diff --git a/core.mak b/core.mak
index 48f81519..dfb0c6c6 100644
--- a/core.mak
+++ b/core.mak
@@ -110,10 +110,11 @@ $(TB_OBJS): $(@:$(OBJ_DIR)/%.o=%.c)
 $(TCC_DIR)/config.h: $(TCC_DIR)/configure
 	cd $(TCC_DIR)/ && ./configure
 
-$(TCC_DIR)/tccdefs_.h: $(TCC_DIR)/include/tccdefs.h
-	$(MAKE) -C $(TCC_DIR) tccdefs_.h
+$(TCC_DIR)/tccdefs_.h: $(TCC_DIR)/include/tccdefs.h $(TCC_DIR)/config.h
+	# $(MAKE) -C $(TCC_DIR) tccdefs_.h
+	echo '""' > $(TCC_DIR)/tccdefs_.h
 
-$(TCC_OBJS): $(@:$(OBJ_DIR)/%.o=%.c) $(TCC_DIR) $(TCC_DIR)/config.h
+$(TCC_OBJS): $(@:$(OBJ_DIR)/%.o=%.c) $(TCC_DIR) $(TCC_DIR)/tccdefs_.h $(TCC_DIR)/config.h
 	@mkdir -p $$(dirname $(@))
 	$(CC) -c $(OPT) $(@:$(OBJ_DIR)/%.o=%.c) -o $(@) $(CFLAGS)
 
diff --git a/main/minivm.c b/main/minivm.c
index 8617b030..e541ea2a 100644
--- a/main/minivm.c
+++ b/main/minivm.c
@@ -56,6 +56,7 @@ int main(int argc, char **argv) {
         .use_tb_opt = false,
         .use_num = VM_USE_NUM_F64,
         .target = VM_TARGET_TB,
+        .tb_use_tailcall = true,
 #endif
     };
     vm_blocks_t val_blocks = {0};
@@ -105,6 +106,8 @@ int main(int argc, char **argv) {
                 config->tb_regs_node = enable;
             } else if (!strcmp(arg, "force-bitcast")) {
                 config->tb_force_bitcast = enable;
+            } else if (!strcmp(arg, "tailcall")) {
+                config->tb_use_tailcall = enable;
             } else {
                 fprintf(stderr, "error: unknown flag --tb-%s want --tb-recompile, --tb-cast-regs, or --tb-raw-regs", arg);
                 return 1;
diff --git a/vm/backend/exec.c b/vm/backend/exec.c
index 788b73f3..a1aaaaa2 100644
--- a/vm/backend/exec.c
+++ b/vm/backend/exec.c
@@ -73,13 +73,13 @@ void *vm_cache_comp(const char *comp, const char **srcs, const char *entry) {
         fwrite(src_buf->buf, src_buf->len, 1, out);
         fclose(out);
         vm_io_buffer_t *cmd_buf = vm_io_buffer_new();
-        // vm_io_buffer_format(cmd_buf, "%s -shared -O2 -foptimize-sibling-calls -fPIC %s -o %s -w -pipe", comp, c_file, so_file);
-        vm_io_buffer_format(cmd_buf, "%s -shared -g2 -foptimize-sibling-calls -fPIC %s -o %s -w -pipe", comp, c_file, so_file);
+        vm_io_buffer_format(cmd_buf, "%s -shared -O2 -foptimize-sibling-calls -fPIC %s -o %s -w -pipe", comp, c_file, so_file);
+        // vm_io_buffer_format(cmd_buf, "%s -shared -g2 -foptimize-sibling-calls -fPIC %s -o %s -w -pipe", comp, c_file, so_file);
         int res = system(cmd_buf->buf);
         if (res) {
             return NULL;
         }
-        // remove(c_file);
+        remove(c_file);
     }
     void *handle = dlopen(so_file, RTLD_LAZY);
     void *sym = dlsym(handle, entry);
diff --git a/vm/backend/tb.c b/vm/backend/tb.c
index 331ebab0..9e205d9f 100644
--- a/vm/backend/tb.c
+++ b/vm/backend/tb.c
@@ -534,7 +534,7 @@ branch_uses_reg:;
                 false
             );
 
-            if (VM_NO_TAILCALL) {
+            if (state->config->tb_use_tailcall) {
                 TB_MultiOutput out = vm_tb_inst_call(
                     state,
                     next_proto,
@@ -565,7 +565,7 @@ branch_uses_reg:;
             false
         );
 
-        if (VM_NO_TAILCALL) {
+        if (state->config->tb_use_tailcall) {
             TB_MultiOutput out = vm_tb_inst_call(
                 state,
                 next_proto,
@@ -599,7 +599,7 @@ branch_uses_reg:;
             }
         }
 
-        if (VM_NO_TAILCALL) {
+        if (state->config->tb_use_tailcall) {
             TB_MultiOutput out = vm_tb_inst_call(
                 state,
                 next_proto,
diff --git a/vm/config.h b/vm/config.h
index 2e69a37b..01683b12 100644
--- a/vm/config.h
+++ b/vm/config.h
@@ -5,7 +5,6 @@
 #include <stdbool.h>
 
 #define VM_USE_DUMP 1
-#define VM_NO_TAILCALL 1
 #define VM_FORMAT_FLOAT "%.14g"
 
 struct vm_config_t;
@@ -64,6 +63,7 @@ struct vm_config_t {
     bool tb_regs_cast: 1;
     bool tb_regs_node: 1;
     bool tb_force_bitcast: 1;
+    bool tb_use_tailcall;
 };
 
 #endif