Cross compiling "OpenSSL" Error

c, cross-compiling, linux, openssl

Solution

I know this question is a little old, but since I came to it with the same problem, I'm going to leave this here for future reference.

The solution I found was to manually compile OpenSSL with the installed cross-compiler and then manually install it to the cross-compilation libraries folder.

First, I installed the cross-compiler (I'm using Ubuntu 14.04). I installed both the C compiler and the C++ compiler. I also installed two cross-compiler toolchains, one with hard-floating point support (arm-linux-gnueabihf) and one without (arm-linux-gnueabi). Two directories are created (as noted on the question) `/usr/arm-linux-gnueabi` and `/usr/arm-linux-gnueabihf`, where the cross-compiled libraries should be installed to.

sudo apt-get install {gcc,g++}-arm-linux-gnueabi{,hf}

Secondly, cloned the OpenSSL Git repository and checked out the version I was interested in (1.0.2):

git clone https://github.com/openssl/openssl
git checkout OpenSSL_1_0_2       # or another version

Then, I configured the environment for cross-compilation and changed the installation directory (the prefix), and built the library following the instructions provided in the INSTALL file (and by forcing to use the specific cross-compilation toolchain):

export CROSS=arm-linux-gnueabi # or arm-linux-gnueabihf
export AR=${CROSS}-ar
export AS=${CROSS}-as
export CC=${CROSS}-gcc
export CXX=${CROSS}-g++
export LD=${CROSS}-ld

./Configure --prefix=/usr/${CROSS} os/compiler:${CC}
make
sudo make install

You can repeat the process and compile with both toolchains (`arm-linux-gnueabi` and `arm-linux-gnueabihf`).

Hope this helps.

Problem

I'm using the include: < openssl/md5.h > in my c code. When I compile it with "gcc" compiler I don't have any errors, but when I compile it with cross compiler "arm-linux-gnueabi-gcc" I have the following error: ``` /usr/include/openssl/e_os2.h:56:33: fatal error: openssl/opensslconf.h: No such file or directory compilation terminated. ``` I think that this error is because I don't have the openssl libraries in the cross compiler folder "/usr/arm-linux-gnueabi-gcc". Can anyone say me if is this the cause of the error? And how I can install the openssl libraries for cross compiler? I'm starting in cross-compiling, and I don't have much knowledge about this. Thanks for your time!

Original source