.
@@ -199,7 +199,7 @@ func WriteObjFile(ctxt *Link, b *bufio.Writer) {
 	w := newObjWriter(ctxt, b)
 
 	// Magic header
-	w.wr.WriteString("\x00\x00go13ld")
+	w.wr.WriteString("\x00\x00go17ld")
 
 	// Version
 	w.wr.WriteByte(1)
@@ -249,7 +249,7 @@ func WriteObjFile(ctxt *Link, b *bufio.Writer) {
 	}
 
 	// Magic footer
-	w.wr.WriteString("\xff\xffgo13ld")
+	w.wr.WriteString("\xff\xffgo17ld")
 }
 
 // Symbols are prefixed so their content doesn't get confused with the magic footer.

src/cmd/link/internal/ld/objfile.go

@@ -17,7 +17,7 @@ package ld
 //
 // The file format is:
 //
-//	- magic header: "\x00\x00go13ld"
+//	- magic header: "\x00\x00go17ld"
 //	- byte 1 - version number
 //	- sequence of strings giving dependencies (imported packages)
 //	- empty string (marks end of sequence)
@@ -33,7 +33,7 @@ package ld
 //	- data, the content of the defined symbols
 //	- sequence of defined symbols
 //	- byte 0xff (marks end of sequence)
-//	- magic footer: "\xff\xffgo13ld"
+//	- magic footer: "\xff\xffgo17ld"
 //
 // All integers are stored in a zigzag varint format.
 // See golang.org/s/go12symtab for a definition.
@@ -121,8 +121,8 @@ import (
 )
 
 const (
-	startmagic = "\x00\x00go13ld"
-	endmagic   = "\xff\xffgo13ld"
+	startmagic = "\x00\x00go17ld"
+	endmagic   = "\xff\xffgo17ld"
 )
 
 var emptyPkg = []byte(`"".`)