试图编译OpenSSL库libcrypto.a包装时错误 [英] error when trying to compile wrapper for openssl library libcrypto.a
问题描述
我试图建立围绕Android的libcrypto.a包装一个动态库在
描述<一个href=\"http://wiki.openssl.org/index.php/FIPS_Library_and_Android#Using_FIPS_OpenSSL_in_a_real_Application\" rel=\"nofollow\">http://wiki.openssl.org/index.php/FIPS_Library_and_Android#Using_FIPS_OpenSSL_in_a_real_Application
我公司生产的libcrypto.a在页面上的建议，但是当我尝试编译我的wrapper.c我得到一个链接错误，'atexit对
的多个定义下面是我使用的编译命令行：
ARM-Linux的androideabi-GCC wrapper.c -fPIC -shared -I在/ usr /本地/ SSL / Android的14 /包括-Wl，-Bstatic -lcrypto -L / USR /本地/ SSL / Android的14 / lib目录-o libwrapper.so --sysroot = /用户/ scoleman / Android的NDK-r9d /平台/ Android的14 /弓臂轮候册，-Bdynamic
下面是结果：
<$p$p><$c$c>/Users/scoleman/android-ndk-r9d/toolchains/arm-linux-androideabi-4.6/$p$pbuilt/darwin-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld:错误：/Users/scoleman/android-ndk-r9d/platforms/android-14/arch-arm/usr/lib/libc.a(atexit.o）：atexit对的多重定义/Users/scoleman/android-ndk-r9d/toolchains/arm-linux-androideabi-4.6/$p$pbuilt/darwin-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld: /Users/scoleman/android-ndk-r9d/platforms/android-14/arch-arm/usr/lib/crtbegin_so.o：这里previous定义
/Users/scoleman/android-ndk-r9d/toolchains/arm-linux-androideabi-4.6/$p$pbuilt/darwin-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld:错误：无法找到-ldl
collect2：劳工处返回1退出状态
下面是我的wrapper.c：
的#include＆LT;＆string.h中GT;
＃包括LT＆;＆jni.h GT;INT MY_FIPS_mode（）{
INT模式=模式= FIPS_mode（）;
返回模式;
}
下面是我使用编译命令行：在arm-linux的-androideabi-GCC wrapper.c -fPIC -shared -I在/ usr /本地/ SSL / Android的14 /包括-Wl，-Bstatic -lcrypto -L在/ usr /本地/ SSL / Android的14 / lib目录 - Ølibwrapper.so --sysroot = /用户/ scoleman / Android的NDK-r9d /平台/ Android的14 /弓臂轮候册，-Bdynamic
我能够与您的命令行复制的问题。我将接近这个问题的方法是（增加了可读性换行）：
ARM-Linux的androideabi-GCC wrapper.c -fPIC -shared -o libwrapper.so
--sysroot = ... / Android的NDK-r9d /平台/ Android的14 /弓臂
-I在/ usr /本地/ SSL / Android的14 /包括
/usr/local/ssl/android-14/lib/libssl.a
/usr/local/ssl/android-14/lib/libcrypto.a
-ldl
- SYSROOT 将在平台的头文件和库为Android 4.0（API 14）带来的。这应该是在哪里定义 atexit对。我觉得 -Bstatic 和 -Bdynamic 可能是复杂的事情，因为 atexit对由双方提供的的libc.a 和 crtbegin_so.o 。
我避免 -Bstatic 和 -Bdynamic 。当我想静态链接，我专门召唤出静态库的完整路径，如 /usr/local/ssl/android-14/lib/libcrypto.a 。请记住，归档是目标文件（ * 0 ），所以你可以用它随时随地可以使用的目标文件。
从页面使用 setenv-android.sh 脚本和源，我的不的能够复制：
$。 ./setenv-android.sh
ANDROID_NDK_ROOT中：/ opt / Android的NDK-R9
ANDROID_EABI ARM-Linux的androideabi-4.6
ANDROID_API：Android的14
ANDROID_SYSROOT中：/ opt / Android的NDK-R9 /平台/ Android的14 /弓臂
ANDROID_TOOLCHAIN：/opt/android-ndk-r9/toolchains/arm-linux-androideabi-4.6/$p$pbuilt/darwin-x86_64/bin
CROSS_COMPILE ARM-Linux的androideabi-
ANDROID_DEV中：/ opt / Android的NDK-R9 /平台/ Android的14 /弓臂的/ usr$猫wrapper.c
＃包括LT＆;＆string.h中GT;
＃包括LT＆;＆jni.h GT;
＃包括LT＆;的OpenSSL / evp.h＆GT;INT MY_FIPS_mode（）{
INT模式= FIPS_mode（）;
返回模式;
}$臂Linux的androideabi-GCC wrapper.c -fPIC -shared -o libwrapper.so \\
＆GT; --sysroot = $ ANDROID_SYSROOT \\
＆GT; -I在/ usr /本地/ SSL / Android的14 /包括\\
＆GT; /usr/local/ssl/android-14/lib/libssl.a \\
＆GT; /usr/local/ssl/android-14/lib/libcrypto.a \\
＆GT; -ldl$ LS
libwrapper.so setenv-android.sh wrapper.c$臂Linux的androideabi-readelf -h libwrapper.so
ELF头：
魔：1408米45 4C 46 01 01 01 00 00 00 00 00 00 00 00 00
类别：ELF32
数据：2的补，小尾数
版本：1（电流）
OS / ABI：UNIX - 系统V
ABI版本：0
类型：DYN（共享对象文件）
机：ARM
版本：为0x1
入口地址：为0x0
程序头开始：52（字节到文件）
节头的开始：244660（字节到文件）
标志：0x5000000，版本5 EABI
这个头的大小：52（字节）
程序头的尺寸：32（字节）
程序头数：7
节头的大小：40（字节）
节头数：34
节头字符串表指数：33$臂Linux的androideabi纳米-D libwrapper.so | grep的MY_FIPS_mode
00009fa4ŧMY_FIPS_mode
I'm trying to build a dynamic library for android wrapper around libcrypto.a as described in
http://wiki.openssl.org/index.php/FIPS_Library_and_Android#Using_FIPS_OpenSSL_in_a_real_Application
I've produced the libcrypto.a as suggested on the page, but when I try to compile my wrapper.c I get a linker error, multiple definition of 'atexit'
Here's the command line I'm using to compile:
arm-linux-androideabi-gcc wrapper.c -fPIC -shared -I/usr/local/ssl/android-14/include -Wl,-Bstatic -lcrypto -L/usr/local/ssl/android-14/lib -o libwrapper.so --sysroot=/Users/scoleman/android-ndk-r9d/platforms/android-14/arch-arm -Wl, -Bdynamic
Here are the results:
/Users/scoleman/android-ndk-r9d/toolchains/arm-linux-androideabi-4.6/prebuilt/darwin-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld: error: /Users/scoleman/android-ndk-r9d/platforms/android-14/arch-arm/usr/lib/libc.a(atexit.o): multiple definition of 'atexit'
/Users/scoleman/android-ndk-r9d/toolchains/arm-linux-androideabi-4.6/prebuilt/darwin-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld: /Users/scoleman/android-ndk-r9d/platforms/android-14/arch-arm/usr/lib/crtbegin_so.o: previous definition here
/Users/scoleman/android-ndk-r9d/toolchains/arm-linux-androideabi-4.6/prebuilt/darwin-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld: error: cannot find -ldl
collect2: ld returned 1 exit status
Here's my wrapper.c:
#include <string.h>
#include <jni.h>
int MY_FIPS_mode() {
int mode = mode = FIPS_mode();
return mode;
}
Here's the command line I'm using to compile:
arm-linux-androideabi-gcc wrapper.c -fPIC -shared -I/usr/local/ssl/android-14/include -Wl,-Bstatic -lcrypto -L/usr/local/ssl/android-14/lib -o libwrapper.so --sysroot=/Users/scoleman/android-ndk-r9d/platforms/android-14/arch-arm -Wl, -Bdynamic
I was able to duplicate the issue with your command line. The way I would approach this is (line breaks added for readability):
arm-linux-androideabi-gcc wrapper.c -fPIC -shared -o libwrapper.so
--sysroot=.../android-ndk-r9d/platforms/android-14/arch-arm
-I/usr/local/ssl/android-14/include
/usr/local/ssl/android-14/lib/libssl.a
/usr/local/ssl/android-14/lib/libcrypto.a
-ldl
--sysroot will bring in the platform headers and libraries for Android 4.0 (API 14). That should be where atexit is defined. I think the -Bstatic and -Bdynamic might be complicating things since atexit was provided by both libc.a and crtbegin_so.o.
I avoid -Bstatic and -Bdynamic. When I want static linking, I specifically call out the full pathname of the static library, like /usr/local/ssl/android-14/lib/libcrypto.a. Remember, an archive is a collection of object files (*.o), so you can use it wherever you can use an object file.
Using the setenv-android.sh script from the page and your source, I was not able to duplicate:
$ . ./setenv-android.sh
ANDROID_NDK_ROOT: /opt/android-ndk-r9
ANDROID_EABI: arm-linux-androideabi-4.6
ANDROID_API: android-14
ANDROID_SYSROOT: /opt/android-ndk-r9/platforms/android-14/arch-arm
ANDROID_TOOLCHAIN: /opt/android-ndk-r9/toolchains/arm-linux-androideabi-4.6/prebuilt/darwin-x86_64/bin
CROSS_COMPILE: arm-linux-androideabi-
ANDROID_DEV: /opt/android-ndk-r9/platforms/android-14/arch-arm/usr
$ cat wrapper.c
#include <string.h>
#include <jni.h>
#include <openssl/evp.h>
int MY_FIPS_mode() {
int mode = FIPS_mode();
return mode;
}
$ arm-linux-androideabi-gcc wrapper.c -fPIC -shared -o libwrapper.so \
> --sysroot=$ANDROID_SYSROOT \
> -I/usr/local/ssl/android-14/include \
> /usr/local/ssl/android-14/lib/libssl.a \
> /usr/local/ssl/android-14/lib/libcrypto.a \
> -ldl
$ ls
libwrapper.so setenv-android.sh wrapper.c
$ arm-linux-androideabi-readelf -h libwrapper.so
ELF Header:
Magic: 7f 45 4c 46 01 01 01 00 00 00 00 00 00 00 00 00
Class: ELF32
Data: 2's complement, little endian
Version: 1 (current)
OS/ABI: UNIX - System V
ABI Version: 0
Type: DYN (Shared object file)
Machine: ARM
Version: 0x1
Entry point address: 0x0
Start of program headers: 52 (bytes into file)
Start of section headers: 244660 (bytes into file)
Flags: 0x5000000, Version5 EABI
Size of this header: 52 (bytes)
Size of program headers: 32 (bytes)
Number of program headers: 7
Size of section headers: 40 (bytes)
Number of section headers: 34
Section header string table index: 33
$ arm-linux-androideabi-nm -D libwrapper.so | grep MY_FIPS_mode
00009fa4 T MY_FIPS_mode
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