diff --git a/Formula/l/llgo.rb b/Formula/l/llgo.rb
index fdc20dbbcd1c..814723e0bfd4 100644
--- a/Formula/l/llgo.rb
+++ b/Formula/l/llgo.rb
@@ -1,10 +1,10 @@
 class Llgo < Formula
   desc "Go compiler based on LLVM integrate with the C ecosystem and Python"
-  homepage "https://github.com/goplus/llgo"
-  url "https://github.com/goplus/llgo/archive/refs/tags/v0.11.5.tar.gz"
-  sha256 "e025993d12c1f5e49e5b8dcb31c0e8b349efe56970d1a23d6c089ebd10928c6b"
+  homepage "https://github.com/luoliwoshang/llgo"
+  url "https://github.com/luoliwoshang/llgo/archive/refs/tags/v0.12.13.tar.gz"
+  sha256 "13106bf7d4812e58a427a565ab7413c6d086d12c3dbfaf058f47908cbe0bb40c"
   license "Apache-2.0"
-  head "https://github.com/goplus/llgo.git", branch: "main"
+  head "https://github.com/luoliwoshang/llgo.git", branch: "main"
 
   livecheck do
     url :stable
@@ -21,18 +21,21 @@ class Llgo < Formula
     sha256               x86_64_linux:  "2486bc3ddd7c27fe03c9ae10df73553c09b9f21b3d4dc94b55f99da632dbbf5f"
   end
 
+  depends_on "cmake" => :build
+  depends_on "ninja" => :build
+  depends_on "python@3.13" => :build
   depends_on "bdw-gc"
   depends_on "go@1.24"
   depends_on "libffi"
   depends_on "libuv"
-  depends_on "lld@19"
-  depends_on "llvm@19"
   depends_on "openssl@3"
   depends_on "pkgconf"
   uses_from_macos "zlib"
 
-  on_linux do
-    depends_on "libunwind"
+  resource "espressif-llvm" do
+    url "https://github.com/espressif/llvm-project.git",
+      revision: "xtensa_release_19.1.2",
+      shallow:  true
   end
 
   def find_dep(name)
@@ -41,37 +44,151 @@ def find_dep(name)
   end
 
   def install
-    llvm = find_dep("llvm")
+    esp_clang_path = libexec/"crosscompile/clang"
+    local_llvm_config = esp_clang_path/"bin/llvm-config"
+    local_llvm_include = esp_clang_path/"include"
+    local_llvm_lib = esp_clang_path/"lib"
+    llvm_build_target_component = %w[clang llvm-config llvm-ar llvm-nm lld]
+
+    resource("espressif-llvm").stage do
+      mkdir "build" do
+        cmake_args = %w[
+          -G Ninja
+          -DCMAKE_BUILD_TYPE=Release
+          -DLLVM_TARGETS_TO_BUILD=X86;ARM;AArch64;AVR;Mips;RISCV;WebAssembly
+          -DLLVM_EXPERIMENTAL_TARGETS_TO_BUILD=Xtensa
+          -DLLVM_ENABLE_PROJECTS=clang;lld
+          -DLLVM_ENABLE_RUNTIMES=compiler-rt;libcxx;libcxxabi;libunwind
+          -DLLVM_POLLY_LINK_INTO_TOOLS=ON
+          -DLLVM_BUILD_EXTERNAL_COMPILER_RT=ON
+          -DLLVM_ENABLE_EH=ON
+          -DLLVM_ENABLE_RTTI=ON
+          -DLLVM_INCLUDE_DOCS=OFF
+          -DLLVM_INCLUDE_EXAMPLES=OFF
+          -DLLVM_INCLUDE_TESTS=OFF
+          -DLLVM_INCLUDE_BENCHMARKS=OFF
+          -DLLVM_BUILD_DOCS=OFF
+          -DLLVM_ENABLE_DOXYGEN=OFF
+          -DLLVM_INSTALL_UTILS=OFF
+          -DLLVM_ENABLE_Z3_SOLVER=OFF
+          -DLLVM_OPTIMIZED_TABLEGEN=ON
+          -DLLVM_USE_RELATIVE_PATHS_IN_FILES=ON
+          -DLLVM_SOURCE_PREFIX=.
+          -DLIBCXX_INSTALL_MODULES=ON
+          -DCLANG_FORCE_MATCHING_LIBCLANG_SOVERSION=OFF
+          -DCOMPILER_RT_BUILD_SANITIZERS=OFF
+          -DCOMPILER_RT_BUILD_XRAY=OFF
+          -DCOMPILER_RT_BUILD_LIBFUZZER=OFF
+          -DCOMPILER_RT_BUILD_PROFILE=OFF
+          -DCOMPILER_RT_BUILD_MEMPROF=OFF
+          -DCOMPILER_RT_BUILD_ORC=OFF
+          -DCOMPILER_RT_BUILD_GWP_ASAN=OFF
+          -DCOMPILER_RT_BUILD_CTX_PROFILE=OFF
+          -DCMAKE_POSITION_INDEPENDENT_CODE=ON
+          -DLLVM_ENABLE_PER_TARGET_RUNTIME_DIR=OFF
+          -DCOMPILER_RT_DEFAULT_TARGET_ONLY=ON
+          -DCOMPILER_RT_USE_BUILTINS_LIBRARY=ON
+          -DLIBCXX_ENABLE_STATIC_ABI_LIBRARY=ON
+          -DLIBCXX_STATICALLY_LINK_ABI_IN_SHARED_LIBRARY=OFF
+          -DLIBCXX_STATICALLY_LINK_ABI_IN_STATIC_LIBRARY=ON
+          -DLIBCXX_USE_COMPILER_RT=ON
+          -DLIBCXX_HAS_ATOMIC_LIB=OFF
+          -DLIBCXXABI_ENABLE_STATIC_UNWINDER=ON
+          -DLIBCXXABI_STATICALLY_LINK_UNWINDER_IN_SHARED_LIBRARY=OFF
+          -DLIBCXXABI_STATICALLY_LINK_UNWINDER_IN_STATIC_LIBRARY=ON
+          -DLIBCXXABI_USE_COMPILER_RT=ON
+          -DLIBCXXABI_USE_LLVM_UNWINDER=ON
+          -DLIBUNWIND_USE_COMPILER_RT=ON
+          -DSANITIZER_CXX_ABI=libc++
+          -DSANITIZER_TEST_CXX=libc++
+          -DLLVM_LINK_LLVM_DYLIB=ON
+          -DCLANG_LINK_CLANG_DYLIB=ON
+          -DCMAKE_STRIP=/usr/bin/strip
+        ]
+
+        # Add macOS-specific arguments
+        cmake_args += if OS.mac?
+          %W[
+            -DLLVM_BUILD_LLVM_C_DYLIB=ON
+            -DLLVM_ENABLE_LIBCXX=ON
+            -DLIBCXX_PSTL_BACKEND=libdispatch
+            -DCMAKE_OSX_SYSROOT=#{MacOS.sdk_path}
+            -DCMAKE_OSX_ARCHITECTURES=#{Hardware::CPU.arch}
+            -DLIBCXXABI_USE_SYSTEM_LIBS=ON
+          ]
+        else
+          %w[
+            -DLLVM_ENABLE_LIBXML2=OFF
+            -DLLVM_ENABLE_LIBCXX=OFF
+            -DCLANG_DEFAULT_CXX_STDLIB=libstdc++
+            -DLLVM_BUILD_LLVM_DYLIB=ON
+            -DCOMPILER_RT_USE_LLVM_UNWINDER=ON
+          ]
+        end
+
+        cmake_args += %w[
+          -DLLVM_INCLUDE_TESTS=OFF
+          -DLLVM_ENABLE_TERMINFO=OFF
+          -DLLVM_ENABLE_ZSTD=OFF
+          -DLLVM_ENABLE_LIBEDIT=OFF
+          -DLLVM_ENABLE_Z3_SOLVER=OFF
+          -DLLVM_ENABLE_OCAMLDOC=OFF
+          -DLLVM_ENABLE_LIBXML2=OFF
+          -DLLVM_TOOL_CLANG_TOOLS_EXTRA_BUILD=OFF
+          -DCLANG_ENABLE_ARCMT=OFF
+        ]
+        cmake_args << "-DCMAKE_INSTALL_PREFIX=#{esp_clang_path}"
+
+        # Fix rpath for libc++ libraries to pass Homebrew linkage tests
+        # Without @loader_path, libc++.1.0.dylib and libc++abi.1.0.dylib fail
+        # brew linkage --cached --test --strict with "Files with missing rpath" error
+        cmake_args << "-DRUNTIMES_CMAKE_ARGS=-DCMAKE_INSTALL_RPATH=#{rpath}"
+
+        system "cmake", *cmake_args, "../llvm"
+
+        # Build with all available cores
+        system "ninja", "-j#{ENV.make_jobs}", *llvm_build_target_component
+        system "ninja", "install"
+      end
+    end
+
     ldflags = %W[
       -s -w
       -X github.com/goplus/llgo/internal/env.buildVersion=v#{version}
       -X github.com/goplus/llgo/internal/env.buildTime=#{time.iso8601}
-      -X github.com/goplus/llgo/xtool/env/llvm.ldLLVMConfigBin=#{llvm.opt_bin/"llvm-config"}
+      -X github.com/goplus/llgo/xtool/env/llvm.ldLLVMConfigBin=#{local_llvm_config}
     ]
-    tags = nil
+
+    ENV.prepend "CGO_CXXFLAGS", "-std=c++17"
+    ENV.prepend "CGO_LDFLAGS", "-L#{local_llvm_lib} -lLLVM -Wl,-rpath,#{local_llvm_lib}"
     if OS.linux?
       ENV.prepend "CGO_CPPFLAGS",
-        "-I#{llvm.opt_include} " \
+        "-I#{local_llvm_include} " \
         "-D_GNU_SOURCE " \
         "-D__STDC_CONSTANT_MACROS " \
         "-D__STDC_FORMAT_MACROS " \
         "-D__STDC_LIMIT_MACROS"
-      ENV.prepend "CGO_LDFLAGS", "-L#{llvm.opt_lib} -lLLVM"
-      tags = "byollvm"
+    else
+      ENV.prepend "CGO_CPPFLAGS", "-I#{local_llvm_include}"
     end
 
-    system "go", "build", *std_go_args(ldflags:, tags:), "-o", libexec/"bin/", "./cmd/llgo"
+    ohai "CGO_CXXFLAGS: #{ENV["CGO_CXXFLAGS"]}"
+    ohai "CGO_CPPFLAGS: #{ENV["CGO_CPPFLAGS"]}"
+    ohai "CGO_LDFLAGS: #{ENV["CGO_LDFLAGS"]}"
+    ohai "Start Building LLGO..."
+
+    # byollvm to use custom llvm
+    system "go", "build", *std_go_args(ldflags: ldflags, tags: "byollvm"), "-o", libexec/"bin/", "./cmd/llgo"
 
-    libexec.install "LICENSE", "README.md", "go.mod", "go.sum", "runtime"
+    libexec.install "LICENSE", "README.md", "go.mod", "go.sum", "runtime", "targets"
 
-    path_deps = %w[lld go pkgconf].map { |name| find_dep(name).opt_bin }
-    path_deps << llvm.opt_bin
+    path_deps = %w[go pkgconf].map { |name| find_dep(name).opt_bin }
+    path_deps << (esp_clang_path/"bin")
     script_env = { PATH: "#{path_deps.join(":")}:$PATH" }
 
     if OS.linux?
-      libunwind = find_dep("libunwind")
-      script_env[:CFLAGS] = "-I#{libunwind.opt_include} $CFLAGS"
-      script_env[:LDFLAGS] = "-L#{libunwind.opt_lib} -rpath #{libunwind.opt_lib} $LDFLAGS"
+      script_env[:CFLAGS] = "-I#{local_llvm_include} $CFLAGS"
+      script_env[:LDFLAGS] = "-L#{local_llvm_lib} $LDFLAGS"
     end
 
     (libexec/"bin").children.each do |f|
@@ -93,6 +210,10 @@ def install
     bdwgc = find_dep("bdw-gc")
     ENV.prepend_path "LD_LIBRARY_PATH", bdwgc.opt_lib
 
+    ohai "CCFLAGS: #{ENV["CCFLAGS"]}"
+    ohai "CFLAGS: #{ENV["CFLAGS"]}"
+    ohai "LDFLAGS: #{ENV["LDFLAGS"]}"
+
     (testpath/"hello.go").write <<~GO
       package main
 
@@ -100,6 +221,7 @@ def install
           "fmt"
 
           "github.com/goplus/lib/c"
+          "github.com/goplus/lib/cpp/std"
       )
 
       func Foo() string {
@@ -109,6 +231,7 @@ def install
       func main() {
         fmt.Println("Hello LLGo by fmt.Println")
         c.Printf(c.Str("Hello LLGo by c.Printf\\n"))
+        c.Printf(std.Str("Hello LLGo by cpp/std.Str\\n").CStr())
       }
     GO
     (testpath/"hello_test.go").write <<~GO
@@ -130,14 +253,33 @@ module hello
     system go.opt_bin/"go", "get", "github.com/goplus/lib"
     # Test llgo run
     assert_equal "Hello LLGo by fmt.Println\n" \
-                 "Hello LLGo by c.Printf\n",
-                 shell_output("#{bin}/llgo run .")
+                 "Hello LLGo by c.Printf\n" \
+                 "Hello LLGo by cpp/std.Str\n",
+                 shell_output("#{bin}/llgo run -v .")
     # Test llgo build
     system bin/"llgo", "build", "-o", "hello", "."
     assert_equal "Hello LLGo by fmt.Println\n" \
-                 "Hello LLGo by c.Printf\n",
+                 "Hello LLGo by c.Printf\n" \
+                 "Hello LLGo by cpp/std.Str\n",
                  shell_output("./hello")
     # Test llgo test
     assert_match "PASS", shell_output("#{bin}/llgo test .")
+
+    # Test embed targets
+    # Homebrew sets LDFLAGS with macOS-specific flags (-F/opt/homebrew/Frameworks,
+    # -Wl,-headerpad_max_install_names, -isysroot) that are incompatible with
+    # ld.lld when cross-compiling for embedded targets. Clear them.
+    with_env("LDFLAGS" => "") do
+      (testpath/"emb"/"main.go").write <<~GO
+        package main
+
+        func main() {
+        }
+      GO
+      cd testpath/"emb" do
+        system bin/"llgo", "build", "-v", "-target", "esp32-coreboard-v2", "-o", "demo.out", "."
+        assert_path_exists testpath/"emb"/"demo.out.bin"
+      end
+    end
   end
 end