0001-go1.13-temp-fix-for-darwin-arm64.patch

From 234e37c1b338899f1269981aabc651f3b103c7ec Mon Sep 17 00:00:00 2001
From: Tonis Tiigi <tonistiigi@gmail.com>
Date: Mon, 13 Jul 2020 22:49:20 -0700
Subject: [PATCH] [go1.13] temp fix for darwin/arm64

Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>
---
 src/cmd/link/internal/ld/lib.go | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/cmd/link/internal/ld/lib.go b/src/cmd/link/internal/ld/lib.go
index 3fa258d275..84c6e319e5 100644
--- a/src/cmd/link/internal/ld/lib.go
+++ b/src/cmd/link/internal/ld/lib.go
@@ -432,7 +432,7 @@ func (ctxt *Link) loadlib() {
 		toc.Type = sym.SDYNIMPORT
 	}
 
-	if ctxt.LinkMode == LinkExternal && !iscgo && ctxt.LibraryByPkg["runtime/cgo"] == nil && !(objabi.GOOS == "darwin" && (ctxt.Arch.Family == sys.AMD64 || ctxt.Arch.Family == sys.I386)) {
+	if ctxt.LinkMode == LinkExternal && !iscgo && ctxt.LibraryByPkg["runtime/cgo"] == nil && !(objabi.GOOS == "darwin" && (ctxt.Arch.Family == sys.AMD64 || ctxt.Arch.Family == sys.I386 || ctxt.Arch.Family == sys.ARM64)) {
 		// This indicates a user requested -linkmode=external.
 		// The startup code uses an import of runtime/cgo to decide
 		// whether to initialize the TLS.  So give it one. This could
@@ -1483,7 +1483,7 @@ func (ctxt *Link) hostlink() {
 			Exitf("%s: parsing Mach-O header failed: %v", os.Args[0], err)
 		}
 		// Only macOS supports unmapped segments such as our __DWARF segment.
-		if machoPlatform == PLATFORM_MACOS {
+		if machoPlatform == PLATFORM_MACOS && ctxt.Arch.Family == sys.AMD64 {
 			if err := machoCombineDwarf(ctxt, exef, exem, dsym, combinedOutput); err != nil {
 				Exitf("%s: combining dwarf failed: %v", os.Args[0], err)
 			}
-- 
2.24.1

0001-go1.14-temp-fix-for-darwin-arm64.patch

From c52a6757bcf64ed9d8b6c1b5e2775189ea42cce7 Mon Sep 17 00:00:00 2001
From: Tonis Tiigi <tonistiigi@gmail.com>
Date: Mon, 13 Jul 2020 18:17:48 -0700
Subject: [PATCH] temp fix for darwin/arm64

Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>
---
 src/cmd/link/internal/ld/lib.go | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/src/cmd/link/internal/ld/lib.go b/src/cmd/link/internal/ld/lib.go
index 45cc87287c..32e431fbef 100644
--- a/src/cmd/link/internal/ld/lib.go
+++ b/src/cmd/link/internal/ld/lib.go
@@ -437,7 +437,7 @@ func (ctxt *Link) loadlib() {
 	// We now have enough information to determine the link mode.
 	determineLinkMode(ctxt)
 
-	if ctxt.LinkMode == LinkExternal && !iscgo && ctxt.LibraryByPkg["runtime/cgo"] == nil && !(objabi.GOOS == "darwin" && ctxt.BuildMode != BuildModePlugin && (ctxt.Arch.Family == sys.AMD64 || ctxt.Arch.Family == sys.I386)) {
+	if ctxt.LinkMode == LinkExternal && !iscgo && ctxt.LibraryByPkg["runtime/cgo"] == nil && !(objabi.GOOS == "darwin" && ctxt.BuildMode != BuildModePlugin && (ctxt.Arch.Family == sys.AMD64 || ctxt.Arch.Family == sys.I386 || ctxt.Arch.Family == sys.ARM64)) {
 		// This indicates a user requested -linkmode=external.
 		// The startup code uses an import of runtime/cgo to decide
 		// whether to initialize the TLS.  So give it one. This could
@@ -1214,7 +1214,7 @@ func (ctxt *Link) hostlink() {
 
 	switch ctxt.HeadType {
 	case objabi.Hdarwin:
-		if machoPlatform == PLATFORM_MACOS {
+		if machoPlatform == PLATFORM_MACOS && !ctxt.Arch.InFamily(sys.ARM, sys.ARM64) {
 			// -headerpad is incompatible with -fembed-bitcode.
 			argv = append(argv, "-Wl,-headerpad,1144")
 		}
@@ -1254,7 +1254,7 @@ func (ctxt *Link) hostlink() {
 	switch ctxt.BuildMode {
 	case BuildModeExe:
 		if ctxt.HeadType == objabi.Hdarwin {
-			if machoPlatform == PLATFORM_MACOS {
+			if machoPlatform == PLATFORM_MACOS && !ctxt.Arch.InFamily(sys.ARM, sys.ARM64) {
 				argv = append(argv, "-Wl,-no_pie")
 				argv = append(argv, "-Wl,-pagezero_size,4000000")
 			}
@@ -1561,7 +1561,7 @@ func (ctxt *Link) hostlink() {
 			Exitf("%s: parsing Mach-O header failed: %v", os.Args[0], err)
 		}
 		// Only macOS supports unmapped segments such as our __DWARF segment.
-		if machoPlatform == PLATFORM_MACOS {
+		if machoPlatform == PLATFORM_MACOS && ctxt.Arch.Family == sys.AMD64 {
 			if err := machoCombineDwarf(ctxt, exef, exem, dsym, combinedOutput); err != nil {
 				Exitf("%s: combining dwarf failed: %v", os.Args[0], err)
 			}
-- 
2.24.1

0001-temp-fix-for-darwin-arm64.patch

From 80be55061d0d316f48299943fe263d8e3e992e0c Mon Sep 17 00:00:00 2001
From: Tonis Tiigi <tonistiigi@gmail.com>
Date: Mon, 13 Jul 2020 18:17:48 -0700
Subject: [PATCH] temp fix for darwin/arm64

Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>
---
 src/cmd/link/internal/ld/lib.go | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/src/cmd/link/internal/ld/lib.go b/src/cmd/link/internal/ld/lib.go
index b0a9613e4f..fd63f1878a 100644
--- a/src/cmd/link/internal/ld/lib.go
+++ b/src/cmd/link/internal/ld/lib.go
@@ -554,7 +554,7 @@ func (ctxt *Link) loadlib() {
 	// We now have enough information to determine the link mode.
 	determineLinkMode(ctxt)
 
-	if ctxt.LinkMode == LinkExternal && !iscgo && !(objabi.GOOS == "darwin" && ctxt.BuildMode != BuildModePlugin && ctxt.Arch.Family == sys.AMD64) {
+	if ctxt.LinkMode == LinkExternal && !iscgo && !(objabi.GOOS == "darwin" && ctxt.BuildMode != BuildModePlugin && (ctxt.Arch.Family == sys.AMD64 || ctxt.Arch.Family == sys.ARM64)) {
 		// This indicates a user requested -linkmode=external.
 		// The startup code uses an import of runtime/cgo to decide
 		// whether to initialize the TLS.  So give it one. This could
@@ -1368,7 +1368,7 @@ func (ctxt *Link) hostlink() {
 
 	switch ctxt.HeadType {
 	case objabi.Hdarwin:
-		if machoPlatform == PLATFORM_MACOS {
+		if machoPlatform == PLATFORM_MACOS && !ctxt.Arch.InFamily(sys.ARM, sys.ARM64) {
 			// -headerpad is incompatible with -fembed-bitcode.
 			argv = append(argv, "-Wl,-headerpad,1144")
 		}
@@ -1408,7 +1408,7 @@ func (ctxt *Link) hostlink() {
 	switch ctxt.BuildMode {
 	case BuildModeExe:
 		if ctxt.HeadType == objabi.Hdarwin {
-			if machoPlatform == PLATFORM_MACOS {
+			if machoPlatform == PLATFORM_MACOS && !ctxt.Arch.InFamily(sys.ARM, sys.ARM64) {
 				argv = append(argv, "-Wl,-no_pie")
 				argv = append(argv, "-Wl,-pagezero_size,4000000")
 			}
@@ -1735,7 +1735,7 @@ func (ctxt *Link) hostlink() {
 			Exitf("%s: parsing Mach-O header failed: %v", os.Args[0], err)
 		}
 		// Only macOS supports unmapped segments such as our __DWARF segment.
-		if machoPlatform == PLATFORM_MACOS {
+		if machoPlatform == PLATFORM_MACOS && ctxt.Arch.Family == sys.AMD64 {
 			if err := machoCombineDwarf(ctxt, exef, exem, dsym, combinedOutput); err != nil {
 				Exitf("%s: combining dwarf failed: %v", os.Args[0], err)
 			}
-- 
2.24.1

clang_arm64_wrapper.sh

#!/usr/bin/env sh

# Download "Xcode 12 for macOS Universal Apps" from https://developer.apple.com/download/
# Rebuild go with patches for your branch
# Save this wrapper script and point `CC` env to it: export CC=./path/to/clang_arm64_wrapper.sh
# If needed modify XCODE_PATH
# Set GOOS=darwin GOARCH=arm64
#
# For building universal binaries: lipo -create -output binary binary_arm64 binary_amd64

export XCODE_PATH=$HOME/Downloads/Xcode-beta.app
export SDK_PATH=$XCODE_PATH/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX11.0.sdk
export CGO_TARGET=arm64-apple-macos11
export CC=$XCODE_PATH/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang

TARGETFLAGS=""
if [ "$GOARCH" == "arm64" ] && [ "$GOOS" == "darwin" ]; then
    TARGETFLAGS="-isysroot $SDK_PATH --target=$CGO_TARGET"
fi

$CC "$@" $TARGETFLAGS

I found that I needed to change/add export SDKROOT=$SDK_PATH for the wrapper script to work