Android中使用Makefile编译程序和库的方法

test为可执行程序，libtest为库。在Android中编译并运行它们方法如下，首先要下载NDK。

参考了http://blog.csdn.net/L____J/archive/2010/08/04/5787759.aspx的方法，在此感谢。

1. 将库编译为动态库时：

test中仅有一个文件main.c

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#include <stdio.h>

#include "libtest.h"

static char s_string[] = "Study hard!";

int main()

{

printf("%s/n%d/n", s_string, ret8());

return 0;

}

Makefile内容如下

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BASE_PATH = /home/apuser/Downloads/android-ndk/android-ndk-r4

PATH_PREFIX = $(BASE_PATH)/build/platforms/android-8/arch-arm/usr/

CC = $(BASE_PATH)/build/prebuilt/linux-x86/arm-eabi-4.4.0/bin/arm-eabi-gcc

LD = $(BASE_PATH)/build/prebuilt/linux-x86/arm-eabi-4.4.0/bin/arm-eabi-ld

INCLUDES= -I $(PATH_PREFIX)/include /

-I/home/apuser/Downloads/android-ndk/android-ndk-r4/libtest/

CFLAGS = -L $(PATH_PREFIX)/lib

LDFLAGS += -nostdlib -lm -lstdc++ -lc -ldl -Bdynamic -Wl,-dynamic-linker,/system/bin/linker

LDFLAGS += /home/apuser/Downloads/android-ndk/android-ndk-r4/libtest/libtest.so

EXTRA_OBJS = $(PATH_PREFIX)/lib/crtbegin_dynamic.o $(PATH_PREFIX)/lib/crtend_android.o

test: main.c

$(CC) $(CFLAGS) $(INCLUDES) -o $@ $^ $(EXTRA_OBJS) $(LDFLAGS)

clean:

rm -rf test *.o

libtest中有头文件libtest.h和libtest.c

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#ifndef _RET_8_H_

#define _RET_8_H_

int ret8();

#endif

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#include "libtest.h"

int ret8()

{

return 8;

}

Makefile内容如下

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ASE_PATH = /home/apuser/Downloads/android-ndk/android-ndk-r4

PATH_PREFIX = $(BASE_PATH)/build/platforms/android-3/arch-arm/usr/

CC = $(BASE_PATH)/build/prebuilt/linux-x86/arm-eabi-4.4.0/bin/arm-eabi-gcc

CCFLAGS = -I$(PATH_PREFIX)/include /

-fpic /

-mthumb-interwork /

-ffunction-sections /

-funwind-tables /

-fstack-protector /

-fno-short-enums /

-D__ARM_ARCH_5__ /

-D__ARM_ARCH_5T__ /

-D__ARM_ARCH_5E__ /

-D__ARM_ARCH_5TE__ /

-Wno-psabi /

-march=armv5te /

-mtune=xscale /

-msoft-float /

-mthumb /

-Os /

-fomit-frame-pointer /

-fno-strict-aliasing /

-finline-limit=64 /

-DANDROID /

-Wa,--noexecstack /

-O2 /

-DNDEBUG /

-g /

LDFLAGS = -nostdlib -Wl,-soname,libtest.so -Wl,-shared,-Bsymbolic -Wl,--whole-archive -Wl,--no-whole-archive -Wl,--no-undefined -Wl,-z,noexecstack -Wl,-rpath-link=$(PATH_PREFIX)lib

EXTRA_OBJS = $(BASE_PATH)/build/prebuilt/linux-x86/arm-eabi-4.4.0/bin/../lib/gcc/arm-eabi/4.4.0/libgcc.a $(PATH_PREFIX)/lib/libc.so $(PATH_PREFIX)/lib/libstdc++.so $(PATH_PREFIX)/lib/libm.so

libtest.so: libtest.o

$(CC) $(LDFLAGS) $^ $(EXTRA_OBJS) -o $@

libtest.o: libtest.c

$(CC) $(CCFLAGS) -c $^ -o $@

clean:

rm *.so *.o

启动模拟器后，在ubuntu的shell中输入

adb push test /data/

adb push libtest /data/

adb shell chmod 777 /data/test

在模拟器的shell中

cd /data/

export LD_LIBRARY_PATH=./:$LD_LIBRARY_PATH

./test

注意

EXTRA_OBJS = $(BASE_PATH)/build/prebuilt/linux-x86/arm-eabi-4.4.0/bin/../lib/gcc/arm-eabi/4.4.0/libgcc.a

libgcc.a需放在其它库的前面，否则程序在运行时会有无法链接的提示，但在链接时没有报错。

2. 将库编译为静态库时

test的Makefile此时为将

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LDFLAGS += /home/apuser/Downloads/android-ndk/android-ndk-r4/libtest/libtest.so

改为

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LDFLAGS += /home/apuser/Downloads/android-ndk/android-ndk-r4/libtest/libtest.a

即可

libtest的Makefile此时为

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BASE_PATH = /home/apuser/Downloads/android-ndk/android-ndk-r4

PATH_PREFIX = $(BASE_PATH)/build/platforms/android-8/arch-arm/usr/

CC = $(BASE_PATH)/build/prebuilt/linux-x86/arm-eabi-4.4.0/bin/arm-eabi-gcc

INCLUDES= -I $(PATH_PREFIX)/include

CCFLAGS = -L $(PATH_PREFIX)/lib /

-fPIC /

-Wall

libtest.a: libtest.o

$(AR) -rcs $@ $^

libtest.o : libtest.c

clean:

rm *.a

3. test的Makefile也可通过automake工具生成

首先执行autoscan

将生成的configure.scan重命名为configure.ac

configure.ac内容修改如下

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AC_PREREQ([2.65])

AC_INIT([test], [1.0.0], [-])

AM_INIT_AUTOMAKE

AC_CONFIG_SRCDIR([test.c])

AC_CONFIG_HEADERS([config.h])

# Checks for programs.

AC_PROG_CC

# Checks for libraries.

# Checks for header files.

#AC_CHECK_HEADERS([string.h])

# Checks for typedefs, structures, and compiler characteristics.

# Checks for library functions.

AC_OUTPUT([Makefile])

Makefile.am内容如下

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AUTOMAKE_OPTIONS = foreign

bin_PROGRAMS = test

test_SOURCES = test.c

依次执行

aclocal

autoheader

autoconf

automake --add-missing

编写脚本build.sh，内容如下

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CC=arm-eabi-gcc /

LD=arm-eabi-gcc /

CFLAGS="-I/home/apuser/Downloads/android-ndk/android-ndk-r4/build/platforms/android-8/arch-arm/usr/include" /

LDFLAGS="-L/home/apuser/Downloads/android-ndk/android-ndk-r4/build/platforms/android-8/arch-arm/usr/lib -nostdlib -lm -lstdc++ -lc -ldl -Bdynamic -Wl,-dynamic-linker,/system/bin/linker /home/apuser/Downloads/android-ndk/android-ndk-r4/build/platforms/android-8/arch-arm/usr/lib/crtbegin_dynamic.o /home/apuser/Downloads/android-ndk/android-ndk-r4/build/platforms/android-8/arch-arm/usr/lib/crtend_android.o" /

./configure /

--build=i386-linux /

--host=arm-elf-linux /

执行脚本build.sh后编译即可。

另有Funambol的脚本，也可使用，内容如下

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command for C compiller:

./configure --host=arm-eabi CC=arm-eabi-gcc CPPFLAGS="-I$ANDROID_ROOT/build/platforms/android-5/arch-arm/usr/include/" CFLAGS="-nostdlib -fno-exceptions -fno-rtti -Wno-multichar" LDFLAGS="-Wl,-rpath-link=$ANDROID_ROOT/build/platforms/android-5/arch-arm/usr/lib/ -L$ANDROID_ROOT/build/platforms/android-5/arch-arm/usr/lib/" LIBS="-lc"

command for C++ compiller:

./configure --host=arm-eabi CXX=arm-eabi-g++ CPPFLAGS="-I$ANDROID_ROOT/build/platforms/android-5/arch-arm/usr/include/ -nostdlib -fno-exceptions -fno-rtti -Wno-multichar" LDFLAGS="-Wl,-rpath-link=$ANDROID_ROOT/build/platforms/android-5/arch-arm/usr/lib/ -L$ANDROID_ROOT/build/platforms/android-5/arch-arm/usr/lib/" LIBS="-lc"