From 3c607ed3275f216ccd034f51c8cbdb8f83d98733 Mon Sep 17 00:00:00 2001
From: Junyi Yi <yijunyi@google.com>
Date: Mon, 11 Nov 2024 20:41:47 -0500
Subject: [PATCH] add library build script to Go taskfile

---
 client/go/Taskfile.yml | 35 ++++++++++++++++++++++++-----------
 1 file changed, 24 insertions(+), 11 deletions(-)

diff --git a/client/go/Taskfile.yml b/client/go/Taskfile.yml
index 5d17c13b0d..d100d225eb 100644
--- a/client/go/Taskfile.yml
+++ b/client/go/Taskfile.yml
@@ -25,32 +25,45 @@ vars:
 
 tasks:
   electron:
-    desc: "Build the tun2socks binary for Electron platforms"
+    desc: "Build the tun2socks binary and library for Electron platforms"
     internal: true
-    requires: {vars: [TARGET_OS]}
+    requires: {vars: [TARGET_OS, TARGET_ARCH]}
     vars:
       # TODO(fortuna): remove this, it's not really needed since we don't release it separately anymore.
       TUN2SOCKS_VERSION: "v1.16.11"
       OUTPUT: '{{.OUT_DIR}}/{{.TARGET_OS}}/tun2socks{{if eq .TARGET_OS "windows"}}.exe{{end}}'
+      # Linux=libbackend.so; Windows=backend.dll
+      OUTPUT_LIB: '{{.OUT_DIR}}/{{.TARGET_OS}}/{{if eq .TARGET_OS "linux"}}libbackend.so{{else}}backend.dll{{end}}'
     cmds:
       - rm -rf "{{dir .OUTPUT}}" && mkdir -p "{{dir .OUTPUT}}"
+      # C cross-compile (zig) targets:
+      #   Linux (x64)   = x86_64-linux-gnu (`x86_64-linux` defaults to `x86_64-linux-musl`, prefer `gnu` over `musl`)
+      #   Windows (x86) = x86-windows
       # Linker flags: https://pkg.go.dev/cmd/link
-      # -s Omit the symbol table and debug information.
-      # -w Omit the DWARF symbol table.
-      # -X Set the value of the string variable.
+      #   -s Omit the symbol table and debug information.
+      #   -w Omit the DWARF symbol table.
+      #   -X Set the value of the string variable.
       - |
-        {{if ne OS .TARGET_OS -}}
-          GOOS={{.TARGET_OS}} GOARCH=amd64 CGO_ENABLED=1 CC='zig cc -target x86_64-{{.TARGET_OS}}'
+        {{if or (ne OS .TARGET_OS) (ne ARCH .TARGET_ARCH) -}}
+          GOOS={{.TARGET_OS}} GOARCH={{.TARGET_ARCH}} CGO_ENABLED=1 \
+          CC='zig cc -target {{if eq .TARGET_ARCH "386"}}x86{{else}}x86_64{{end}}-{{.TARGET_OS}}{{if eq .TARGET_OS "linux"}}-gnu{{end}}'
         {{- end}} \
         go build -trimpath -ldflags="-s -w -X=main.version={{.TUN2SOCKS_VERSION}}" -o '{{.OUTPUT}}' '{{.TASKFILE_DIR}}/outline/electron'
+      - |
+        {{if or (ne OS .TARGET_OS) (ne ARCH .TARGET_ARCH) -}}
+          GOOS={{.TARGET_OS}} GOARCH={{.TARGET_ARCH}} CGO_ENABLED=1 \
+          CC='zig cc -target {{if eq .TARGET_ARCH "386"}}x86{{else}}x86_64{{end}}-{{.TARGET_OS}}{{if eq .TARGET_OS "linux"}}-gnu{{end}}'
+        {{- end}} \
+        go build -trimpath -buildmode=c-shared -ldflags="-s -w -X=main.version={{.TUN2SOCKS_VERSION}}" -o '{{.OUTPUT_LIB}}' '{{.TASKFILE_DIR}}/outline/electron'
 
   windows:
-    desc: "Build the tun2socks binary for Windows"
-    cmds: [{task: electron, vars: {TARGET_OS: "windows"}}]
+    desc: "Build the tun2socks binary and library for Windows"
+    # 32bit Windows 10 still exists until October 14, 2025
+    cmds: [{task: electron, vars: {TARGET_OS: "windows", TARGET_ARCH: "386"}}]
 
   linux:
-    desc: "Build the tun2socks binary for Linux"
-    cmds: [{task: electron, vars: {TARGET_OS: "linux"}}]
+    desc: "Build the tun2socks binary and library for Linux"
+    cmds: [{task: electron, vars: {TARGET_OS: "linux", TARGET_ARCH: "amd64"}}]
 
   android:
     desc: "Build the tun2socks.aar library for Android"