diff --git a/.github/workflows/cleanup.sh b/.github/workflows/cleanup.sh
deleted file mode 100644
index 9153db88..00000000
--- a/.github/workflows/cleanup.sh
+++ /dev/null
@@ -1,6 +0,0 @@
-#!/bin/bash
-set -e
-
-if pkg=$(brew list | grep -E "pkg-config"); then
-    brew uninstall "$pkg" || true
-fi
diff --git a/.github/workflows/doc.yml b/.github/workflows/doc.yml
index e5f669a5..594bb059 100644
--- a/.github/workflows/doc.yml
+++ b/.github/workflows/doc.yml
@@ -16,10 +16,10 @@ jobs:
         uses: actions/setup-node@v4
         with:
           node-version: '20'
-          
+
       - name: Install embedme
         run: npm install -g embedme
-        
+
       - name: Verify README.md embedded code
         run: npx embedme --verify README.md
 
@@ -32,7 +32,7 @@ jobs:
     runs-on: ${{matrix.os}}
     steps:
       - uses: actions/checkout@v4
-        
+
       - name: Set up Go
         uses: actions/setup-go@v5
         with:
@@ -43,7 +43,6 @@ jobs:
         run: |
           set -e
           set -x
-          bash .github/workflows/cleanup.sh
           source doc/_readme/scripts/install_macos.sh
 
       - name: Install dependencies on Ubuntu
diff --git a/.github/workflows/go.yml b/.github/workflows/go.yml
index 8c6873d6..488e73c3 100644
--- a/.github/workflows/go.yml
+++ b/.github/workflows/go.yml
@@ -41,11 +41,10 @@ jobs:
       - name: Install dependencies
         if: startsWith(matrix.os, 'macos')
         run: |
-          bash .github/workflows/cleanup.sh
           brew update
-          brew install llvm@${{matrix.llvm}} pkg-config bdw-gc openssl libffi
+          brew install llvm@${{matrix.llvm}} bdw-gc openssl libffi
+          brew link --force libffi
           echo "$(brew --prefix llvm@${{matrix.llvm}})/bin" >> $GITHUB_PATH
-          echo "PKG_CONFIG_PATH=/opt/homebrew/opt/libffi/lib/pkgconfig" >> $GITHUB_ENV
 
           # Install optional deps for demos.
           #
diff --git a/.github/workflows/test_demo.sh b/.github/workflows/test_demo.sh
index 8e947f6a..42232e2f 100644
--- a/.github/workflows/test_demo.sh
+++ b/.github/workflows/test_demo.sh
@@ -1,13 +1,13 @@
 #!/bin/bash
 set -e
 
-# llgo run subdirectories under _demo and _pydemo
+# llgo run subdirectories under _demo and _pydemo that contain *.go files
 total=0
 failed=0
 failed_cases=""
 for d in ./_demo/* ./_pydemo/*; do
-  total=$((total+1))
-  if [ -d "$d" ]; then
+  if [ -d "$d" ] && [ -n "$(ls "$d"/*.go 2>/dev/null)" ]; then
+    total=$((total+1))
     echo "Testing $d"
     if ! (cd "$d" && llgo run .); then
       echo "FAIL"
diff --git a/README.md b/README.md
index 605f6a72..e5700d48 100644
--- a/README.md
+++ b/README.md
@@ -358,9 +358,11 @@ Follow these steps to generate the `llgo` command (its usage is the same as the
 
 ```sh
 brew update
-brew install llvm@18 pkg-config bdw-gc openssl cjson
+brew install llvm@18 bdw-gc openssl cjson libffi
 brew install python@3.12 # optional
+brew link --force libffi
 go install -v github.com/goplus/llgo/cmd/llgo@latest
+
 ```
 
 ### on Linux (Debian/Ubuntu)
@@ -371,7 +373,7 @@ go install -v github.com/goplus/llgo/cmd/llgo@latest
 echo "deb http://apt.llvm.org/$(lsb_release -cs)/ llvm-toolchain-$(lsb_release -cs)-18 main" | sudo tee /etc/apt/sources.list.d/llvm.list
 wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | sudo apt-key add -
 sudo apt-get update
-sudo apt-get install -y llvm-18-dev clang-18 libclang-18-dev lld-18 pkg-config libgc-dev libssl-dev zlib1g-dev libcjson-dev python3.12-dev
+sudo apt-get install -y llvm-18-dev clang-18 libclang-18-dev lld-18 pkg-config libgc-dev libssl-dev zlib1g-dev libcjson-dev libsqlite3-dev
 sudo apt-get install -y python3.12-dev # optional
 go install -v github.com/goplus/llgo/cmd/llgo@latest
 ```
diff --git a/chore/gentests/gentests.go b/chore/gentests/gentests.go
index ea465748..6cd06ba5 100644
--- a/chore/gentests/gentests.go
+++ b/chore/gentests/gentests.go
@@ -21,9 +21,7 @@ import (
 	"os"
 	"strings"
 
-	"github.com/goplus/llgo/cl"
 	"github.com/goplus/llgo/internal/llgen"
-	"github.com/goplus/llgo/ssa"
 	"github.com/goplus/mod"
 )
 
@@ -31,32 +29,15 @@ func main() {
 	dir, _, err := mod.FindGoMod(".")
 	check(err)
 
-	ssa.Initialize(ssa.InitAll | ssa.InitNative)
-	llgen.Verbose = false
-
 	llgenDir(dir + "/cl/_testlibc")
 	llgenDir(dir + "/cl/_testlibgo")
 	llgenDir(dir + "/cl/_testrt")
 	llgenDir(dir + "/cl/_testgo")
-	llgenDir(dir+"/cl/_testpy", "")
-	llgenDir(dir+"/cl/_testdata", "")
+	llgenDir(dir + "/cl/_testpy")
+	llgenDir(dir + "/cl/_testdata")
 }
 
-func isDbgSymEnabled(flagsFile string) bool {
-	data, err := os.ReadFile(flagsFile)
-	if err != nil {
-		return false
-	}
-	toks := strings.Split(strings.Join(strings.Split(string(data), "\n"), " "), " ")
-	for _, tok := range toks {
-		if tok == "-dbg" {
-			return true
-		}
-	}
-	return false
-}
-
-func llgenDir(dir string, pkgPath ...string) {
+func llgenDir(dir string) {
 	fis, err := os.ReadDir(dir)
 	check(err)
 	for _, fi := range fis {
@@ -67,10 +48,7 @@ func llgenDir(dir string, pkgPath ...string) {
 		testDir := dir + "/" + name
 		fmt.Fprintln(os.Stderr, "llgen", testDir)
 		check(os.Chdir(testDir))
-		dbg := isDbgSymEnabled("flags.txt")
-		cl.EnableDebugSymbols(dbg)
-
-		llgen.SmartDoFile("in.go", pkgPath...)
+		llgen.SmartDoFile(testDir)
 	}
 }
 
diff --git a/chore/llgen/llgen.go b/chore/llgen/llgen.go
index 4f14892b..50e9a89e 100644
--- a/chore/llgen/llgen.go
+++ b/chore/llgen/llgen.go
@@ -17,6 +17,7 @@
 package main
 
 import (
+	"flag"
 	"fmt"
 	"os"
 
@@ -24,11 +25,10 @@ import (
 )
 
 func main() {
-	if len(os.Args) < 2 {
-		fmt.Fprintln(os.Stderr, "Usage: llgen [flags] <pkg> [pkgPath]")
+	flag.Parse()
+	if len(flag.Args()) != 1 {
+		fmt.Fprintln(os.Stderr, "Usage: llgen [flags] <pkg>")
 		return
 	}
-	llgen.Init()
-	args := os.Args[1:]
-	llgen.SmartDoFile(args[0], args[1:]...)
+	llgen.SmartDoFile(flag.Args()[0])
 }
diff --git a/cl/_testdata/apkg/out.ll b/cl/_testdata/apkg/out.ll
index 165eea6c..adaa6e28 100644
--- a/cl/_testdata/apkg/out.ll
+++ b/cl/_testdata/apkg/out.ll
@@ -1,9 +1,9 @@
-; ModuleID = 'apkg'
-source_filename = "apkg"
+; ModuleID = 'github.com/goplus/llgo/cl/_testdata/apkg'
+source_filename = "github.com/goplus/llgo/cl/_testdata/apkg"
 
-@"apkg.init$guard" = global i1 false, align 1
+@"github.com/goplus/llgo/cl/_testdata/apkg.init$guard" = global i1 false, align 1
 
-define double @apkg.Max(double %0, double %1) {
+define double @"github.com/goplus/llgo/cl/_testdata/apkg.Max"(double %0, double %1) {
 _llgo_0:
   %2 = fcmp ogt double %0, %1
   br i1 %2, label %_llgo_1, label %_llgo_2
@@ -15,13 +15,13 @@ _llgo_2:                                          ; preds = %_llgo_0
   ret double %1
 }
 
-define void @apkg.init() {
+define void @"github.com/goplus/llgo/cl/_testdata/apkg.init"() {
 _llgo_0:
-  %0 = load i1, ptr @"apkg.init$guard", align 1
+  %0 = load i1, ptr @"github.com/goplus/llgo/cl/_testdata/apkg.init$guard", align 1
   br i1 %0, label %_llgo_2, label %_llgo_1
 
 _llgo_1:                                          ; preds = %_llgo_0
-  store i1 true, ptr @"apkg.init$guard", align 1
+  store i1 true, ptr @"github.com/goplus/llgo/cl/_testdata/apkg.init$guard", align 1
   br label %_llgo_2
 
 _llgo_2:                                          ; preds = %_llgo_1, %_llgo_0
diff --git a/cl/_testdata/llgotag/out.ll b/cl/_testdata/llgotag/out.ll
index 6eadd8e5..568edce1 100644
--- a/cl/_testdata/llgotag/out.ll
+++ b/cl/_testdata/llgotag/out.ll
@@ -1,20 +1,20 @@
-; ModuleID = 'llgotag'
-source_filename = "llgotag"
+; ModuleID = 'github.com/goplus/llgo/cl/_testdata/llgotag'
+source_filename = "github.com/goplus/llgo/cl/_testdata/llgotag"
 
-@"llgotag.init$guard" = global i1 false, align 1
+@"github.com/goplus/llgo/cl/_testdata/llgotag.init$guard" = global i1 false, align 1
 
-define void @llgotag.Foo() {
+define void @"github.com/goplus/llgo/cl/_testdata/llgotag.Foo"() {
 _llgo_0:
   ret void
 }
 
-define void @llgotag.init() {
+define void @"github.com/goplus/llgo/cl/_testdata/llgotag.init"() {
 _llgo_0:
-  %0 = load i1, ptr @"llgotag.init$guard", align 1
+  %0 = load i1, ptr @"github.com/goplus/llgo/cl/_testdata/llgotag.init$guard", align 1
   br i1 %0, label %_llgo_2, label %_llgo_1
 
 _llgo_1:                                          ; preds = %_llgo_0
-  store i1 true, ptr @"llgotag.init$guard", align 1
+  store i1 true, ptr @"github.com/goplus/llgo/cl/_testdata/llgotag.init$guard", align 1
   br label %_llgo_2
 
 _llgo_2:                                          ; preds = %_llgo_1, %_llgo_0
diff --git a/cl/_testdata/print/out.ll b/cl/_testdata/print/out.ll
index bd2de8a7..85340317 100644
--- a/cl/_testdata/print/out.ll
+++ b/cl/_testdata/print/out.ll
@@ -24,7 +24,7 @@ source_filename = "main"
 @_llgo_int16 = linkonce global ptr null, align 8
 @_llgo_int64 = linkonce global ptr null, align 8
 @_llgo_int = linkonce global ptr null, align 8
-@_llgo_uint8 = linkonce global ptr null, align 8
+@_llgo_byte = linkonce global ptr null, align 8
 @_llgo_uint16 = linkonce global ptr null, align 8
 @_llgo_uint32 = linkonce global ptr null, align 8
 @_llgo_uint64 = linkonce global ptr null, align 8
@@ -243,7 +243,7 @@ _llgo_2:                                          ; preds = %_llgo_1, %_llgo_3,
   %78 = insertvalue %"github.com/goplus/llgo/internal/runtime.eface" %77, ptr inttoptr (i64 5 to ptr), 1
   store %"github.com/goplus/llgo/internal/runtime.eface" %78, ptr %75, align 8
   %79 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %38, i64 10
-  %80 = load ptr, ptr @_llgo_uint8, align 8
+  %80 = load ptr, ptr @_llgo_byte, align 8
   %81 = insertvalue %"github.com/goplus/llgo/internal/runtime.eface" undef, ptr %80, 0
   %82 = insertvalue %"github.com/goplus/llgo/internal/runtime.eface" %81, ptr inttoptr (i64 1 to ptr), 1
   store %"github.com/goplus/llgo/internal/runtime.eface" %82, ptr %79, align 8
@@ -389,7 +389,7 @@ _llgo_14:                                         ; preds = %_llgo_55
 
 _llgo_15:                                         ; preds = %_llgo_55
   %25 = extractvalue %"github.com/goplus/llgo/internal/runtime.eface" %0, 0
-  %26 = load ptr, ptr @_llgo_uint8, align 8
+  %26 = load ptr, ptr @_llgo_byte, align 8
   %27 = icmp eq ptr %25, %26
   br i1 %27, label %_llgo_56, label %_llgo_57
 
@@ -1273,13 +1273,13 @@ _llgo_17:                                         ; preds = %_llgo_16
   br label %_llgo_18
 
 _llgo_18:                                         ; preds = %_llgo_17, %_llgo_16
-  %27 = load ptr, ptr @_llgo_uint8, align 8
+  %27 = load ptr, ptr @_llgo_byte, align 8
   %28 = icmp eq ptr %27, null
   br i1 %28, label %_llgo_19, label %_llgo_20
 
 _llgo_19:                                         ; preds = %_llgo_18
   %29 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 40)
-  store ptr %29, ptr @_llgo_uint8, align 8
+  store ptr %29, ptr @_llgo_byte, align 8
   br label %_llgo_20
 
 _llgo_20:                                         ; preds = %_llgo_19, %_llgo_18
diff --git a/cl/_testgo/goroutine/out.ll b/cl/_testgo/goroutine/out.ll
index bfc48cba..b91770c7 100644
--- a/cl/_testgo/goroutine/out.ll
+++ b/cl/_testgo/goroutine/out.ll
@@ -2,7 +2,6 @@
 source_filename = "main"
 
 %"github.com/goplus/llgo/internal/runtime.String" = type { ptr, i64 }
-%"github.com/goplus/llgo/c/pthread.RoutineFunc" = type { ptr, ptr }
 
 @"main.init$guard" = global i1 false, align 1
 @__llgo_argc = global i32 0, align 4
@@ -41,7 +40,7 @@ _llgo_0:
   %8 = getelementptr inbounds { { ptr, ptr }, %"github.com/goplus/llgo/internal/runtime.String" }, ptr %6, i32 0, i32 1
   store %"github.com/goplus/llgo/internal/runtime.String" { ptr @0, i64 16 }, ptr %8, align 8
   %9 = alloca i8, i64 8, align 1
-  %10 = call i32 @"github.com/goplus/llgo/internal/runtime.CreateThread"(ptr %9, ptr null, %"github.com/goplus/llgo/c/pthread.RoutineFunc" { ptr @"__llgo_stub.main._llgo_routine$1", ptr null }, ptr %6)
+  %10 = call i32 @"github.com/goplus/llgo/internal/runtime.CreateThread"(ptr %9, ptr null, ptr @"main._llgo_routine$1", ptr %6)
   br label %_llgo_3
 
 _llgo_1:                                          ; preds = %_llgo_3
@@ -88,13 +87,7 @@ _llgo_0:
 
 declare void @free(ptr)
 
-declare i32 @"github.com/goplus/llgo/internal/runtime.CreateThread"(ptr, ptr, %"github.com/goplus/llgo/c/pthread.RoutineFunc", ptr)
-
-define linkonce ptr @"__llgo_stub.main._llgo_routine$1"(ptr %0, ptr %1) {
-_llgo_0:
-  %2 = tail call ptr @"main._llgo_routine$1"(ptr %1)
-  ret ptr %2
-}
+declare i32 @"github.com/goplus/llgo/internal/runtime.CreateThread"(ptr, ptr, ptr, ptr)
 
 declare void @"github.com/goplus/llgo/internal/runtime.PrintString"(%"github.com/goplus/llgo/internal/runtime.String")
 
diff --git a/cl/_testgo/selects/out.ll b/cl/_testgo/selects/out.ll
index 595d2ce3..6196d5c7 100644
--- a/cl/_testgo/selects/out.ll
+++ b/cl/_testgo/selects/out.ll
@@ -1,7 +1,6 @@
 ; ModuleID = 'main'
 source_filename = "main"
 
-%"github.com/goplus/llgo/c/pthread.RoutineFunc" = type { ptr, ptr }
 %"github.com/goplus/llgo/internal/runtime.String" = type { ptr, i64 }
 %"github.com/goplus/llgo/internal/runtime.ChanOp" = type { ptr, ptr, i32, i1 }
 %"github.com/goplus/llgo/internal/runtime.Slice" = type { ptr, i64, i64 }
@@ -61,7 +60,7 @@ _llgo_0:
   %15 = getelementptr inbounds { { ptr, ptr } }, ptr %14, i32 0, i32 0
   store { ptr, ptr } %13, ptr %15, align 8
   %16 = alloca i8, i64 8, align 1
-  %17 = call i32 @"github.com/goplus/llgo/internal/runtime.CreateThread"(ptr %16, ptr null, %"github.com/goplus/llgo/c/pthread.RoutineFunc" { ptr @"__llgo_stub.main._llgo_routine$1", ptr null }, ptr %14)
+  %17 = call i32 @"github.com/goplus/llgo/internal/runtime.CreateThread"(ptr %16, ptr null, ptr @"main._llgo_routine$1", ptr %14)
   %18 = load ptr, ptr %2, align 8
   %19 = alloca {}, align 8
   call void @llvm.memset(ptr %19, i8 0, i64 0, i1 false)
@@ -230,13 +229,7 @@ _llgo_0:
 
 declare void @free(ptr)
 
-declare i32 @"github.com/goplus/llgo/internal/runtime.CreateThread"(ptr, ptr, %"github.com/goplus/llgo/c/pthread.RoutineFunc", ptr)
-
-define linkonce ptr @"__llgo_stub.main._llgo_routine$1"(ptr %0, ptr %1) {
-_llgo_0:
-  %2 = tail call ptr @"main._llgo_routine$1"(ptr %1)
-  ret ptr %2
-}
+declare i32 @"github.com/goplus/llgo/internal/runtime.CreateThread"(ptr, ptr, ptr, ptr)
 
 declare i1 @"github.com/goplus/llgo/internal/runtime.ChanSend"(ptr, ptr, i64)
 
diff --git a/cl/_testgo/syncmap/out.ll b/cl/_testgo/syncmap/out.ll
index b9327d67..1c8a0e79 100644
--- a/cl/_testgo/syncmap/out.ll
+++ b/cl/_testgo/syncmap/out.ll
@@ -1,161 +1 @@
-; ModuleID = 'main'
-source_filename = "main"
-
-%"github.com/goplus/llgo/internal/runtime.eface" = type { ptr, ptr }
-%"github.com/goplus/llgo/internal/runtime.String" = type { ptr, i64 }
-%"github.com/goplus/llgo/internal/runtime.Slice" = type { ptr, i64, i64 }
-%"github.com/goplus/llgo/internal/runtime.iface" = type { ptr, ptr }
-
-@"main.init$guard" = global i1 false, align 1
-@__llgo_argc = global i32 0, align 4
-@__llgo_argv = global ptr null, align 8
-@_llgo_int = linkonce global ptr null, align 8
-@0 = private unnamed_addr constant [5 x i8] c"hello", align 1
-@_llgo_string = linkonce global ptr null, align 8
-@1 = private unnamed_addr constant [1 x i8] c"1", align 1
-@_llgo_bool = linkonce global ptr null, align 8
-@2 = private unnamed_addr constant [7 x i8] c"%#v %v\0A", align 1
-
-define void @main.init() {
-_llgo_0:
-  %0 = load i1, ptr @"main.init$guard", align 1
-  br i1 %0, label %_llgo_2, label %_llgo_1
-
-_llgo_1:                                          ; preds = %_llgo_0
-  store i1 true, ptr @"main.init$guard", align 1
-  call void @fmt.init()
-  call void @sync.init()
-  call void @"main.init$after"()
-  br label %_llgo_2
-
-_llgo_2:                                          ; preds = %_llgo_1, %_llgo_0
-  ret void
-}
-
-define i32 @main(i32 %0, ptr %1) {
-_llgo_0:
-  store i32 %0, ptr @__llgo_argc, align 4
-  store ptr %1, ptr @__llgo_argv, align 8
-  call void @"github.com/goplus/llgo/internal/runtime.init"()
-  call void @main.init()
-  %2 = call ptr @"github.com/goplus/llgo/internal/runtime.AllocZ"(i64 32)
-  %3 = load ptr, ptr @_llgo_int, align 8
-  %4 = insertvalue %"github.com/goplus/llgo/internal/runtime.eface" undef, ptr %3, 0
-  %5 = insertvalue %"github.com/goplus/llgo/internal/runtime.eface" %4, ptr inttoptr (i64 1 to ptr), 1
-  %6 = load ptr, ptr @_llgo_string, align 8
-  %7 = call ptr @"github.com/goplus/llgo/internal/runtime.AllocU"(i64 16)
-  store %"github.com/goplus/llgo/internal/runtime.String" { ptr @0, i64 5 }, ptr %7, align 8
-  %8 = insertvalue %"github.com/goplus/llgo/internal/runtime.eface" undef, ptr %6, 0
-  %9 = insertvalue %"github.com/goplus/llgo/internal/runtime.eface" %8, ptr %7, 1
-  call void @"sync.(*Map).Store"(ptr %2, %"github.com/goplus/llgo/internal/runtime.eface" %5, %"github.com/goplus/llgo/internal/runtime.eface" %9)
-  %10 = load ptr, ptr @_llgo_string, align 8
-  %11 = call ptr @"github.com/goplus/llgo/internal/runtime.AllocU"(i64 16)
-  store %"github.com/goplus/llgo/internal/runtime.String" { ptr @1, i64 1 }, ptr %11, align 8
-  %12 = insertvalue %"github.com/goplus/llgo/internal/runtime.eface" undef, ptr %10, 0
-  %13 = insertvalue %"github.com/goplus/llgo/internal/runtime.eface" %12, ptr %11, 1
-  %14 = load ptr, ptr @_llgo_int, align 8
-  %15 = insertvalue %"github.com/goplus/llgo/internal/runtime.eface" undef, ptr %14, 0
-  %16 = insertvalue %"github.com/goplus/llgo/internal/runtime.eface" %15, ptr inttoptr (i64 100 to ptr), 1
-  call void @"sync.(*Map).Store"(ptr %2, %"github.com/goplus/llgo/internal/runtime.eface" %13, %"github.com/goplus/llgo/internal/runtime.eface" %16)
-  %17 = load ptr, ptr @_llgo_string, align 8
-  %18 = call ptr @"github.com/goplus/llgo/internal/runtime.AllocU"(i64 16)
-  store %"github.com/goplus/llgo/internal/runtime.String" { ptr @1, i64 1 }, ptr %18, align 8
-  %19 = insertvalue %"github.com/goplus/llgo/internal/runtime.eface" undef, ptr %17, 0
-  %20 = insertvalue %"github.com/goplus/llgo/internal/runtime.eface" %19, ptr %18, 1
-  %21 = call { %"github.com/goplus/llgo/internal/runtime.eface", i1 } @"sync.(*Map).Load"(ptr %2, %"github.com/goplus/llgo/internal/runtime.eface" %20)
-  %22 = extractvalue { %"github.com/goplus/llgo/internal/runtime.eface", i1 } %21, 0
-  %23 = extractvalue { %"github.com/goplus/llgo/internal/runtime.eface", i1 } %21, 1
-  %24 = call ptr @"github.com/goplus/llgo/internal/runtime.AllocZ"(i64 32)
-  %25 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %24, i64 0
-  store %"github.com/goplus/llgo/internal/runtime.eface" %22, ptr %25, align 8
-  %26 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %24, i64 1
-  %27 = load ptr, ptr @_llgo_bool, align 8
-  %28 = sext i1 %23 to i64
-  %29 = inttoptr i64 %28 to ptr
-  %30 = insertvalue %"github.com/goplus/llgo/internal/runtime.eface" undef, ptr %27, 0
-  %31 = insertvalue %"github.com/goplus/llgo/internal/runtime.eface" %30, ptr %29, 1
-  store %"github.com/goplus/llgo/internal/runtime.eface" %31, ptr %26, align 8
-  %32 = insertvalue %"github.com/goplus/llgo/internal/runtime.Slice" undef, ptr %24, 0
-  %33 = insertvalue %"github.com/goplus/llgo/internal/runtime.Slice" %32, i64 2, 1
-  %34 = insertvalue %"github.com/goplus/llgo/internal/runtime.Slice" %33, i64 2, 2
-  %35 = call { i64, %"github.com/goplus/llgo/internal/runtime.iface" } @fmt.Println(%"github.com/goplus/llgo/internal/runtime.Slice" %34)
-  call void @"sync.(*Map).Range"(ptr %2, { ptr, ptr } { ptr @"__llgo_stub.main.main$1", ptr null })
-  ret i32 0
-}
-
-define i1 @"main.main$1"(%"github.com/goplus/llgo/internal/runtime.eface" %0, %"github.com/goplus/llgo/internal/runtime.eface" %1) {
-_llgo_0:
-  %2 = call ptr @"github.com/goplus/llgo/internal/runtime.AllocZ"(i64 32)
-  %3 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %2, i64 0
-  store %"github.com/goplus/llgo/internal/runtime.eface" %0, ptr %3, align 8
-  %4 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %2, i64 1
-  store %"github.com/goplus/llgo/internal/runtime.eface" %1, ptr %4, align 8
-  %5 = insertvalue %"github.com/goplus/llgo/internal/runtime.Slice" undef, ptr %2, 0
-  %6 = insertvalue %"github.com/goplus/llgo/internal/runtime.Slice" %5, i64 2, 1
-  %7 = insertvalue %"github.com/goplus/llgo/internal/runtime.Slice" %6, i64 2, 2
-  %8 = call { i64, %"github.com/goplus/llgo/internal/runtime.iface" } @fmt.Printf(%"github.com/goplus/llgo/internal/runtime.String" { ptr @2, i64 7 }, %"github.com/goplus/llgo/internal/runtime.Slice" %7)
-  ret i1 true
-}
-
-declare void @fmt.init()
-
-declare void @sync.init()
-
-declare void @"github.com/goplus/llgo/internal/runtime.init"()
-
-declare ptr @"github.com/goplus/llgo/internal/runtime.AllocZ"(i64)
-
-declare void @"sync.(*Map).Store"(ptr, %"github.com/goplus/llgo/internal/runtime.eface", %"github.com/goplus/llgo/internal/runtime.eface")
-
-define void @"main.init$after"() {
-_llgo_0:
-  %0 = load ptr, ptr @_llgo_int, align 8
-  %1 = icmp eq ptr %0, null
-  br i1 %1, label %_llgo_1, label %_llgo_2
-
-_llgo_1:                                          ; preds = %_llgo_0
-  %2 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 34)
-  store ptr %2, ptr @_llgo_int, align 8
-  br label %_llgo_2
-
-_llgo_2:                                          ; preds = %_llgo_1, %_llgo_0
-  %3 = load ptr, ptr @_llgo_string, align 8
-  %4 = icmp eq ptr %3, null
-  br i1 %4, label %_llgo_3, label %_llgo_4
-
-_llgo_3:                                          ; preds = %_llgo_2
-  %5 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 24)
-  store ptr %5, ptr @_llgo_string, align 8
-  br label %_llgo_4
-
-_llgo_4:                                          ; preds = %_llgo_3, %_llgo_2
-  %6 = load ptr, ptr @_llgo_bool, align 8
-  %7 = icmp eq ptr %6, null
-  br i1 %7, label %_llgo_5, label %_llgo_6
-
-_llgo_5:                                          ; preds = %_llgo_4
-  %8 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 33)
-  store ptr %8, ptr @_llgo_bool, align 8
-  br label %_llgo_6
-
-_llgo_6:                                          ; preds = %_llgo_5, %_llgo_4
-  ret void
-}
-
-declare ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64)
-
-declare ptr @"github.com/goplus/llgo/internal/runtime.AllocU"(i64)
-
-declare { %"github.com/goplus/llgo/internal/runtime.eface", i1 } @"sync.(*Map).Load"(ptr, %"github.com/goplus/llgo/internal/runtime.eface")
-
-declare { i64, %"github.com/goplus/llgo/internal/runtime.iface" } @fmt.Println(%"github.com/goplus/llgo/internal/runtime.Slice")
-
-declare void @"sync.(*Map).Range"(ptr, { ptr, ptr })
-
-define linkonce i1 @"__llgo_stub.main.main$1"(ptr %0, %"github.com/goplus/llgo/internal/runtime.eface" %1, %"github.com/goplus/llgo/internal/runtime.eface" %2) {
-_llgo_0:
-  %3 = tail call i1 @"main.main$1"(%"github.com/goplus/llgo/internal/runtime.eface" %1, %"github.com/goplus/llgo/internal/runtime.eface" %2)
-  ret i1 %3
-}
-
-declare { i64, %"github.com/goplus/llgo/internal/runtime.iface" } @fmt.Printf(%"github.com/goplus/llgo/internal/runtime.String", %"github.com/goplus/llgo/internal/runtime.Slice")
+;
\ No newline at end of file
diff --git a/cl/_testlibgo/atomic/out.ll b/cl/_testlibgo/atomic/out.ll
index e206c8c2..765b0452 100644
--- a/cl/_testlibgo/atomic/out.ll
+++ b/cl/_testlibgo/atomic/out.ll
@@ -32,8 +32,8 @@ _llgo_0:
   call void @"github.com/goplus/llgo/internal/runtime.init"()
   call void @main.init()
   %2 = call ptr @"github.com/goplus/llgo/internal/runtime.AllocZ"(i64 8)
-  call void @"sync/atomic.StoreInt64"(ptr %2, i64 100)
-  %3 = call i64 @"sync/atomic.LoadInt64"(ptr %2)
+  store atomic i64 100, ptr %2 seq_cst, align 4
+  %3 = load atomic i64, ptr %2 seq_cst, align 4
   call void @"github.com/goplus/llgo/internal/runtime.PrintString"(%"github.com/goplus/llgo/internal/runtime.String" { ptr @0, i64 6 })
   call void @"github.com/goplus/llgo/internal/runtime.PrintByte"(i8 32)
   call void @"github.com/goplus/llgo/internal/runtime.PrintInt"(i64 %3)
@@ -87,10 +87,6 @@ declare void @"github.com/goplus/llgo/internal/runtime.init"()
 
 declare ptr @"github.com/goplus/llgo/internal/runtime.AllocZ"(i64)
 
-declare void @"sync/atomic.StoreInt64"(ptr, i64)
-
-declare i64 @"sync/atomic.LoadInt64"(ptr)
-
 declare void @"github.com/goplus/llgo/internal/runtime.PrintString"(%"github.com/goplus/llgo/internal/runtime.String")
 
 declare void @"github.com/goplus/llgo/internal/runtime.PrintByte"(i8)
diff --git a/cl/_testlibgo/complex/out.ll b/cl/_testlibgo/complex/out.ll
index d89ac2fb..a7c5af4e 100644
--- a/cl/_testlibgo/complex/out.ll
+++ b/cl/_testlibgo/complex/out.ll
@@ -12,7 +12,7 @@ source_filename = "main"
 
 define void @main.f({ double, double } %0, { double, double } %1) {
 _llgo_0:
-  %2 = call double @"math/cmplx.Abs"({ double, double } %0)
+  %2 = call double @cabs({ double, double } %0)
   call void @"github.com/goplus/llgo/internal/runtime.PrintString"(%"github.com/goplus/llgo/internal/runtime.String" { ptr @0, i64 10 })
   call void @"github.com/goplus/llgo/internal/runtime.PrintByte"(i8 32)
   call void @"github.com/goplus/llgo/internal/runtime.PrintFloat"(double %2)
@@ -54,7 +54,7 @@ _llgo_0:
   ret i32 0
 }
 
-declare double @"math/cmplx.Abs"({ double, double })
+declare double @cabs({ double, double })
 
 declare void @"github.com/goplus/llgo/internal/runtime.PrintString"(%"github.com/goplus/llgo/internal/runtime.String")
 
diff --git a/cl/_testlibgo/math/out.ll b/cl/_testlibgo/math/out.ll
index e7ee0e64..deb4b57e 100644
--- a/cl/_testlibgo/math/out.ll
+++ b/cl/_testlibgo/math/out.ll
@@ -25,7 +25,7 @@ _llgo_0:
   store ptr %1, ptr @__llgo_argv, align 8
   call void @"github.com/goplus/llgo/internal/runtime.init"()
   call void @main.init()
-  %2 = call double @math.Sqrt(double 2.000000e+00)
+  %2 = call double @sqrt(double 2.000000e+00)
   call void @"github.com/goplus/llgo/internal/runtime.PrintFloat"(double %2)
   call void @"github.com/goplus/llgo/internal/runtime.PrintByte"(i8 10)
   %3 = call double @math.Abs(double -1.200000e+00)
@@ -41,7 +41,7 @@ declare void @math.init()
 
 declare void @"github.com/goplus/llgo/internal/runtime.init"()
 
-declare double @math.Sqrt(double)
+declare double @sqrt(double)
 
 declare void @"github.com/goplus/llgo/internal/runtime.PrintFloat"(double)
 
diff --git a/cl/_testpy/callpy/out.ll b/cl/_testpy/callpy/out.ll
index 25ccfebb..484cf44e 100644
--- a/cl/_testpy/callpy/out.ll
+++ b/cl/_testpy/callpy/out.ll
@@ -40,7 +40,6 @@ _llgo_2:                                          ; preds = %_llgo_1, %_llgo_0
 
 define i32 @main(i32 %0, ptr %1) {
 _llgo_0:
-  call void @Py_Initialize()
   store i32 %0, ptr @__llgo_argc, align 4
   store ptr %1, ptr @__llgo_argv, align 8
   call void @"github.com/goplus/llgo/internal/runtime.init"()
@@ -81,5 +80,3 @@ declare ptr @PyUnicode_FromString(ptr)
 declare ptr @PyObject_CallFunctionObjArgs(ptr, ...)
 
 declare void @llgoLoadPyModSyms(ptr, ...)
-
-declare void @Py_Initialize()
diff --git a/cl/_testpy/gcd/out.ll b/cl/_testpy/gcd/out.ll
index fbc24887..0fdec606 100644
--- a/cl/_testpy/gcd/out.ll
+++ b/cl/_testpy/gcd/out.ll
@@ -27,7 +27,6 @@ _llgo_2:                                          ; preds = %_llgo_1, %_llgo_0
 
 define i32 @main(i32 %0, ptr %1) {
 _llgo_0:
-  call void @Py_Initialize()
   store i32 %0, ptr @__llgo_argc, align 4
   store ptr %1, ptr @__llgo_argv, align 8
   call void @"github.com/goplus/llgo/internal/runtime.init"()
@@ -55,5 +54,3 @@ declare i64 @PyLong_AsLong(ptr)
 declare i32 @printf(ptr, ...)
 
 declare void @llgoLoadPyModSyms(ptr, ...)
-
-declare void @Py_Initialize()
diff --git a/cl/_testpy/math/out.ll b/cl/_testpy/math/out.ll
index 746b550c..9eeddcbc 100644
--- a/cl/_testpy/math/out.ll
+++ b/cl/_testpy/math/out.ll
@@ -1,17 +1,17 @@
-; ModuleID = 'math'
-source_filename = "math"
+; ModuleID = 'github.com/goplus/llgo/cl/_testpy/math'
+source_filename = "github.com/goplus/llgo/cl/_testpy/math"
 
-@"math.init$guard" = global i1 false, align 1
+@"github.com/goplus/llgo/cl/_testpy/math.init$guard" = global i1 false, align 1
 @__llgo_py.math = linkonce global ptr null, align 8
 @0 = private unnamed_addr constant [5 x i8] c"math\00", align 1
 
-define void @math.init() {
+define void @"github.com/goplus/llgo/cl/_testpy/math.init"() {
 _llgo_0:
-  %0 = load i1, ptr @"math.init$guard", align 1
+  %0 = load i1, ptr @"github.com/goplus/llgo/cl/_testpy/math.init$guard", align 1
   br i1 %0, label %_llgo_2, label %_llgo_1
 
 _llgo_1:                                          ; preds = %_llgo_0
-  store i1 true, ptr @"math.init$guard", align 1
+  store i1 true, ptr @"github.com/goplus/llgo/cl/_testpy/math.init$guard", align 1
   %1 = load ptr, ptr @__llgo_py.math, align 8
   %2 = icmp ne ptr %1, null
   br i1 %2, label %_llgo_2, label %_llgo_3
diff --git a/cl/_testpy/matrix/out.ll b/cl/_testpy/matrix/out.ll
index 20548694..7fe94c57 100644
--- a/cl/_testpy/matrix/out.ll
+++ b/cl/_testpy/matrix/out.ll
@@ -29,7 +29,6 @@ _llgo_2:                                          ; preds = %_llgo_1, %_llgo_0
 
 define i32 @main(i32 %0, ptr %1) {
 _llgo_0:
-  call void @Py_Initialize()
   store i32 %0, ptr @__llgo_argc, align 4
   store ptr %1, ptr @__llgo_argv, align 8
   call void @"github.com/goplus/llgo/internal/runtime.init"()
@@ -117,5 +116,3 @@ declare ptr @PyUnicode_AsUTF8(ptr)
 declare i32 @printf(ptr, ...)
 
 declare void @llgoLoadPyModSyms(ptr, ...)
-
-declare void @Py_Initialize()
diff --git a/cl/_testpy/max/out.ll b/cl/_testpy/max/out.ll
index 3eae5bed..46b66d48 100644
--- a/cl/_testpy/max/out.ll
+++ b/cl/_testpy/max/out.ll
@@ -30,7 +30,6 @@ _llgo_2:                                          ; preds = %_llgo_1, %_llgo_0
 
 define i32 @main(i32 %0, ptr %1) {
 _llgo_0:
-  call void @Py_Initialize()
   store i32 %0, ptr @__llgo_argc, align 4
   store ptr %1, ptr @__llgo_argv, align 8
   call void @"github.com/goplus/llgo/internal/runtime.init"()
@@ -93,5 +92,3 @@ declare ptr @PyTuple_New(i64)
 declare i32 @PyTuple_SetItem(ptr, i64, ptr)
 
 declare void @llgoLoadPyModSyms(ptr, ...)
-
-declare void @Py_Initialize()
diff --git a/cl/_testpy/pi/out.ll b/cl/_testpy/pi/out.ll
index 0a6225de..083e6d54 100644
--- a/cl/_testpy/pi/out.ll
+++ b/cl/_testpy/pi/out.ll
@@ -24,7 +24,6 @@ _llgo_2:                                          ; preds = %_llgo_1, %_llgo_0
 
 define i32 @main(i32 %0, ptr %1) {
 _llgo_0:
-  call void @Py_Initialize()
   store i32 %0, ptr @__llgo_argc, align 4
   store ptr %1, ptr @__llgo_argv, align 8
   call void @"github.com/goplus/llgo/internal/runtime.init"()
@@ -45,5 +44,3 @@ declare ptr @PyObject_GetAttrString(ptr, ptr)
 declare double @PyFloat_AsDouble(ptr)
 
 declare i32 @printf(ptr, ...)
-
-declare void @Py_Initialize()
diff --git a/cl/_testpy/pow/out.ll b/cl/_testpy/pow/out.ll
index 5807c6f3..29ee34d2 100644
--- a/cl/_testpy/pow/out.ll
+++ b/cl/_testpy/pow/out.ll
@@ -27,7 +27,6 @@ _llgo_2:                                          ; preds = %_llgo_1, %_llgo_0
 
 define i32 @main(i32 %0, ptr %1) {
 _llgo_0:
-  call void @Py_Initialize()
   store i32 %0, ptr @__llgo_argc, align 4
   store ptr %1, ptr @__llgo_argv, align 8
   call void @"github.com/goplus/llgo/internal/runtime.init"()
@@ -54,5 +53,3 @@ declare double @PyFloat_AsDouble(ptr)
 declare i32 @printf(ptr, ...)
 
 declare void @llgoLoadPyModSyms(ptr, ...)
-
-declare void @Py_Initialize()
diff --git a/cl/cltest/cltest.go b/cl/cltest/cltest.go
index 821f51a8..5bfde54f 100644
--- a/cl/cltest/cltest.go
+++ b/cl/cltest/cltest.go
@@ -50,7 +50,7 @@ func InitDebug() {
 	llssa.SetDebug(llssa.DbgFlagAll)
 }
 
-func FromDir(t *testing.T, sel, relDir string, byLLGen bool) {
+func FromDir(t *testing.T, sel, relDir string) {
 	dir, err := os.Getwd()
 	if err != nil {
 		t.Fatal("Getwd failed:", err)
@@ -66,7 +66,7 @@ func FromDir(t *testing.T, sel, relDir string, byLLGen bool) {
 			continue
 		}
 		t.Run(name, func(t *testing.T) {
-			testFrom(t, dir+"/"+name, sel, byLLGen)
+			testFrom(t, dir+"/"+name, sel)
 		})
 	}
 }
@@ -107,44 +107,19 @@ func Pkg(t *testing.T, pkgPath, outFile string) {
 	}
 }
 
-func isDbgSymEnabled(flagsFile string) bool {
-	data, err := os.ReadFile(flagsFile)
-	if err != nil {
-		return false
-	}
-	toks := strings.Split(strings.Join(strings.Split(string(data), "\n"), " "), " ")
-	for _, tok := range toks {
-		if tok == "-dbg" {
-			return true
-		}
-	}
-	return false
-}
-
-func testFrom(t *testing.T, pkgDir, sel string, byLLGen bool) {
+func testFrom(t *testing.T, pkgDir, sel string) {
 	if sel != "" && !strings.Contains(pkgDir, sel) {
 		return
 	}
 	log.Println("Parsing", pkgDir)
-	in := pkgDir + "/in.go"
 	out := pkgDir + "/out.ll"
-	dbg := isDbgSymEnabled(pkgDir + "/flags.txt")
-	if dbg {
-		cl.EnableDebugSymbols(true)
-		defer cl.EnableDebugSymbols(false)
-		cl.DebugSymbols() // just for coverage
-	}
 	b, err := os.ReadFile(out)
 	if err != nil {
 		t.Fatal("ReadFile failed:", err)
 	}
 	expected := string(b)
-	if byLLGen {
-		if v := llgen.GenFrom(in); v != expected && expected != ";" { // expected == ";" means skipping out.ll
-			t.Fatalf("\n==> got:\n%s\n==> expected:\n%s\n", v, expected)
-		}
-	} else {
-		TestCompileEx(t, nil, in, expected, dbg)
+	if v := llgen.GenFrom(pkgDir); v != expected && expected != ";" { // expected == ";" means skipping out.ll
+		t.Fatalf("\n==> got:\n%s\n==> expected:\n%s\n", v, expected)
 	}
 }
 
diff --git a/cl/compile.go b/cl/compile.go
index 305bf1cb..f4949b74 100644
--- a/cl/compile.go
+++ b/cl/compile.go
@@ -57,15 +57,10 @@ func SetDebug(dbgFlags dbgFlags) {
 	debugGoSSA = (dbgFlags & DbgFlagGoSSA) != 0
 }
 
-// EnableDebugSymbols enables debug symbols.
 func EnableDebugSymbols(b bool) {
 	debugSymbols = b
 }
 
-func DebugSymbols() bool {
-	return debugSymbols
-}
-
 // -----------------------------------------------------------------------------
 
 type instrOrValue interface {
diff --git a/cl/compile_test.go b/cl/compile_test.go
index 47f1773c..4618ffef 100644
--- a/cl/compile_test.go
+++ b/cl/compile_test.go
@@ -30,34 +30,37 @@ func testCompile(t *testing.T, src, expected string) {
 }
 
 func TestFromTestgo(t *testing.T) {
-	cltest.FromDir(t, "", "./_testgo", false)
+	cltest.FromDir(t, "", "./_testgo")
 }
 
 func TestFromTestpy(t *testing.T) {
-	cltest.FromDir(t, "", "./_testpy", false)
+	cltest.FromDir(t, "", "./_testpy")
 }
 
 func TestFromTestlibgo(t *testing.T) {
-	cltest.FromDir(t, "", "./_testlibgo", true)
+	cltest.FromDir(t, "", "./_testlibgo")
 }
 
 func TestFromTestlibc(t *testing.T) {
-	cltest.FromDir(t, "", "./_testlibc", true)
+	cltest.FromDir(t, "", "./_testlibc")
 }
 
 func TestFromTestrt(t *testing.T) {
 	cl.SetDebug(cl.DbgFlagAll)
-	cltest.FromDir(t, "", "./_testrt", true)
+	cltest.FromDir(t, "", "./_testrt")
 	cl.SetDebug(0)
 }
 
 func TestFromTestdata(t *testing.T) {
-	cltest.FromDir(t, "", "./_testdata", false)
+	cltest.FromDir(t, "", "./_testdata")
 }
 
 func TestGoPkgMath(t *testing.T) {
 	conf := build.NewDefaultConf(build.ModeInstall)
-	build.Do([]string{"math"}, conf)
+	_, err := build.Do([]string{"math"}, conf)
+	if err != nil {
+		t.Fatal(err)
+	}
 }
 
 func TestVar(t *testing.T) {
diff --git a/cmd/internal/build/build.go b/cmd/internal/build/build.go
index 67915c4a..c578a8ee 100644
--- a/cmd/internal/build/build.go
+++ b/cmd/internal/build/build.go
@@ -18,6 +18,9 @@
 package build
 
 import (
+	"fmt"
+	"os"
+
 	"github.com/goplus/llgo/cmd/internal/base"
 	"github.com/goplus/llgo/internal/build"
 )
@@ -41,5 +44,9 @@ func runCmd(cmd *base.Command, args []string) {
 		conf.OutFile = args[1]
 		args = args[2:]
 	}
-	build.Do(args, conf)
+	_, err := build.Do(args, conf)
+	if err != nil {
+		fmt.Fprintln(os.Stderr, err)
+		os.Exit(1)
+	}
 }
diff --git a/cmd/internal/install/install.go b/cmd/internal/install/install.go
index c486abb3..5c0f5621 100644
--- a/cmd/internal/install/install.go
+++ b/cmd/internal/install/install.go
@@ -18,6 +18,9 @@
 package install
 
 import (
+	"fmt"
+	"os"
+
 	"github.com/goplus/llgo/cmd/internal/base"
 	"github.com/goplus/llgo/internal/build"
 )
@@ -34,5 +37,9 @@ func init() {
 
 func runCmd(cmd *base.Command, args []string) {
 	conf := build.NewDefaultConf(build.ModeInstall)
-	build.Do(args, conf)
+	_, err := build.Do(args, conf)
+	if err != nil {
+		fmt.Fprintln(os.Stderr, err)
+		os.Exit(1)
+	}
 }
diff --git a/cmd/internal/run/run.go b/cmd/internal/run/run.go
index 3317cfad..2b5ff2ad 100644
--- a/cmd/internal/run/run.go
+++ b/cmd/internal/run/run.go
@@ -19,6 +19,8 @@ package run
 
 import (
 	"errors"
+	"fmt"
+	"os"
 	"path/filepath"
 
 	"github.com/goplus/llgo/cmd/internal/base"
@@ -63,7 +65,11 @@ func runCmdEx(_ *base.Command, args []string, mode build.Mode) {
 	args, runArgs, err := parseRunArgs(args)
 	check(err)
 	conf.RunArgs = runArgs
-	build.Do(args, conf)
+	_, err = build.Do(args, conf)
+	if err != nil {
+		fmt.Fprintln(os.Stderr, err)
+		os.Exit(1)
+	}
 }
 
 func parseRunArgs(args []string) ([]string, []string, error) {
diff --git a/cpp/llvm/llvm.go b/cpp/llvm/llvm.go
index f43e9a93..f0b1ca6f 100644
--- a/cpp/llvm/llvm.go
+++ b/cpp/llvm/llvm.go
@@ -19,7 +19,7 @@ package llvm
 // -----------------------------------------------------------------------------
 
 const (
-	LLGoPackage = "link: -L$(llvm-config --libdir) -lLLVM; -lLLVM"
+	LLGoPackage = "link: -L$(llvm-config --libs) $(llvm-config --ldflags); -lLLVM"
 )
 
 // StringView represents a C++ std::string_view object.
diff --git a/doc/_readme/scripts/install_macos.sh b/doc/_readme/scripts/install_macos.sh
index 9892979d..20cd3a47 100644
--- a/doc/_readme/scripts/install_macos.sh
+++ b/doc/_readme/scripts/install_macos.sh
@@ -1,5 +1,6 @@
 # shellcheck disable=all
 brew update
-brew install llvm@18 pkg-config bdw-gc openssl cjson
+brew install llvm@18 bdw-gc openssl cjson libffi
 brew install python@3.12 # optional
-go install -v github.com/goplus/llgo/cmd/llgo@latest
\ No newline at end of file
+brew link --force libffi
+go install -v github.com/goplus/llgo/cmd/llgo@latest
diff --git a/doc/_readme/scripts/install_ubuntu.sh b/doc/_readme/scripts/install_ubuntu.sh
index 069e6170..b36e42d7 100644
--- a/doc/_readme/scripts/install_ubuntu.sh
+++ b/doc/_readme/scripts/install_ubuntu.sh
@@ -2,6 +2,6 @@
 echo "deb http://apt.llvm.org/$(lsb_release -cs)/ llvm-toolchain-$(lsb_release -cs)-18 main" | sudo tee /etc/apt/sources.list.d/llvm.list
 wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | sudo apt-key add -
 sudo apt-get update
-sudo apt-get install -y llvm-18-dev clang-18 libclang-18-dev lld-18 pkg-config libgc-dev libssl-dev zlib1g-dev libcjson-dev python3.12-dev
+sudo apt-get install -y llvm-18-dev clang-18 libclang-18-dev lld-18 pkg-config libgc-dev libssl-dev zlib1g-dev libcjson-dev libsqlite3-dev
 sudo apt-get install -y python3.12-dev # optional
 go install -v github.com/goplus/llgo/cmd/llgo@latest
\ No newline at end of file
diff --git a/internal/build/build.go b/internal/build/build.go
index 4eec5338..e12e57eb 100644
--- a/internal/build/build.go
+++ b/internal/build/build.go
@@ -53,6 +53,7 @@ const (
 	ModeInstall
 	ModeRun
 	ModeCmpTest
+	ModeGen
 )
 
 const (
@@ -119,9 +120,8 @@ const (
 	loadSyntax  = loadTypes | packages.NeedSyntax | packages.NeedTypesInfo
 )
 
-func Do(args []string, conf *Config) {
+func Do(args []string, conf *Config) ([]Package, error) {
 	flags, patterns, verbose := ParseArgs(args, buildFlags)
-	cl.EnableDebugSymbols(IsDebugEnabled())
 	flags = append(flags, "-tags", "llgo")
 	cfg := &packages.Config{
 		Mode:       loadSyntax | packages.NeedDeps | packages.NeedModule | packages.NeedExportFile,
@@ -137,6 +137,7 @@ func Do(args []string, conf *Config) {
 		}
 	}
 
+	cl.EnableDebugSymbols(IsDebugEnabled())
 	llssa.Initialize(llssa.InitAll)
 
 	target := &llssa.Target{
@@ -159,7 +160,6 @@ func Do(args []string, conf *Config) {
 	}
 	initial, err := packages.LoadEx(dedup, sizes, cfg, patterns...)
 	check(err)
-
 	mode := conf.Mode
 	if len(initial) == 1 && len(initial[0].CompiledGoFiles) > 0 {
 		if mode == ModeBuild {
@@ -167,11 +167,10 @@ func Do(args []string, conf *Config) {
 		}
 	} else if mode == ModeRun {
 		if len(initial) > 1 {
-			fmt.Fprintln(os.Stderr, "cannot run multiple packages")
+			return nil, fmt.Errorf("cannot run multiple packages")
 		} else {
-			fmt.Fprintln(os.Stderr, "no Go files in matched packages")
+			return nil, fmt.Errorf("no Go files in matched packages")
 		}
-		return
 	}
 
 	altPkgPaths := altPkgs(initial, llssa.PkgRuntime)
@@ -188,7 +187,7 @@ func Do(args []string, conf *Config) {
 	})
 
 	buildMode := ssaBuildMode
-	if cl.DebugSymbols() {
+	if IsDebugEnabled() {
 		buildMode |= ssa.GlobalDebug
 	}
 	if !IsOptimizeEnabled() {
@@ -203,12 +202,21 @@ func Do(args []string, conf *Config) {
 
 	ctx := &context{env, cfg, progSSA, prog, dedup, patches, make(map[string]none), initial, mode, 0}
 	pkgs := buildAllPkgs(ctx, initial, verbose)
+	if mode == ModeGen {
+		for _, pkg := range pkgs {
+			if pkg.Package == initial[0] {
+				return []*aPackage{pkg}, nil
+			}
+		}
+		return nil, fmt.Errorf("initial package not found")
+	}
 
 	dpkg := buildAllPkgs(ctx, altPkgs[noRt:], verbose)
 	var linkArgs []string
 	for _, pkg := range dpkg {
 		linkArgs = append(linkArgs, pkg.LinkArgs...)
 	}
+
 	if mode != ModeBuild {
 		nErr := 0
 		for _, pkg := range initial {
@@ -220,6 +228,7 @@ func Do(args []string, conf *Config) {
 			os.Exit(nErr)
 		}
 	}
+	return dpkg, nil
 }
 
 func setNeedRuntimeOrPyInit(pkg *packages.Package, needRuntime, needPyInit bool) {
@@ -451,7 +460,7 @@ func linkMainPkg(ctx *context, pkg *packages.Package, pkgs []*aPackage, linkArgs
 		}
 	}
 	args = append(args, exargs...)
-	if cl.DebugSymbols() {
+	if IsDebugEnabled() {
 		args = append(args, "-gdwarf-4")
 	}
 
@@ -571,6 +580,8 @@ type aPackage struct {
 	LinkArgs []string
 }
 
+type Package = *aPackage
+
 func allPkgs(ctx *context, initial []*packages.Package, verbose bool) (all []*aPackage, errs []*packages.Package) {
 	prog := ctx.progSSA
 	built := ctx.built
diff --git a/internal/llgen/llgen.go b/internal/llgen/llgen.go
index 14440c42..7401ebe5 100644
--- a/internal/llgen/llgen.go
+++ b/internal/llgen/llgen.go
@@ -16,41 +16,8 @@
 
 package llgen
 
-import (
-	"os"
-
-	"github.com/goplus/llgo/cl"
-	"github.com/goplus/llgo/internal/build"
-	"github.com/goplus/llgo/internal/mod"
-
-	llssa "github.com/goplus/llgo/ssa"
-)
-
-func Init() {
-	llssa.Initialize(llssa.InitAll)
-	llssa.SetDebug(llssa.DbgFlagAll)
-	cl.SetDebug(cl.DbgFlagAll)
-	cl.EnableDebugSymbols(build.IsDebugEnabled())
-}
-
-func PkgPath(dir string) string {
-	_, pkgPath, err := mod.Load(dir)
-	check(err)
-	return pkgPath
-}
-
-func Do(pkgPath, inFile, outFile string) {
-	ret := genFrom(inFile, pkgPath)
-	err := os.WriteFile(outFile, []byte(ret), 0644)
-	check(err)
-}
-
 func check(err error) {
 	if err != nil {
 		panic(err)
 	}
 }
-
-var (
-	Verbose = true
-)
diff --git a/internal/llgen/llgenf.go b/internal/llgen/llgenf.go
index cf55c856..e7f8cc83 100644
--- a/internal/llgen/llgenf.go
+++ b/internal/llgen/llgenf.go
@@ -17,107 +17,37 @@
 package llgen
 
 import (
-	"go/ast"
-	"go/types"
 	"os"
 	"os/exec"
 	"path/filepath"
 	"strings"
 
-	"github.com/goplus/llgo/cl"
 	"github.com/goplus/llgo/internal/build"
-	"github.com/goplus/llgo/internal/packages"
-	"golang.org/x/tools/go/ssa"
-	"golang.org/x/tools/go/ssa/ssautil"
-
-	llssa "github.com/goplus/llgo/ssa"
 )
 
-const (
-	loadFiles   = packages.NeedName | packages.NeedFiles | packages.NeedCompiledGoFiles
-	loadImports = loadFiles | packages.NeedImports
-	loadTypes   = loadImports | packages.NeedTypes | packages.NeedTypesSizes
-	loadSyntax  = loadTypes | packages.NeedSyntax | packages.NeedTypesInfo
-)
-
-func initRtAndPy(prog llssa.Program, cfg *packages.Config) {
-	var pkgRtAndPy []*packages.Package
-	load := func() []*packages.Package {
-		if pkgRtAndPy == nil {
-			var err error
-			pkgRtAndPy, err = packages.LoadEx(nil, prog.TypeSizes, cfg, llssa.PkgRuntime, llssa.PkgPython)
-			check(err)
-		}
-		return pkgRtAndPy
-	}
-
-	prog.SetRuntime(func() *types.Package {
-		rt := load()
-		return rt[0].Types
-	})
-	prog.SetPython(func() *types.Package {
-		rt := load()
-		return rt[1].Types
-	})
-}
-
 func GenFrom(fileOrPkg string) string {
-	return genFrom(fileOrPkg, "")
+	pkg, err := genFrom(fileOrPkg)
+	check(err)
+	return pkg.LPkg.String()
 }
 
-func genFrom(fileOrPkg string, pkgPath string) string {
-	prog := llssa.NewProgram(nil)
-
-	cfg := &packages.Config{
-		Mode:       loadSyntax | packages.NeedDeps,
-		BuildFlags: []string{"-tags", "llgo"},
+func genFrom(pkgPath string) (build.Package, error) {
+	oldDbg := os.Getenv("LLGO_DEBUG")
+	dbg := isDbgSymEnabled(filepath.Join(pkgPath, "flags.txt"))
+	if dbg {
+		os.Setenv("LLGO_DEBUG", "1")
 	}
+	defer os.Setenv("LLGO_DEBUG", oldDbg)
 
-	dedup := packages.NewDeduper()
-	dedup.SetPkgPath(func(path, name string) string {
-		if path == "command-line-arguments" {
-			if pkgPath != "" {
-				path = pkgPath
-			} else {
-				path = name
-			}
-		}
-		return path
-	})
-	dedup.SetPreload(func(pkg *types.Package, files []*ast.File) {
-		cl.ParsePkgSyntax(prog, pkg, files)
-	})
-
-	initial, err := packages.LoadEx(dedup, prog.TypeSizes, cfg, fileOrPkg)
-	check(err)
-
-	buildMode := ssa.SanityCheckFunctions | ssa.InstantiateGenerics
-	if build.IsDebugEnabled() {
-		buildMode |= ssa.GlobalDebug
+	conf := &build.Config{
+		Mode:   build.ModeGen,
+		AppExt: build.DefaultAppExt(),
 	}
-	if !build.IsOptimizeEnabled() {
-		buildMode |= ssa.NaiveForm
+	pkgs, err := build.Do([]string{pkgPath}, conf)
+	if err != nil {
+		return nil, err
 	}
-	_, pkgs := ssautil.AllPackages(initial, buildMode)
-
-	pkg := initial[0]
-	ssaPkg := pkgs[0]
-	ssaPkg.Build()
-
-	initRtAndPy(prog, cfg)
-
-	if Verbose {
-		ssaPkg.WriteTo(os.Stderr)
-	}
-
-	ret, err := cl.NewPackage(prog, ssaPkg, pkg.Syntax)
-	check(err)
-
-	if prog.NeedPyInit { // call PyInit if needed
-		ret.PyInit()
-	}
-
-	return ret.String()
+	return pkgs[0], nil
 }
 
 func DoFile(fileOrPkg, outFile string) {
@@ -126,9 +56,26 @@ func DoFile(fileOrPkg, outFile string) {
 	check(err)
 }
 
-func SmartDoFile(inFile string, pkgPath ...string) {
+func isDbgSymEnabled(flagsFile string) bool {
+	data, err := os.ReadFile(flagsFile)
+	if err != nil {
+		return false
+	}
+	toks := strings.Split(strings.Join(strings.Split(string(data), "\n"), " "), " ")
+	for _, tok := range toks {
+		if tok == "-dbg" {
+			return true
+		}
+	}
+	return false
+}
+
+func SmartDoFile(pkgPath string) {
+	pkg, err := genFrom(pkgPath)
+	check(err)
+
 	const autgenFile = "llgo_autogen.ll"
-	dir, _ := filepath.Split(inFile)
+	dir, _ := filepath.Split(pkg.GoFiles[0])
 	absDir, _ := filepath.Abs(dir)
 	absDir = filepath.ToSlash(absDir)
 	fname := autgenFile
@@ -142,10 +89,8 @@ func SmartDoFile(inFile string, pkgPath ...string) {
 		return // skip to gen
 	}
 
-	if len(pkgPath) > 0 {
-		Do(pkgPath[0], inFile, outFile)
-	} else {
-		DoFile(inFile, outFile)
+	if err = os.WriteFile(outFile, []byte(pkg.LPkg.String()), 0644); err != nil {
+		panic(err)
 	}
 	if false && fname == autgenFile {
 		genZip(absDir, "llgo_autogen.lla", autgenFile)
diff --git a/ssa/cl_test.go b/ssa/cl_test.go
index 837a990a..86928f5f 100644
--- a/ssa/cl_test.go
+++ b/ssa/cl_test.go
@@ -30,27 +30,27 @@ func init() {
 }
 
 func TestFromTestlibgo(t *testing.T) {
-	cltest.FromDir(t, "", "../cl/_testlibgo", false)
+	cltest.FromDir(t, "", "../cl/_testlibgo")
 }
 
 func TestFromTestgo(t *testing.T) {
-	cltest.FromDir(t, "", "../cl/_testgo", false)
+	cltest.FromDir(t, "", "../cl/_testgo")
 }
 
 func TestFromTestpy(t *testing.T) {
-	cltest.FromDir(t, "", "../cl/_testpy", false)
+	cltest.FromDir(t, "", "../cl/_testpy")
 }
 
 func TestFromTestlibc(t *testing.T) {
-	cltest.FromDir(t, "", "../cl/_testlibc", true)
+	cltest.FromDir(t, "", "../cl/_testlibc")
 }
 
 func TestFromTestrt(t *testing.T) {
-	cltest.FromDir(t, "", "../cl/_testrt", true)
+	cltest.FromDir(t, "", "../cl/_testrt")
 }
 
 func TestFromTestdata(t *testing.T) {
-	cltest.FromDir(t, "", "../cl/_testdata", false)
+	cltest.FromDir(t, "", "../cl/_testdata")
 }
 
 func TestMakeInterface(t *testing.T) {