From 6e7b60f7bf1bb8ffd08b8ee476cad7946f02c301 Mon Sep 17 00:00:00 2001
From: Eduard Urbach <eduard@urbach.dev>
Date: Tue, 5 Aug 2025 15:53:22 +0200
Subject: [PATCH] Added build version information for Mac builds

---
 src/macho/BuildVersion.go | 13 +++++++++++++
 src/macho/Constants.go    |  4 ++--
 src/macho/LoadCommand.go  |  1 +
 src/macho/MachO.go        | 26 ++++++++++++++++++--------
 src/macho/Platform.go     |  9 +++++++++
 src/macho/Version.go      |  6 ++++++
 6 files changed, 49 insertions(+), 10 deletions(-)
 create mode 100644 src/macho/BuildVersion.go
 create mode 100644 src/macho/Platform.go
 create mode 100644 src/macho/Version.go

diff --git a/src/macho/BuildVersion.go b/src/macho/BuildVersion.go
new file mode 100644
index 0000000..b5c17ce
--- /dev/null
+++ b/src/macho/BuildVersion.go
@@ -0,0 +1,13 @@
+package macho
+
+const BuildVersionSize = 24
+
+// BuildVersion is the structure of the LC_BUILD_VERSION load command.
+type BuildVersion struct {
+	LoadCommand
+	Length   uint32
+	Platform Platform
+	MinOS    uint32
+	Sdk      uint32
+	NumTools uint32
+}
\ No newline at end of file
diff --git a/src/macho/Constants.go b/src/macho/Constants.go
index a24abf6..5d5306d 100644
--- a/src/macho/Constants.go
+++ b/src/macho/Constants.go
@@ -2,7 +2,7 @@ package macho
 
 const (
 	BaseAddress  = 0x1000000
-	NumCommands  = 7
-	SizeCommands = Segment64Size*3 + Section64Size + DyldInfoCommandSize + MainSize + DylinkerCommandSize + len(LinkerString) + DylibCommandSize + len(LibSystemString)
+	NumCommands  = 8
+	SizeCommands = Segment64Size*3 + Section64Size + DyldInfoCommandSize + MainSize + BuildVersionSize + DylinkerCommandSize + len(LinkerString) + DylibCommandSize + len(LibSystemString)
 	HeaderEnd    = HeaderSize + SizeCommands
 )
\ No newline at end of file
diff --git a/src/macho/LoadCommand.go b/src/macho/LoadCommand.go
index 6b2f806..c2cf453 100644
--- a/src/macho/LoadCommand.go
+++ b/src/macho/LoadCommand.go
@@ -31,4 +31,5 @@ const (
 	LcEncryptionInfo64   LoadCommand = 0x2C
 	LcVersionMinTvos     LoadCommand = 0x2F
 	LcVersionMinWatchos  LoadCommand = 0x30
+	LcBuildVersion       LoadCommand = 0x32
 )
\ No newline at end of file
diff --git a/src/macho/MachO.go b/src/macho/MachO.go
index 4ac3720..3470230 100644
--- a/src/macho/MachO.go
+++ b/src/macho/MachO.go
@@ -11,14 +11,15 @@ import (
 // MachO is the executable format used on MacOS.
 type MachO struct {
 	Header
-	PageZero        Segment64
-	CodeSegment     Segment64
-	CodeSection     Section64
-	DataSegment     Segment64
-	MainHeader      Main
-	InfoHeader      DyldInfoCommand
-	LinkerHeader    DylinkerCommand
-	LibSystemHeader DylibCommand
+	PageZero           Segment64
+	CodeSegment        Segment64
+	CodeSection        Section64
+	DataSegment        Segment64
+	MainHeader         Main
+	BuildVersionHeader BuildVersion
+	InfoHeader         DyldInfoCommand
+	LinkerHeader       DylinkerCommand
+	LibSystemHeader    DylibCommand
 }
 
 // Write writes the Mach-O format to the given writer.
@@ -92,6 +93,14 @@ func Write(writer io.WriteSeeker, build *config.Build, codeBytes []byte, dataByt
 			EntryFileOffset: uint64(code.MemoryOffset),
 			StackSize:       0,
 		},
+		BuildVersionHeader: BuildVersion{
+			LoadCommand: LcBuildVersion,
+			Length:      BuildVersionSize,
+			Platform:    PlatformMacOS,
+			MinOS:       Version(10, 7, 5),
+			Sdk:         0,
+			NumTools:    0,
+		},
 		InfoHeader: DyldInfoCommand{
 			LoadCommand: LcDyldInfoOnly,
 			Length:      DyldInfoCommandSize,
@@ -114,6 +123,7 @@ func Write(writer io.WriteSeeker, build *config.Build, codeBytes []byte, dataByt
 	binary.Write(writer, binary.LittleEndian, &m.CodeSection)
 	binary.Write(writer, binary.LittleEndian, &m.DataSegment)
 	binary.Write(writer, binary.LittleEndian, &m.MainHeader)
+	binary.Write(writer, binary.LittleEndian, &m.BuildVersionHeader)
 	binary.Write(writer, binary.LittleEndian, &m.InfoHeader)
 	binary.Write(writer, binary.LittleEndian, &m.LinkerHeader)
 	writer.Write([]byte(LinkerString))
diff --git a/src/macho/Platform.go b/src/macho/Platform.go
new file mode 100644
index 0000000..52b0458
--- /dev/null
+++ b/src/macho/Platform.go
@@ -0,0 +1,9 @@
+package macho
+
+type Platform uint32
+
+const (
+	PlatformInvalid Platform = iota
+	PlatformMacOS
+	PlatformIOS
+)
\ No newline at end of file
diff --git a/src/macho/Version.go b/src/macho/Version.go
new file mode 100644
index 0000000..6320d46
--- /dev/null
+++ b/src/macho/Version.go
@@ -0,0 +1,6 @@
+package macho
+
+// Version creates the version for the build version load command.
+func Version(major uint32, minor uint32, patch uint32) uint32 {
+	return major<<24 | minor<<16 | patch<<8
+}
\ No newline at end of file
-- 
2.51.2