diff --git a/chore/nmdump/nmdump.go b/chore/nmdump/nmdump.go
index 5998905a..d14a6b5e 100644
--- a/chore/nmdump/nmdump.go
+++ b/chore/nmdump/nmdump.go
@@ -18,9 +18,10 @@ package main
 
 import (
 	"fmt"
+	"log"
 	"os"
 
-	"github.com/goplus/llgo/x/nm"
+	"github.com/goplus/llgo/x/env/llvm"
 )
 
 func main() {
@@ -29,9 +30,8 @@ func main() {
 		return
 	}
 
-	nm := nm.New("nm")
+	nm := llvm.New().Nm()
 	items, err := nm.List(os.Args[1])
-	check(err)
 	for _, item := range items {
 		if item.File != "" {
 			fmt.Printf("\n%s:\n", item.File)
@@ -44,10 +44,7 @@ func main() {
 			}
 		}
 	}
-}
-
-func check(err error) {
 	if err != nil {
-		panic(err)
+		log.Println(err)
 	}
 }
diff --git a/chore/nmindex/nmindex.go b/chore/nmindex/nmindex.go
index b20bc53e..29e7304d 100644
--- a/chore/nmindex/nmindex.go
+++ b/chore/nmindex/nmindex.go
@@ -64,6 +64,7 @@ func makeIndex() {
 		usrLib(true),
 		stdLib("LLGO_STDROOT"),
 		stdLib("LLGO_USRROOT"),
+		pythonLib(),
 	}
 	err := b.Index(libDirs, idxDir, func(path string) {
 		fmt.Println("==>", path)
@@ -103,6 +104,10 @@ func usrLib(local bool) string {
 	return "/usr/lib"
 }
 
+func pythonLib() string {
+	return os.Getenv("LLGO_PYTHON_ROOT")
+}
+
 func check(err error) {
 	if err != nil {
 		panic(err)
diff --git a/x/nm/nm.go b/x/nm/nm.go
index 6a909c2b..23ff57db 100644
--- a/x/nm/nm.go
+++ b/x/nm/nm.go
@@ -83,14 +83,15 @@ func (p *Cmd) List(arfile string) (items []*ObjectFile, err error) {
 	cmd := exec.Command(p.app, arfile)
 	cmd.Stdout = &stdout
 	cmd.Stderr = &stderr
-	err = cmd.Run()
+	e := cmd.Run()
 	if stderr.Len() > 0 {
 		listError(stderr.Bytes())
 	}
-	if err != nil {
-		return
+	items, err = listOutput(stdout.Bytes())
+	if err == nil {
+		err = e
 	}
-	return listOutput(stdout.Bytes())
+	return
 }
 
 func listError(data []byte) {
@@ -138,7 +139,7 @@ func listOutput(data []byte) (items []*ObjectFile, err error) {
 				Name: string(line[19:]),
 				Type: SymbolType(line[17]),
 			}
-			if sym.FAddr = line[0] != ' '; sym.FAddr {
+			if sym.FAddr = hasAddr(line); sym.FAddr {
 				sym.Addr = hexUint64(line)
 			}
 		} else {
@@ -146,7 +147,7 @@ func listOutput(data []byte) (items []*ObjectFile, err error) {
 				Name: string(line[11:]),
 				Type: SymbolType(line[9]),
 			}
-			if sym.FAddr = line[0] != ' '; sym.FAddr {
+			if sym.FAddr = hasAddr(line); sym.FAddr {
 				sym.Addr = uint64(hexUint32(line))
 			}
 		}
@@ -155,6 +156,11 @@ func listOutput(data []byte) (items []*ObjectFile, err error) {
 	return
 }
 
+func hasAddr(line []byte) bool {
+	c := line[0]
+	return c != ' ' && c != '-'
+}
+
 func is64bits(line []byte) bool {
 	if line[0] != ' ' {
 		return line[8] != ' '