编译和Ubuntu上联VS的OpenSSL OSX [英] Compiling and linking OpenSSL on Ubuntu vs OSX

问题描述

尝试1，香草链接库

我想使用OpenSSL（所以DTLS更容易使用）的一个补丁版本。 OpenSSL是在

I'm trying to use a patched version of OpenSSL (so DTLS is easier to use). OpenSSL is in

/usr/local/openssl-1.0.1c

该./include/openssl子文件夹有一吨的头文件（因为我认为它应该）：

The ./include/openssl subfolder has a ton of header files (as I assume it should):

lrwxrwxrwx 1 root root   22 Dec 25 05:49 aes.h -> ../../crypto/aes/aes.h
lrwxrwxrwx 1 root root   24 Dec 25 05:49 asn1.h -> ../../crypto/asn1/asn1.h
lrwxrwxrwx 1 root root   28 Dec 25 05:49 asn1_mac.h -> ../../crypto/asn1/asn1_mac.h
...

GCC链接到包含文件夹，并给了我一个错误 - 它无法找到SSL。我使用或多或少同样的事情，其他人都。这工作，在OSX（10.6），但不是在Ubuntu的：

GCC links to the include folder and gives me an error- it cannot find SSL. I'm using more or less the same thing other people are. This works, on OSX (10.6), but not on Ubuntu:

~$ gcc -L/usr/local/openssl-1.0.1c/include -lssl -lcrypto  -o server server.c
server.c:20:25: fatal error: openssl/ssl.h: No such file or directory
compilation terminated.

2的尝试，符号链接库在/ usr /包含

所以，后来我尝试创建符号链接到我的OpenSSL / usr / include目录：

So, then I try creating a symbolic link to OpenSSL in my /usr/include:

sudo ln -s /usr/local/openssl-1.0.1c/include/openssl /usr/include/openssl

和重新尝试编译：

~$ gcc -L/usr/local/openssl-1.0.1c/include -lssl -lcrypto  -o server server.c
/usr/bin/ld: cannot find -lssl
/usr/bin/ld: cannot find -lcrypto
collect2: ld returned 1 exit status
make: *** [server] Error 1

为什么第一个方法（即无符号连接）不工作？权限？为什么第二种方法不工作？为什么在OSX这项工作？

推荐答案

与未找到头文件的问题似乎你混淆你的选择。 -L 添加到链接程序库搜索路径的路径，而 -I 添加目录到preprocessor头文件搜索路径。更改 -L 到 -I 来解决这个问题：

The problem with the header file not being found seems to be you mixing up your options. -L adds a path to the linker library search paths, while -I adds a directory to the preprocessor header file search path. Change the -L to -I to solve that problem:

$ gcc -I/usr/local/openssl-1.0.1c/include server.c -o server.o

现在的问题链接是因为你错误地使用 -L 选项告诉链接器查找在include路径库。你需要的路径更改为在库的目录，通常为 LIB 子目录。此外，连接器希望在它们的依赖相反的顺序库，所以把你想在命令行上与去年链接库：

Now the linker problem is because you erroneously use the -L option to tell the linker to look for libraries in the include path. You need to change that path to the directory where the libraries are, usually a lib subdirectory. Also, the linker wants libraries in reverse order of their dependencies, so place the libraries you want to link with last on the command line:

$ gcc -I/usr/local/openssl-1.0.1c/include server.c -o server.o \
    -L/usr/local/openssl-1.0.1c/lib -lssl -lcrypto

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