cross2

linux C libraries:glibc, uclib, musl
binutils: collection of binary tools; ld(linker, links multiple objects into a shared library, an excecutable , or another object file). as(assemlber, produces a binary code object from an assembly txt file). debugging/analysis tools, ranlib...Binutils needs to be configured for the target cpu arch.



#sudo apt install gcc-mips-linux-gnu
#man mips-linux-gnu-gcc
#mips-linux-gnu-gcc --help
#https://shadowllife.wordpress.com/2018/05/04/how-to-cross-compile-openssh/
#https://stackoverflow.com/questions/11841919/cross-compile-openssh-for-arm
#http://papermint-designs.com/dmo-blog/2016-04-having-fun-with-your-home-router
#https://stackoverflow.com/questions/12183433/compile-parameters-for-mips-based-codesourcery-toolchain
##################################
#Static Builds
If for some reason you want the resulting toolchain binaries to be statically linked, set the following environment variables before running crosstool.sh (or all.sh):

BINUTILS_EXTRA_CONFIG="LDFLAGS=-all-static"
GCC_EXTRA_CONFIG="LDFLAGS=-static"
#############################
#http://www.kegel.com/crosstool/
#-static -EB -march=mips32


#Make a working directory for all the downloads and builds
mkdir /home/$(whoami)/mips
export WORKDIR=/home/$(whoami)/mips

#Path of the output folder for the intermediate and the final installs
mkdir /home/$(whoami)/mips/rootfs
export ROOTFS=/home/$(whoami)/mips/rootfs

#Download and install cross-compiler
cd $WORKDIR
wget https://sourcery.mentor.com/GNUToolchain/package14486/public/mips-linux-gnu/mips-2016.05-8-mips-linux-gnu-i686-pc-linux-gnu.tar.bz2
tar -xf mips-2016.05-8-mips-linux-gnu-i686-pc-linux-gnu.tar.bz2

#GNU Cross-Compiler Bin folder path
export GCC_PATH=/${WORKDIR}/mips-2016.05/bin

#Include and Lib paths for the intermediate compiled for the target-system libraries and headers
CFLAGS="-I${ROOTFS}/usr/include" LDFLAGS="-L${ROOTFS}/usr/lib"

#Let the system know where the compiler excecutables are
export PATH=${GCC_PATH}:$PATH

#Compiler excecutable
export HOST=mips-linux-gnu


############################################
# Zlib intermediate cross-compile commands #
############################################

#Download, extract and cross-compile Zlib
cd $WORKDIR
wget https://www.zlib.net/zlib-1.2.11.tar.gz
tar -xvf zlib-1.2.11.tar.gz
cd zlib-1.2.11

CC=${HOST}-gcc AR=${HOST}-ar RANLIB=${HOST}-ranlib ./configure --prefix=$ROOTFS/usr
make LDFLAGS="-EB -march=mips32"
make install



#########################
# OPENSSL CROSS COMPILE #
#########################

###this is for runtime library paths search
'-Wl,-rpath,$(LIBRPATH)'
###

### prefix

    --prefix=DIR

The top of the installation directory tree.  Defaults are:

    Unix:           /usr/local

### libdir

    --libdir=DIR

The name of the directory under the top of the installation directory tree
(see the `--prefix` option) where libraries will be installed.  By default
this is `lib/`. Note that on Windows only static libraries (`*.lib`) will
be stored in this location. Shared libraries (`*.dll`) will always be
installed to the `bin/` directory.

### openssldir

    --openssldir=DIR

Directory for OpenSSL configuration files, and also the default certificate
and key store.  Defaults are:

    Unix:           /usr/local/ssl

#Also, note that `--openssldir` refers to target's file system, not one you are
building on.


#Download Openssh and install
cd $WORKDIR
git clone https://github.com/openssl/openssl
cd openssl

#Openssl intermediate cross-compile commands
#makefile: DESTDIR=$ROOTFS

./Configure linux-mips32 shared zlib-dynamic \
--cross-compile-prefix=mips-buildroot-linux-uclibc- \
--prefix=/usr \
--libdir=/usr/lib \
--openssldir=/usr/etc/ssl \
--with-zlib-include=$ROOTFS/usr/include \
--with-zlib-lib=$ROOTFS/usr/lib

make CFLAGS="-I${ROOTFS}/usr/include" LDFLAGS="-L${ROOTFS}/usr/lib"
make install

#########################
# OPENSSH CROSS COMPILE #
#########################

cd $WORKDIR
git clone https://github.com/openssh/openssh-portable
cd openssh-portable

#makefile: DESTDIR=$ROOTFS
./configure \
CC=mips-linux-gnu-gcc AR=mips-linux-gnu-ar \
--host=mips-32 \
--build=i386-pc-linux-gnu \
--prefix=/usr \
--exec-prefix=/usr \
--bindir=/usr/bin \
--sbindir=/usr/sbin \
--libdir=/lib \
--libexecdir=/usr/sbin \
--sysconfdir=/etc \
--datadir=/usr/share \
--localstatedir=/var \
--mandir=/usr/man \
--infodir=/usr/info \
--disable-lastlog --disable-utmp \
--disable-utmpx --disable-wtmp --disable-wtmpx \
--with-libs --with-zlib=${ROOTFS}/usr/lib --with-openssl=${ROOTFS}/usr/lib \
--disable-strip

#makefile: delete check-config from install script

make && make install