diff --git a/chore/gentests/gentests.go b/chore/gentests/gentests.go
index 480a3854..6cd06ba5 100644
--- a/chore/gentests/gentests.go
+++ b/chore/gentests/gentests.go
@@ -21,7 +21,6 @@ import (
 	"os"
 	"strings"
 
-	"github.com/goplus/llgo/cl"
 	"github.com/goplus/llgo/internal/llgen"
 	"github.com/goplus/mod"
 )
@@ -38,20 +37,6 @@ func main() {
 	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) {
 	fis, err := os.ReadDir(dir)
 	check(err)
@@ -63,8 +48,6 @@ func llgenDir(dir string) {
 		testDir := dir + "/" + name
 		fmt.Fprintln(os.Stderr, "llgen", testDir)
 		check(os.Chdir(testDir))
-		dbg := isDbgSymEnabled("flags.txt")
-		cl.EnableDebugSymbols(dbg)
 		llgen.SmartDoFile(testDir)
 	}
 }
diff --git a/cl/cltest/cltest.go b/cl/cltest/cltest.go
index 15c05185..5bfde54f 100644
--- a/cl/cltest/cltest.go
+++ b/cl/cltest/cltest.go
@@ -107,32 +107,12 @@ 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) {
 	if sel != "" && !strings.Contains(pkgDir, sel) {
 		return
 	}
 	log.Println("Parsing", pkgDir)
 	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)
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/internal/build/build.go b/internal/build/build.go
index 1f015109..e12e57eb 100644
--- a/internal/build/build.go
+++ b/internal/build/build.go
@@ -122,7 +122,6 @@ const (
 
 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,
@@ -138,6 +137,7 @@ func Do(args []string, conf *Config) ([]Package, error) {
 		}
 	}
 
+	cl.EnableDebugSymbols(IsDebugEnabled())
 	llssa.Initialize(llssa.InitAll)
 
 	target := &llssa.Target{
@@ -187,7 +187,7 @@ func Do(args []string, conf *Config) ([]Package, error) {
 	})
 
 	buildMode := ssaBuildMode
-	if cl.DebugSymbols() {
+	if IsDebugEnabled() {
 		buildMode |= ssa.GlobalDebug
 	}
 	if !IsOptimizeEnabled() {
@@ -460,7 +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")
 	}
 
diff --git a/internal/llgen/llgenf.go b/internal/llgen/llgenf.go
index 283f4d51..e7f8cc83 100644
--- a/internal/llgen/llgenf.go
+++ b/internal/llgen/llgenf.go
@@ -32,6 +32,13 @@ func GenFrom(fileOrPkg string) string {
 }
 
 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)
+
 	conf := &build.Config{
 		Mode:   build.ModeGen,
 		AppExt: build.DefaultAppExt(),
@@ -49,8 +56,22 @@ func DoFile(fileOrPkg, outFile string) {
 	check(err)
 }
 
-func SmartDoFile(pkgPath ...string) {
-	pkg, err := genFrom(pkgPath[0])
+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"