diff --git a/cl/_testgo/equal/out.ll b/cl/_testgo/equal/out.ll
index fec88027..fdd5222f 100644
--- a/cl/_testgo/equal/out.ll
+++ b/cl/_testgo/equal/out.ll
@@ -98,6 +98,22 @@ _llgo_0:
   ret void
 }
 
+define i64 @"main.init#1$1"(i64 %0, i64 %1) {
+_llgo_0:
+  %2 = add i64 %0, %1
+  ret i64 %2
+}
+
+define void @"main.init#1$2"(ptr %0) {
+_llgo_0:
+  %1 = load { ptr }, ptr %0, align 8
+  %2 = extractvalue { ptr } %1, 0
+  %3 = load i64, ptr %2, align 4
+  call void @"github.com/goplus/llgo/internal/runtime.PrintInt"(i64 %3)
+  call void @"github.com/goplus/llgo/internal/runtime.PrintByte"(i8 10)
+  ret void
+}
+
 define void @"main.init#2"() {
 _llgo_0:
   call void @main.assert(i1 true)
@@ -780,21 +796,9 @@ declare void @"github.com/goplus/llgo/internal/runtime.Panic"(%"github.com/goplu
 
 declare ptr @"github.com/goplus/llgo/internal/runtime.AllocZ"(i64)
 
-define void @"main.init#1$2"(ptr %0) {
-_llgo_0:
-  %1 = load { ptr }, ptr %0, align 8
-  %2 = extractvalue { ptr } %1, 0
-  %3 = load i64, ptr %2, align 4
-  call void @"github.com/goplus/llgo/internal/runtime.PrintInt"(i64 %3)
-  call void @"github.com/goplus/llgo/internal/runtime.PrintByte"(i8 10)
-  ret void
-}
+declare void @"github.com/goplus/llgo/internal/runtime.PrintInt"(i64)
 
-define i64 @"main.init#1$1"(i64 %0, i64 %1) {
-_llgo_0:
-  %2 = add i64 %0, %1
-  ret i64 %2
-}
+declare void @"github.com/goplus/llgo/internal/runtime.PrintByte"(i8)
 
 declare ptr @"github.com/goplus/llgo/internal/runtime.Zeroinit"(ptr, i64)
 
@@ -815,7 +819,3 @@ declare ptr @"github.com/goplus/llgo/internal/runtime.Interface"(%"github.com/go
 declare void @"github.com/goplus/llgo/internal/runtime.InitNamed"(ptr, %"github.com/goplus/llgo/internal/runtime.String", %"github.com/goplus/llgo/internal/runtime.String", ptr, %"github.com/goplus/llgo/internal/runtime.Slice", %"github.com/goplus/llgo/internal/runtime.Slice")
 
 declare void @"github.com/goplus/llgo/internal/runtime.init"()
-
-declare void @"github.com/goplus/llgo/internal/runtime.PrintInt"(i64)
-
-declare void @"github.com/goplus/llgo/internal/runtime.PrintByte"(i8)
diff --git a/cl/_testgo/goroutine/out.ll b/cl/_testgo/goroutine/out.ll
index 87077df0..ef8f5b75 100644
--- a/cl/_testgo/goroutine/out.ll
+++ b/cl/_testgo/goroutine/out.ll
@@ -72,10 +72,6 @@ _llgo_3:                                          ; preds = %_llgo_1, %_llgo_0
   br i1 %22, label %_llgo_2, label %_llgo_1
 }
 
-declare void @"github.com/goplus/llgo/internal/runtime.init"()
-
-declare ptr @"github.com/goplus/llgo/internal/runtime.AllocZ"(i64)
-
 define void @"main.main$1"(ptr %0, %"github.com/goplus/llgo/internal/runtime.String" %1) {
 _llgo_0:
   call void @"github.com/goplus/llgo/internal/runtime.PrintString"(%"github.com/goplus/llgo/internal/runtime.String" %1)
@@ -86,6 +82,10 @@ _llgo_0:
   ret void
 }
 
+declare void @"github.com/goplus/llgo/internal/runtime.init"()
+
+declare ptr @"github.com/goplus/llgo/internal/runtime.AllocZ"(i64)
+
 declare ptr @"github.com/goplus/llgo/internal/runtime.AllocU"(i64)
 
 declare ptr @malloc(i64)
diff --git a/cl/_testlibgo/sync/out.ll b/cl/_testlibgo/sync/out.ll
new file mode 100644
index 00000000..1c8a0e79
--- /dev/null
+++ b/cl/_testlibgo/sync/out.ll
@@ -0,0 +1 @@
+;
\ No newline at end of file
diff --git a/cl/_testrt/builtin/out.ll b/cl/_testrt/builtin/out.ll
index 858d32ef..74b754b6 100644
--- a/cl/_testrt/builtin/out.ll
+++ b/cl/_testrt/builtin/out.ll
@@ -613,6 +613,29 @@ _llgo_3:                                          ; preds = %_llgo_1
   ret i32 0
 }
 
+define void @"main.main$1"() {
+_llgo_0:
+  %0 = alloca %"github.com/goplus/llgo/internal/runtime.String", align 8
+  %1 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.String", ptr %0, i32 0, i32 0
+  store ptr @6, ptr %1, align 8
+  %2 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.String", ptr %0, i32 0, i32 1
+  store i64 2, ptr %2, align 4
+  %3 = load %"github.com/goplus/llgo/internal/runtime.String", ptr %0, align 8
+  call void @"github.com/goplus/llgo/internal/runtime.PrintString"(%"github.com/goplus/llgo/internal/runtime.String" %3)
+  call void @"github.com/goplus/llgo/internal/runtime.PrintByte"(i8 10)
+  ret void
+}
+
+define void @"main.main$2"(ptr %0) {
+_llgo_0:
+  %1 = load { ptr }, ptr %0, align 8
+  %2 = extractvalue { ptr } %1, 0
+  %3 = load i64, ptr %2, align 4
+  call void @"github.com/goplus/llgo/internal/runtime.PrintInt"(i64 %3)
+  call void @"github.com/goplus/llgo/internal/runtime.PrintByte"(i8 10)
+  ret void
+}
+
 declare ptr @"github.com/goplus/llgo/internal/runtime.AllocZ"(i64)
 
 declare void @"github.com/goplus/llgo/internal/runtime.init"()
@@ -664,31 +687,8 @@ declare void @"github.com/goplus/llgo/internal/runtime.PrintPointer"(ptr)
 
 declare i64 @"github.com/goplus/llgo/internal/runtime.SliceCopy"(%"github.com/goplus/llgo/internal/runtime.Slice", ptr, i64, i64)
 
-define void @"main.main$2"(ptr %0) {
-_llgo_0:
-  %1 = load { ptr }, ptr %0, align 8
-  %2 = extractvalue { ptr } %1, 0
-  %3 = load i64, ptr %2, align 4
-  call void @"github.com/goplus/llgo/internal/runtime.PrintInt"(i64 %3)
-  call void @"github.com/goplus/llgo/internal/runtime.PrintByte"(i8 10)
-  ret void
-}
-
 declare ptr @"github.com/goplus/llgo/internal/runtime.AllocU"(i64)
 
-define void @"main.main$1"() {
-_llgo_0:
-  %0 = alloca %"github.com/goplus/llgo/internal/runtime.String", align 8
-  %1 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.String", ptr %0, i32 0, i32 0
-  store ptr @6, ptr %1, align 8
-  %2 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.String", ptr %0, i32 0, i32 1
-  store i64 2, ptr %2, align 4
-  %3 = load %"github.com/goplus/llgo/internal/runtime.String", ptr %0, align 8
-  call void @"github.com/goplus/llgo/internal/runtime.PrintString"(%"github.com/goplus/llgo/internal/runtime.String" %3)
-  call void @"github.com/goplus/llgo/internal/runtime.PrintByte"(i8 10)
-  ret void
-}
-
 declare ptr @"github.com/goplus/llgo/internal/runtime.NewStringIter"(%"github.com/goplus/llgo/internal/runtime.String")
 
 declare { i1, i64, i32 } @"github.com/goplus/llgo/internal/runtime.StringIterNext"(ptr)
diff --git a/cl/_testrt/closure/out.ll b/cl/_testrt/closure/out.ll
index 326344f3..88e47a5c 100644
--- a/cl/_testrt/closure/out.ll
+++ b/cl/_testrt/closure/out.ll
@@ -50,28 +50,18 @@ _llgo_0:
   ret i32 0
 }
 
-declare void @"github.com/goplus/llgo/internal/runtime.init"()
-
 define void @"main.main$1"(i64 %0, i64 %1) {
 _llgo_0:
   %2 = call i32 (ptr, ...) @printf(ptr @0, i64 %0, i64 %1)
   ret void
 }
 
-declare ptr @"github.com/goplus/llgo/internal/runtime.AllocZ"(i64)
-
 define void @"main.main$2"(i64 %0, i64 %1) {
 _llgo_0:
   %2 = call i32 (ptr, ...) @printf(ptr @1, i64 %0, i64 %1)
   ret void
 }
 
-define linkonce void @"__llgo_stub.main.main$2"(ptr %0, i64 %1, i64 %2) {
-_llgo_0:
-  tail call void @"main.main$2"(i64 %1, i64 %2)
-  ret void
-}
-
 define void @"main.main$3"(ptr %0) {
 _llgo_0:
   %1 = load { ptr }, ptr %0, align 8
@@ -83,6 +73,16 @@ _llgo_0:
   ret void
 }
 
+declare void @"github.com/goplus/llgo/internal/runtime.init"()
+
+declare ptr @"github.com/goplus/llgo/internal/runtime.AllocZ"(i64)
+
+define linkonce void @"__llgo_stub.main.main$2"(ptr %0, i64 %1, i64 %2) {
+_llgo_0:
+  tail call void @"main.main$2"(i64 %1, i64 %2)
+  ret void
+}
+
 declare ptr @"github.com/goplus/llgo/internal/runtime.AllocU"(i64)
 
 declare i32 @printf(ptr, ...)
diff --git a/cl/_testrt/eface/out.ll b/cl/_testrt/eface/out.ll
index d24c6978..2b0e6229 100644
--- a/cl/_testrt/eface/out.ll
+++ b/cl/_testrt/eface/out.ll
@@ -463,6 +463,11 @@ _llgo_0:
   ret i32 0
 }
 
+define void @"main.main$1"() {
+_llgo_0:
+  ret void
+}
+
 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)
@@ -886,11 +891,6 @@ declare ptr @"github.com/goplus/llgo/internal/runtime.ArrayOf"(i64, ptr)
 
 declare ptr @"github.com/goplus/llgo/internal/runtime.AllocU"(i64)
 
-define void @"main.main$1"() {
-_llgo_0:
-  ret void
-}
-
 declare ptr @"github.com/goplus/llgo/internal/runtime.Func"(%"github.com/goplus/llgo/internal/runtime.Slice", %"github.com/goplus/llgo/internal/runtime.Slice", i1)
 
 declare ptr @"github.com/goplus/llgo/internal/runtime.PointerTo"(ptr)
diff --git a/cl/_testrt/intgen/out.ll b/cl/_testrt/intgen/out.ll
index 6f36fcc2..4eaa98d6 100644
--- a/cl/_testrt/intgen/out.ll
+++ b/cl/_testrt/intgen/out.ll
@@ -170,6 +170,19 @@ _llgo_9:                                          ; preds = %_llgo_7
   ret i32 0
 }
 
+define i32 @"main.main$1"(ptr %0) {
+_llgo_0:
+  %1 = load { ptr }, ptr %0, align 8
+  %2 = extractvalue { ptr } %1, 0
+  %3 = load i32, ptr %2, align 4
+  %4 = mul i32 %3, 2
+  %5 = extractvalue { ptr } %1, 0
+  store i32 %4, ptr %5, align 4
+  %6 = extractvalue { ptr } %1, 0
+  %7 = load i32, ptr %6, align 4
+  ret i32 %7
+}
+
 declare ptr @"github.com/goplus/llgo/internal/runtime.AllocZ"(i64)
 
 declare void @"github.com/goplus/llgo/internal/runtime.AssertIndexRange"(i1)
@@ -186,19 +199,6 @@ _llgo_0:
 
 declare i32 @printf(ptr, ...)
 
-define i32 @"main.main$1"(ptr %0) {
-_llgo_0:
-  %1 = load { ptr }, ptr %0, align 8
-  %2 = extractvalue { ptr } %1, 0
-  %3 = load i32, ptr %2, align 4
-  %4 = mul i32 %3, 2
-  %5 = extractvalue { ptr } %1, 0
-  store i32 %4, ptr %5, align 4
-  %6 = extractvalue { ptr } %1, 0
-  %7 = load i32, ptr %6, align 4
-  ret i32 %7
-}
-
 declare ptr @"github.com/goplus/llgo/internal/runtime.AllocU"(i64)
 
 define i32 @"main.next$bound"(ptr %0) {
diff --git a/cl/_testrt/named/out.ll b/cl/_testrt/named/out.ll
index 337619ac..a9c450d2 100644
--- a/cl/_testrt/named/out.ll
+++ b/cl/_testrt/named/out.ll
@@ -123,10 +123,6 @@ _llgo_0:
   ret i32 0
 }
 
-declare void @"github.com/goplus/llgo/internal/runtime.init"()
-
-declare ptr @"github.com/goplus/llgo/internal/runtime.AllocZ"(i64)
-
 define i64 @"main.main$1"(ptr %0, i64 %1) {
 _llgo_0:
   %2 = load { ptr }, ptr %0, align 8
@@ -138,6 +134,10 @@ _llgo_0:
   ret i64 %7
 }
 
+declare void @"github.com/goplus/llgo/internal/runtime.init"()
+
+declare ptr @"github.com/goplus/llgo/internal/runtime.AllocZ"(i64)
+
 declare ptr @"github.com/goplus/llgo/internal/runtime.AllocU"(i64)
 
 declare i32 @printf(ptr, ...)
diff --git a/cl/_testrt/qsort/out.ll b/cl/_testrt/qsort/out.ll
index 2d507d3a..03a2fe69 100644
--- a/cl/_testrt/qsort/out.ll
+++ b/cl/_testrt/qsort/out.ll
@@ -59,12 +59,6 @@ _llgo_3:                                          ; preds = %_llgo_1
   ret i32 0
 }
 
-declare void @"github.com/goplus/llgo/internal/runtime.init"()
-
-declare ptr @"github.com/goplus/llgo/internal/runtime.AllocZ"(i64)
-
-declare void @qsort(ptr, i64, i64, ptr)
-
 define i32 @"main.main$1"(ptr %0, ptr %1) {
 _llgo_0:
   %2 = load i64, ptr %0, align 4
@@ -74,6 +68,12 @@ _llgo_0:
   ret i32 %5
 }
 
+declare void @"github.com/goplus/llgo/internal/runtime.init"()
+
+declare ptr @"github.com/goplus/llgo/internal/runtime.AllocZ"(i64)
+
+declare void @qsort(ptr, i64, i64, ptr)
+
 declare void @"github.com/goplus/llgo/internal/runtime.AssertIndexRange"(i1)
 
 declare i32 @printf(ptr, ...)
diff --git a/cl/_testrt/result/out.ll b/cl/_testrt/result/out.ll
index dde63bee..3866d8ec 100644
--- a/cl/_testrt/result/out.ll
+++ b/cl/_testrt/result/out.ll
@@ -19,6 +19,12 @@ _llgo_0:
   ret { ptr, ptr } %3
 }
 
+define i64 @"main.add$1"(i64 %0, i64 %1) {
+_llgo_0:
+  %2 = add i64 %0, %1
+  ret i64 %2
+}
+
 define { { ptr, ptr }, i64 } @main.add2() {
 _llgo_0:
   %0 = alloca { ptr, ptr }, align 8
@@ -32,6 +38,12 @@ _llgo_0:
   ret { { ptr, ptr }, i64 } %mrv1
 }
 
+define i64 @"main.add2$1"(i64 %0, i64 %1) {
+_llgo_0:
+  %2 = add i64 %0, %1
+  ret i64 %2
+}
+
 define void @main.init() {
 _llgo_0:
   %0 = load i1, ptr @"main.init$guard", align 1
@@ -72,32 +84,6 @@ _llgo_0:
   ret i32 0
 }
 
-define i64 @"main.add$1"(i64 %0, i64 %1) {
-_llgo_0:
-  %2 = add i64 %0, %1
-  ret i64 %2
-}
-
-define linkonce i64 @"__llgo_stub.main.add$1"(ptr %0, i64 %1, i64 %2) {
-_llgo_0:
-  %3 = tail call i64 @"main.add$1"(i64 %1, i64 %2)
-  ret i64 %3
-}
-
-define i64 @"main.add2$1"(i64 %0, i64 %1) {
-_llgo_0:
-  %2 = add i64 %0, %1
-  ret i64 %2
-}
-
-define linkonce i64 @"__llgo_stub.main.add2$1"(ptr %0, i64 %1, i64 %2) {
-_llgo_0:
-  %3 = tail call i64 @"main.add2$1"(i64 %1, i64 %2)
-  ret i64 %3
-}
-
-declare void @"github.com/goplus/llgo/internal/runtime.init"()
-
 define { ptr, ptr } @"main.main$1"() {
 _llgo_0:
   %0 = alloca { ptr, ptr }, align 8
@@ -109,14 +95,28 @@ _llgo_0:
   ret { ptr, ptr } %3
 }
 
-declare i32 @printf(ptr, ...)
-
 define i64 @"main.main$1$1"(i64 %0, i64 %1) {
 _llgo_0:
   %2 = add i64 %0, %1
   ret i64 %2
 }
 
+define linkonce i64 @"__llgo_stub.main.add$1"(ptr %0, i64 %1, i64 %2) {
+_llgo_0:
+  %3 = tail call i64 @"main.add$1"(i64 %1, i64 %2)
+  ret i64 %3
+}
+
+define linkonce i64 @"__llgo_stub.main.add2$1"(ptr %0, i64 %1, i64 %2) {
+_llgo_0:
+  %3 = tail call i64 @"main.add2$1"(i64 %1, i64 %2)
+  ret i64 %3
+}
+
+declare void @"github.com/goplus/llgo/internal/runtime.init"()
+
+declare i32 @printf(ptr, ...)
+
 define linkonce i64 @"__llgo_stub.main.main$1$1"(ptr %0, i64 %1, i64 %2) {
 _llgo_0:
   %3 = tail call i64 @"main.main$1$1"(i64 %1, i64 %2)
diff --git a/internal/lib/sync/sync.go b/internal/lib/sync/sync.go
index 63f22d78..35ad736b 100644
--- a/internal/lib/sync/sync.go
+++ b/internal/lib/sync/sync.go
@@ -46,11 +46,14 @@ func (o *Once) Do(f func()) {
 	if *(*c.Long)(unsafe.Pointer(o)) == 0 { // try init
 		*(*sync.Once)(o) = sync.OnceInit
 	}
-	(*sync.Once)(o).Do(func() {
+	onceDo(o, func() {
 		ptr := onceParam.Get()
 		(*(*func())(ptr))()
 		c.Free(ptr)
 	})
 }
 
+//go:linkname onceDo C.pthread_once
+func onceDo(o *Once, f func()) c.Int
+
 // -----------------------------------------------------------------------------