如何在 C/C++ 中使用 OpenSSL 的静态链接
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How to use static linking with OpenSSL in C/C++
提问by yak
I wrote simple apps with Openssl in C and C++. I compile them like this:
我用 C 和 C++ 用 Openssl 编写了简单的应用程序。我像这样编译它们：
gcc openssltest.c -o openssltest -lcrypto
g++ openssltest.cpp -o openssltest -lcrypto
And its all ok but only, when you have Openssl installed.
这一切都可以，但只有当您安装了 Openssl 时。
I would like to compile it that I can run them on OS where theres no Openssl installend (linux-like OS). I tried this:
我想编译它，以便我可以在没有 Openssl installend（类似 linux 的操作系统）的操作系统上运行它们。我试过这个：
gcc -c openssltest.c -lcrypto -static
gcc openssltest.o -o openssltest -lcrypto -static
and same for C++:
和 C++ 相同：
g++ -c openssltest.cpp -lcrypto -static
g++ openssltest.o -o openssltest -lcrypto -static
But have those errors:
但是有这些错误：
/usr/lib/gcc/x86_64-linux-gnu/4.7/../../../x86_64-linux-gnu/libcrypto.a(dso_dlfcn.o): In function `dlfcn_globallookup':
(.text+0x19): undefined reference to `dlopen'
/usr/lib/gcc/x86_64-linux-gnu/4.7/../../../x86_64-linux-gnu/libcrypto.a(dso_dlfcn.o): In function `dlfcn_globallookup':
(.text+0x2c): undefined reference to `dlsym'
/usr/lib/gcc/x86_64-linux-gnu/4.7/../../../x86_64-linux-gnu/libcrypto.a(dso_dlfcn.o): In function `dlfcn_globallookup':
(.text+0x37): undefined reference to `dlclose'
/usr/lib/gcc/x86_64-linux-gnu/4.7/../../../x86_64-linux-gnu/libcrypto.a(dso_dlfcn.o): In function `dlfcn_bind_func':
(.text+0x354): undefined reference to `dlsym'
/usr/lib/gcc/x86_64-linux-gnu/4.7/../../../x86_64-linux-gnu/libcrypto.a(dso_dlfcn.o): In function `dlfcn_bind_func':
(.text+0x3fb): undefined reference to `dlerror'
/usr/lib/gcc/x86_64-linux-gnu/4.7/../../../x86_64-linux-gnu/libcrypto.a(dso_dlfcn.o): In function `dlfcn_bind_var':
(.text+0x474): undefined reference to `dlsym'
/usr/lib/gcc/x86_64-linux-gnu/4.7/../../../x86_64-linux-gnu/libcrypto.a(dso_dlfcn.o): In function `dlfcn_bind_var':
(.text+0x52e): undefined reference to `dlerror'
/usr/lib/gcc/x86_64-linux-gnu/4.7/../../../x86_64-linux-gnu/libcrypto.a(dso_dlfcn.o): In function `dlfcn_load':
(.text+0x5a2): undefined reference to `dlopen'
/usr/lib/gcc/x86_64-linux-gnu/4.7/../../../x86_64-linux-gnu/libcrypto.a(dso_dlfcn.o): In function `dlfcn_load':
(.text+0x60b): undefined reference to `dlclose'
/usr/lib/gcc/x86_64-linux-gnu/4.7/../../../x86_64-linux-gnu/libcrypto.a(dso_dlfcn.o): In function `dlfcn_load':
(.text+0x638): undefined reference to `dlerror'
/usr/lib/gcc/x86_64-linux-gnu/4.7/../../../x86_64-linux-gnu/libcrypto.a(dso_dlfcn.o): In function `dlfcn_pathbyaddr':
(.text+0x6cd): undefined reference to `dladdr'
/usr/lib/gcc/x86_64-linux-gnu/4.7/../../../x86_64-linux-gnu/libcrypto.a(dso_dlfcn.o): In function `dlfcn_pathbyaddr':
(.text+0x731): undefined reference to `dlerror'
/usr/lib/gcc/x86_64-linux-gnu/4.7/../../../x86_64-linux-gnu/libcrypto.a(dso_dlfcn.o): In function `dlfcn_unload':
(.text+0x78a): undefined reference to `dlclose'
/usr/lib/gcc/x86_64-linux-gnu/4.7/../../../x86_64-linux-gnu/libcrypto.a(c_zlib.o): In function `bio_zlib_free':
(.text+0x4d): undefined reference to `inflateEnd'
/usr/lib/gcc/x86_64-linux-gnu/4.7/../../../x86_64-linux-gnu/libcrypto.a(c_zlib.o): In function `bio_zlib_free':
(.text+0x6b): undefined reference to `deflateEnd'
/usr/lib/gcc/x86_64-linux-gnu/4.7/../../../x86_64-linux-gnu/libcrypto.a(c_zlib.o): In function `bio_zlib_ctrl':
(.text+0x284): undefined reference to `deflate'
/usr/lib/gcc/x86_64-linux-gnu/4.7/../../../x86_64-linux-gnu/libcrypto.a(c_zlib.o): In function `bio_zlib_ctrl':
(.text+0x342): undefined reference to `zError'
/usr/lib/gcc/x86_64-linux-gnu/4.7/../../../x86_64-linux-gnu/libcrypto.a(c_zlib.o): In function `zlib_stateful_expand_block':
(.text+0x411): undefined reference to `inflate'
/usr/lib/gcc/x86_64-linux-gnu/4.7/../../../x86_64-linux-gnu/libcrypto.a(c_zlib.o): In function `zlib_stateful_compress_block':
(.text+0x4ca): undefined reference to `deflate'
/usr/lib/gcc/x86_64-linux-gnu/4.7/../../../x86_64-linux-gnu/libcrypto.a(c_zlib.o): In function `zlib_stateful_finish':
(.text+0x51f): undefined reference to `inflateEnd'
/usr/lib/gcc/x86_64-linux-gnu/4.7/../../../x86_64-linux-gnu/libcrypto.a(c_zlib.o): In function `zlib_stateful_finish':
(.text+0x528): undefined reference to `deflateEnd'
/usr/lib/gcc/x86_64-linux-gnu/4.7/../../../x86_64-linux-gnu/libcrypto.a(c_zlib.o): In function `zlib_stateful_init':
(.text+0x5d7): undefined reference to `inflateInit_'
/usr/lib/gcc/x86_64-linux-gnu/4.7/../../../x86_64-linux-gnu/libcrypto.a(c_zlib.o): In function `zlib_stateful_init':
(.text+0x659): undefined reference to `deflateInit_'
/usr/lib/gcc/x86_64-linux-gnu/4.7/../../../x86_64-linux-gnu/libcrypto.a(c_zlib.o): In function `bio_zlib_read':
(.text+0x893): undefined reference to `inflate'
/usr/lib/gcc/x86_64-linux-gnu/4.7/../../../x86_64-linux-gnu/libcrypto.a(c_zlib.o): In function `bio_zlib_read':
(.text+0x90d): undefined reference to `zError'
/usr/lib/gcc/x86_64-linux-gnu/4.7/../../../x86_64-linux-gnu/libcrypto.a(c_zlib.o): In function `bio_zlib_read':
(.text+0x97c): undefined reference to `inflateInit_'
/usr/lib/gcc/x86_64-linux-gnu/4.7/../../../x86_64-linux-gnu/libcrypto.a(c_zlib.o): In function `bio_zlib_write':
(.text+0xa6f): undefined reference to `deflate'
/usr/lib/gcc/x86_64-linux-gnu/4.7/../../../x86_64-linux-gnu/libcrypto.a(c_zlib.o): In function `bio_zlib_write':
(.text+0xaec): undefined reference to `zError'
/usr/lib/gcc/x86_64-linux-gnu/4.7/../../../x86_64-linux-gnu/libcrypto.a(c_zlib.o): In function `bio_zlib_write':
(.text+0xb7e): undefined reference to `deflateInit_'
collect2: error: ld returned 1 exit status
How can I make this? I remember that a while ago I did this but now, erm, forgot how to do it. Im on Ubuntu 13.04 x64- can it be an issue?
我怎样才能做到这一点？我记得不久前我做了这个，但现在，呃，忘记了怎么做。我在 Ubuntu 13.04 x64 上- 这会是个问题吗？
回答by user4035357
I had a similar issue trying to statically compile a simple DES program using the openssl lib. I used -lcrypto -lz -ldl -static-libgccand it worked for me. No warnings or errors.
我在尝试使用 openssl 库静态编译一个简单的 DES 程序时遇到了类似的问题。我用过-lcrypto -lz -ldl -static-libgcc，它对我有用。没有警告或错误。
回答by drahnr
You need to be aware that librariesneed to availiable as statically linked *.a files. If they are not, then compilation will either fail or you end up with a dynamically linked executable.
您需要注意，库需要作为静态链接的 *.a 文件可用。如果不是，那么编译要么失败，要么最终得到一个动态链接的可执行文件。
If this gets too much PITA (all the libraries dependencies need to be statically compiled to, and their deps too and so on) use something like buildroot
如果这得到了太多的 PITA（所有库依赖项都需要静态编译，它们的 deps 等等）使用类似buildroot 的东西
回答by peterh - Reinstate Monica
A hotfix: try to link in libdl statically, too.
修补程序：也尝试静态链接 libdl。
If this not works, IMHO your libcrypto.a is bad compiled.
如果这不起作用，恕我直言，您的 libcrypto.a 编译错误。
回答by schulwitz
I had the same problem as you. Here's the command that solved it for me:
我和你有同样的问题。这是为我解决它的命令：
gcc yourfile.c -o yourfile -static -lcrypto -lz -ldl
It generates this warning:
它生成此警告：
/usr/lib/gcc/i686-linux-gnu/4.7/../../../i386-linux-gnu/libcrypto.a(dso_dlfcn.o): In function `dlfcn_globallookup': (.text+0x1b): warning: Using 'dlopen' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
but the executable still works.
但可执行文件仍然有效。
