fix(c/setjmp): generate native pointer parameters

c/setjmp/generated_native_darwin_arm64_llgo_test.go

@@ -0,0 +1,23 @@
+//go:build llgo && darwin && arm64 && !ios
+
+package setjmp_test
+
+import (
+	"github.com/goplus/lib/c"
+	"github.com/goplus/lib/c/setjmp"
+	"testing"
+)
+
+func TestGeneratedSetjmpWritesCallerBuffer(t *testing.T) {
+	var buffer [48]c.Int
+	if result := setjmp.NativeSetjmp(&buffer[0]); result != 0 {
+		t.Fatalf("initial setjmp = %d", result)
+	}
+	changed := false
+	for _, word := range buffer {
+		changed = changed || word != 0
+	}
+	if !changed {
+		t.Fatal("setjmp did not write the caller-owned buffer")
+	}
+}

c/setjmp/generated_native_linux_llgo_test.go

@@ -0,0 +1,24 @@
+//go:build llgo && linux && (amd64 || arm64) && !android
+
+package setjmp_test
+
+import (
+	"github.com/goplus/lib/c/setjmp"
+	"testing"
+	"unsafe"
+)
+
+func TestGeneratedSetjmpWritesCallerBuffer(t *testing.T) {
+	var buffer setjmp.X__JmpBufTag
+	if result := buffer.NativeSetjmp(); result != 0 {
+		t.Fatalf("initial setjmp = %d", result)
+	}
+	bytes := unsafe.Slice((*byte)(unsafe.Pointer(&buffer)), unsafe.Sizeof(buffer))
+	changed := false
+	for _, b := range bytes {
+		changed = changed || b != 0
+	}
+	if !changed {
+		t.Fatal("setjmp did not write the caller-owned buffer")
+	}
+}

c/setjmp/llcppg.pub

@@ -0,0 +1,4 @@
+T __jmp_buf X__JmpBuf
+T __jmp_buf_tag X__JmpBufTag
+T jmp_buf JmpBuf
+T sigjmp_buf SigjmpBuf