[android-kernel] How can I reference functions in .S files

[guoguo]

Hello every one

I have a tool.S like this

.text
.align2
.global asm_call
asm_call:
  mov r0 , #0
  mov r1 , #1


and I wrote a test.c like this

#include <stdio.h>
void asm_call();

int main(int argc , char **argv)
{
    asm_call();
}

My make file like this
LOCAL_PATH :=$(call my-dir)
include $(CLEAR_VARS)
LOCAL_MODULE_TAGS := optional
LOCAL_MODULE := test
arm_src_files := tool.S
LOCAL_SRC_FILES := test.c
LOCAL_SHARED_LIBRARIES :=libdl

include $(BUILD_EXECUTABLE)

when I run  mmm ./external/test

there is an error said  : error undefined reference to 'asm_call'

I'v tryed to add 'extern' before 'asm_call' in c code like this  : extern
void asm_call() , and the result remain the same .

Can any one give me some advise ?
Thanks.

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