cmd/internal/goobj: make mkbuiltin.go automatically update Magic const

Fixes #69928 Change-Id: Icf4f800be496eabcdb0cce44374cb67a8c948a95
golang · Nov 13, 2024 · 9c2b679 · 9c2b679
1 parent c759ea7
commit 9c2b679
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Showing 3 changed files with 9 additions and 2 deletions.
diff --git a/src/cmd/internal/goobj/builtinlist.go b/src/cmd/internal/goobj/builtinlist.go
diff --git a/src/cmd/internal/goobj/mkbuiltin.go b/src/cmd/internal/goobj/mkbuiltin.go
@@ -16,6 +16,7 @@ import (
 	"go/format"
 	"go/parser"
 	"go/token"
+	"internal/goversion"
 	"io"
 	"log"
 	"os"
@@ -33,6 +34,7 @@ func main() {
 	fmt.Fprintln(&b)
 	fmt.Fprintln(&b, "package goobj")
 
+	mkmagic(&b)
 	mkbuiltin(&b)
 
 	out, err := format.Source(b.Bytes())
@@ -49,6 +51,11 @@ func main() {
 	}
 }
 
+func mkmagic(w io.Writer) {
+	version := fmt.Sprintf("go1%d", goversion.Version)
+	fmt.Fprintln(w, fmt.Sprintf(`const Magic = "\x00%sld"`, version))
+}
+
 func mkbuiltin(w io.Writer) {
 	pkg := "runtime"
 	fset := token.NewFileSet()

diff --git a/src/cmd/internal/goobj/objfile.go b/src/cmd/internal/goobj/objfile.go
@@ -214,8 +214,6 @@ type Header struct {
 	Offsets     [NBlk]uint32
 }
 
-const Magic = "\x00go120ld"
-
 func (h *Header) Write(w *Writer) {
 	w.RawString(h.Magic)
 	w.Bytes(h.Fingerprint[:])