关于Android源码中编译C模块的错误

一、系统环境

开发环境：ubuntu11.10

源码包：Android2.2

二、原工程（helloworld）

在Android2.2/development/hello/下创建文件hello.c和Android.mk

//hello.c

#include<stdio.h>

int main()
{
printf("Hi,this is scan module interface...\n");
exit(0);
}

##Android.mk

LOCAL_PATH:=$(call my-dir)
include $(CLEAR_VARS)
LOCAL_MODULE := helloworld
LOCAL_SRC_FILES := hello.c
include $(BUILD_EXECUTABLE)

如上创建了文件，返回到android的根目录下，运行命令

make  helloworld

却出现如下错误：

lai@lai-ThinkPad-X61:~/af-t34$ . build/envsetup.sh
including device/htc/dream/vendorsetup.sh
including device/htc/passion/vendorsetup.sh
including device/htc/sapphire/vendorsetup.sh
lai@lai-ThinkPad-X61:~/af-t34$ make helloworld
============================================
PLATFORM_VERSION_CODENAME=REL
PLATFORM_VERSION=2.2
TARGET_PRODUCT=generic
TARGET_BUILD_VARIANT=eng
TARGET_SIMULATOR=
TARGET_BUILD_TYPE=release
TARGET_BUILD_APPS=
TARGET_ARCH=arm
HOST_ARCH=x86
HOST_OS=linux
HOST_BUILD_TYPE=release
BUILD_ID=FRF91
============================================
build/core/copy_headers.mk:15: 警告：覆盖关于目标“out/target/product/generic/obj/include/libpv/SsbSipMfcApi.h”的命令
build/core/copy_headers.mk:15: 警告：忽略关于目标“out/target/product/generic/obj/include/libpv/SsbSipMfcApi.h”的旧命令
external/opencore/build_config/opencore_dynamic/Android_opencore_common.mk:104: external/opencore/codecs_v2/video/mfc_c100/dec/Android.mk: 没有那个文件或目录
external/opencore/build_config/opencore_dynamic/Android_opencore_common.mk:105: external/opencore/codecs_v2/video/mfc_c100/enc/Android.mk: 没有那个文件或目录
vendor/sec/sec_proprietary/smdkc110/keychars/Android.mk:28: 警告：覆盖关于目标“out/target/product/generic/system/usr/keylayout/qwerty.kl”的命令
sdk/emulator/keymaps/Android.mk:13: 警告：忽略关于目标“out/target/product/generic/system/usr/keylayout/qwerty.kl”的旧命令
vendor/sec/sec_proprietary/smdkc100/keychars/Android.mk:22: 警告：覆盖关于目标“out/target/product/generic/system/usr/keylayout/s3c-keypad.kl”的命令
vendor/sec/sec_proprietary/smdkc110/keychars/Android.mk:22: 警告：忽略关于目标“out/target/product/generic/system/usr/keylayout/s3c-keypad.kl”的旧命令
build/core/base_rules.mk:128: *** vendor/sec/sec_proprietary/smdkc100/keychars: MODULE.TARGET.KEYCHARS.s3c-keypad.kcm already defined by vendor/sec/sec_proprietary/smdkc110/keychars。 停止。
lai@lai-ThinkPad-X61:~/af-t34$

三、排错

首先定位错误在【build/core/base_rules.mk:128: *** vendor/sec/sec_proprietary/smdkc100/keychars: MODULE.TARGET.KEYCHARS.s3c-keypad.kcm already defined by vendor/sec/sec_proprietary/smdkc110/keychars。 停止。】

在android源码包中的“vendor/sec/sec_proprietary/”路径下有文件夹“smdkc100/keychars/”和“smdkc110/keychars/”。并且在这个两个文件夹下都有“s3c-keypad.kcm”文件。

原因可能是没有选择编译目标。

如何选择编译目标呢？看到编译源码中有一个提示，抱着试试的心里做了：

$ make helloworld PRODUCT-sec_smdkv210-eng

============================================
PLATFORM_VERSION_CODENAME=REL
PLATFORM_VERSION=2.2
TARGET_PRODUCT=sec_smdkv210
TARGET_BUILD_VARIANT=eng
TARGET_SIMULATOR=
TARGET_BUILD_TYPE=release
TARGET_BUILD_APPS=
TARGET_ARCH=arm
HOST_ARCH=x86
HOST_OS=linux
HOST_BUILD_TYPE=release
BUILD_ID=FRF91
============================================

结果还真成了，out/target/product/smdkv210/system/bin/文件夹中找到了helloworld的二进制文件。

四、运行测试

开机，连接usb数据线。拷贝helloworld到android的文件系统中：

adb push helloworld /data/

然后到terminal中运行里

# ./helloworld
Hi,this is scan module interface...

在此感谢网友Jeffery ~~