Cross Compiling

Issues:

• need cross compile toolchain
• need to cross compile any dependencies (static link what you can)

libz example

echo Getting source code for libraries... if [ ! -d zlib ]; then wget http://zlib.net/zlib-${zlib_version}.tar.gz untar zlib-${zlib_version}.tar.gz ln -s zlib-${zlib_version} zlib fi echo Building libraries... if [ "$rebuild_libs" = true ]; then export cross=arm-linux-gnueabi- # ZLIB cd zlib ./configure --prefix=${install_root} make CC="${cross}gcc" AR="${cross}ar r" RANLIB="${cross}ranlib" make install cd .. fi

• • openssl example

   echo Getting source code for libraries...
   if [ ! -d openssl ]; then
       wget https://www.openssl.org/source/openssl-${openssl_version}.tar.gz
       untar openssl-${openssl_version}.tar.gz
       ln -s openssl-${openssl_version} openssl
   fi
   
   echo Building libraries...
   
   if [ "$rebuild_libs" = true ]; then
   
       export cross=arm-linux-gnueabi-
   
       # OPENSSL
       cd openssl
       ./Configure dist --prefix=${install_root} --openssldir=${install_root}
       make CC="${cross}gcc" AR="${cross}ar r" RANLIB="${cross}ranlib"
       make install
       cd ..
   fi

• • libwebsockets example
• need to match the libraries on target machine for any dynamic linking requirements
• need to match the build to the target kernel (or you might get "kernel too old")