feat: support build on darwin arm64 (#2439)

main: support build on darwin arm64

Makefile

@@ -9,6 +9,7 @@ CLANG_SRC ?= $(LLVM_PROJECTDIR)/clang
 LLD_SRC ?= $(LLVM_PROJECTDIR)/lld
 
 # Try to autodetect LLVM build tools.
+# FIXME(#2438): This doesn't work on darwin now. Homebrew installed llvm is key-only.
 detect = $(shell command -v $(1) 2> /dev/null && echo $(1))
 CLANG ?= $(word 1,$(abspath $(call detect,llvm-build/bin/clang))$(call detect,clang-13)$(call detect,clang-12)$(call detect,clang-11)$(call detect,clang))
 LLVM_AR ?= $(word 1,$(abspath $(call detect,llvm-build/bin/llvm-ar))$(call detect,llvm-ar-13)$(call detect,llvm-ar-12)$(call detect,llvm-ar-11)$(call detect,llvm-ar))

builder/commands.go

@@ -2,6 +2,7 @@ package builder
 
 import (
 	"errors"
+	"fmt"
 	"os"
 	"os/exec"
 	"runtime"
@@ -25,7 +26,16 @@ func init() {
 	// Add the path to a Homebrew-installed LLVM for ease of use (no need to
 	// manually set $PATH).
 	if runtime.GOOS == "darwin" {
-		prefix := "/usr/local/opt/llvm@" + llvmMajor + "/bin/"
+		var prefix string
+		switch runtime.GOARCH {
+		case "amd64":
+			prefix = "/usr/local/opt/llvm@" + llvmMajor + "/bin/"
+		case "arm64":
+			prefix = "/opt/homebrew/opt/llvm@" + llvmMajor + "/bin/"
+		default:
+			// unknown GOARCH
+			panic(fmt.Sprintf("unknown GOARCH: %s on darwin", runtime.GOARCH))
+		}
 		commands["clang"] = append(commands["clang"], prefix+"clang-"+llvmMajor)
 		commands["ld.lld"] = append(commands["ld.lld"], prefix+"ld.lld")
 		commands["wasm-ld"] = append(commands["wasm-ld"], prefix+"wasm-ld")

cgo/libclang_config.go

@@ -5,10 +5,12 @@ package cgo
 
 /*
 #cgo linux        CFLAGS:  -I/usr/lib/llvm-11/include
-#cgo darwin  CFLAGS:  -I/usr/local/opt/llvm@11/include
+#cgo darwin amd64 CFLAGS:  -I/usr/local/opt/llvm@11/include
+#cgo darwin arm64 CFLAGS:  -I/opt/homebrew/opt/llvm@11/include
 #cgo freebsd      CFLAGS:  -I/usr/local/llvm11/include
 #cgo linux        LDFLAGS: -L/usr/lib/llvm-11/lib -lclang
-#cgo darwin  LDFLAGS: -L/usr/local/opt/llvm@11/lib -lclang -lffi
+#cgo darwin amd64 LDFLAGS: -L/usr/local/opt/llvm@11/lib -lclang -lffi
+#cgo darwin arm64 LDFLAGS: -L/opt/homebrew/opt/llvm@11/lib -lclang -lffi
 #cgo freebsd      LDFLAGS: -L/usr/local/llvm11/lib -lclang
 */
 import "C"

cgo/libclang_config_llvm12.go

@@ -1,14 +1,16 @@
-// +build !byollvm
+//go:build !byollvm && llvm12
-// +build llvm12
+// +build !byollvm,llvm12
 
 package cgo
 
 /*
 #cgo linux        CFLAGS:  -I/usr/lib/llvm-12/include
-#cgo darwin  CFLAGS:  -I/usr/local/opt/llvm@12/include
+#cgo darwin amd64 CFLAGS:  -I/usr/local/opt/llvm@12/include
+#cgo darwin arm64 CFLAGS:  -I/opt/homebrew/opt/llvm@12/include
 #cgo freebsd      CFLAGS:  -I/usr/local/llvm12/include
 #cgo linux        LDFLAGS: -L/usr/lib/llvm-12/lib -lclang
-#cgo darwin  LDFLAGS: -L/usr/local/opt/llvm@12/lib -lclang -lffi
+#cgo darwin amd64 LDFLAGS: -L/usr/local/opt/llvm@12/lib -lclang -lffi
+#cgo darwin arm64 LDFLAGS: -L/opt/homebrew/opt/llvm@12/lib -lclang -lffi
 #cgo freebsd      LDFLAGS: -L/usr/local/llvm12/lib -lclang
 */
 import "C"

cgo/libclang_config_llvm13.go

@@ -5,10 +5,12 @@ package cgo
 
 /*
 #cgo linux        CFLAGS:  -I/usr/lib/llvm-13/include
-#cgo darwin  CFLAGS:  -I/usr/local/opt/llvm@13/include
+#cgo darwin amd64 CFLAGS:  -I/usr/local/opt/llvm@13/include
+#cgo darwin arm64 CFLAGS:  -I/opt/homebrew/opt/llvm@13/include
 #cgo freebsd      CFLAGS:  -I/usr/local/llvm13/include
 #cgo linux        LDFLAGS: -L/usr/lib/llvm-13/lib -lclang
-#cgo darwin  LDFLAGS: -L/usr/local/opt/llvm@13/lib -lclang -lffi
+#cgo darwin amd64 LDFLAGS: -L/usr/local/opt/llvm@13/lib -lclang -lffi
+#cgo darwin arm64 LDFLAGS: -L/opt/homebrew/opt/llvm@13/lib -lclang -lffi
 #cgo freebsd      LDFLAGS: -L/usr/local/llvm13/lib -lclang
 */
 import "C"