Compiling a cross compiler for armv7l-unknown-linux-gnueabihf (RPi3)

instructions.txt

wget http://ftp.snt.utwente.nl/pub/software/gnu/binutils/binutils-2.29.tar.xz                                                               
wget ftp://ftp.nluug.nl/mirror/languages/gcc/releases/gcc-7.2.0/gcc-7.2.0.tar.xz                                                            
wget http://ftp.gnu.org/gnu/glibc/glibc-2.26.tar.xz                   
tar xvf binutils-2.29.tar.xz       
tar xvf gcc-7.2.0.tar.xz           
cd binutils-2.29                   
./configure --target=armv7l-unknown-linux-gnueabihf --disable-multilib
make -j9                           
sudo make install                  
cd ..                              
scp drone:headers.tar.gz .         
cd /usr/local/armv7l-unknown-linux-gnueabihf                          
sudo tar xzvf $OLDPWD/headers.tar.gz                                  
cd -                               
cd gcc-7.2.0                       
./contrib/download_prerequisites   
mkd ../gcc-build                   
../gcc-7.2.0/configure --enable-languages=c,c++,lto --enable-shared --enable-threads=posix --with-system-zlib --with-isl --enable-__cxa_atexit --disable-libunwind-exceptions --enable-clocale=gnu --disable-libstdcxx-pch --disable-libssp --enable-gnu-unique-object --enable-linker-build-id --enable-lto --enable-plugin --enable-install-libiberty --with-linker-hash-style=gnu --enable-gnu-indirect-function --disable-multilib --disable-werror --enable-checking=release --target=armv7l-unknown-linux-gnueabihf --with-arch=armv7-a --with-float=hard --with-fpu=vfpv3-d16                               
make -j9 all-gcc                   
sudo make install-gcc              
cd ..                              
tar xvf glibc-2.26.tar.xz          
mkd glibc-build                    
../glibc-2.26/configure --prefix=/usr/local/armv7l-unknown-linux-gnueabihf --build=$MACHTYPE --host=armv7l-unknown-linux-gnueabihf --target=armv7l-unknown-linux-gnueabihf --with-headers=/usr/local/armv7l-unknown-linux-gnueabihf/include --disable-multilib libc_cv_forced_unwind=yes
make -j9 # This fails, but it does succeed buildling the parts we need now.                                                                 
sudo make install-bootstrap-headers=yes install-headers                                                                                     
sudo install csu/crt1.o csu/crti.o csu/crtn.o /usr/local/armv7l-unknown-linux-gnueabihf/lib/                                                
sudo touch /usr/local/armv7l-unknown-linux-gnueabihf/include/gnu/stubs.h                                                                    
sudo /usr/local/bin/armv7l-unknown-linux-gnueabihf-gcc -nostdlib -nostartfiles -shared -x c /dev/null -o /usr/local/armv7l-unknown-linux-gnueabihf/lib/libc.so                                                                                                                          
cd ../gcc-build                                                                                                                             
make -j9 all-target-libgcc                                                                                                                  
sudo make install-target-libgcc                                                                                                             
cd ../glibc-build                                                                                                                           
make -j9                                                                                                                                    
sudo make install                                                                                                                           
cd ../gcc-build                                                                                                                             
make -j9                                                                                                                                    
sudo make install 

Thank you for posting this. I'm building a toolchain for the Marvell Armada processor in the Drobo 5N NAS, and this recipe saved me so much time!