Added segment flags for the read-only segment in Mach-O

src/macho/MachO.go

@@ -71,7 +71,7 @@ func Write(writer io.WriteSeeker, b *build.Build, codeBytes []byte, dataBytes []
 			Size:        uint64(len(code.Bytes)),
 			Offset:      uint32(code.FileOffset),
 			Align:       6,
-			Flags:       FlagPureInstructions,
+			Flags:       SectionPureInstructions,
 		},
 		DataSegment: Segment64{
 			LoadCommand:  LcSegment64,
@@ -82,7 +82,7 @@ func Write(writer io.WriteSeeker, b *build.Build, codeBytes []byte, dataBytes []
 			Offset:       uint64(data.FileOffset),
 			SizeInFile:   uint64(len(data.Bytes)),
 			NumSections:  0,
-			Flag:         0,
+			Flag:         SegmentReadOnly,
 			MaxProt:      ProtReadable,
 			InitProt:     ProtReadable,
 		},

src/macho/SectionFlags.go

@@ -3,5 +3,5 @@ package macho
 type SectionFlags uint32
 
 const (
-	FlagPureInstructions SectionFlags = 0x80000000
+	SectionPureInstructions SectionFlags = 0x80000000
 )

src/macho/Segment64.go

@@ -14,5 +14,5 @@ type Segment64 struct {
 	MaxProt      Prot
 	InitProt     Prot
 	NumSections  uint32
-	Flag         uint32
+	Flag         SegmentFlags
 }

src/macho/SegmentFlags.go

@@ -0,0 +1,7 @@
+package macho
+
+type SegmentFlags uint32
+
+const (
+	SegmentReadOnly SegmentFlags = 0x10
+)