#!/bin/sh

#
# Paths to use for the build
#
# CC_SOURCE is where the tarballs for various components live.
# CC_ROOT is the top level directory for the tool chain build.
# CC_PREFIX is where the x86 cross build tools are created.
# CC_SYSROOT is where the "fake" x86_64 system and system libraries live.
#
CC_SOURCE=$HOME/crosscomp
CC_ROOT=$HOME/crosscomp/inst
CC_SYSROOT=$CC_ROOT/x86_64
CC_PREFIX=$CC_ROOT/usr

cd $CC_ROOT
mkdir tmp
cd tmp

# Step 1: binutils

tar -jxf $CC_SOURCE/binutils-2.16.1.tar.bz2
mkdir binutils
cd binutils
../binutils-2.16.1/configure --target=x86_64-linux-gnu --prefix=$CC_PREFIX --with-sysroot=$CC_SYSROOT
make
make install
PATH_BAK=$PATH
PATH=$PATH:$CC_PREFIX/bin
cd ..

# Step 2: kernel headers

tar -jxf $CC_SOURCE/linux-2.6.20.1.tar.bz2
cd linux-2.6.20.1
# Say yes to all the boring kernel config questions
yes "" | make ARCH=x86_64 CROSS_COMPILE=x86_64-linux-gnu- oldconfig
# Note: Some errors as there is no cross-compiler yet
make ARCH=x86_64 CROSS_COMPILE=x86_64-linux-gnu- prepare

mkdir $CC_SYSROOT
mkdir $CC_SYSROOT/usr
mkdir $CC_SYSROOT/usr/include
cp -a include/linux include/asm-generic $CC_SYSROOT/usr/include
cp -a include/asm-x86_64 $CC_SYSROOT/usr/include/asm
cd ..

# Step 3: glibc headers

tar -jxf $CC_SOURCE/glibc-2.5.tar.bz2
tar -jxf $CC_SOURCE/glibc-linuxthreads-2.5.tar.bz2 -C glibc-2.5
mkdir glibc1
cd glibc1
../glibc-2.5/configure --build=i686-pc-linux-gnu --host=x86_64-linux-gnu --with-headers=$CC_SYSROOT/usr/include --prefix=/usr --enable-add-ons=linuxthreads --disable-sanity-checks
make install-headers install_root=$CC_SYSROOT

# Fudge 1: glibc header install needs some help before this
# is useable by the initial gcc build
touch $CC_SYSROOT/usr/include/gnu/stubs.h
cp -a bits/stdio_lim.h $CC_SYSROOT/usr/include/bits
cd ..

# Step 4: static only gcc

tar -jxf $CC_SOURCE/gcc-core-4.2.0.tar.bz2
tar -jxf $CC_SOURCE/gcc-g++-4.2.0.tar.bz2
mkdir gcc1
cd gcc1
../gcc-4.2.0/configure --prefix=${CC_PREFIX} --target=x86_64-linux-gnu --with-sysroot=$CC_SYSROOT --enable-languages=c --disable-shared --disable-libmudflap --disable-libssp --disable-multilib
make all-host
make install-host
cd ..

# Fudge 2: Make dummy "eh" libgcc, glibc build thinks it needs it
ar rc $CC_PREFIX/lib/gcc/x86_64-linux-gnu/4.2.0/libgcc_eh.a

# Step 5: glibc

mkdir glibc2
cd glibc2
../glibc-2.5/configure --build=i686-pc-linux-gnu --host=x86_64-linux-gnu --with-headers=$CC_SYSROOT/usr/include --prefix=/usr --enable-add-ons=linuxthreads --disable-sanity-checks
make
make install install_root=$CC_SYSROOT

# Fudge 3: We're compiling gcc without multilib so that we don't have to 
# build a 32 bit glibc too (we're not interested), so we symlink lib to lib64
# so that gcc can find the needed glibc libraries in a non-multilib place
ln -s lib64 $CC_SYSROOT/lib
ln -s lib64 $CC_SYSROOT/usr/lib


# Step 6: gcc full

cd ..
mkdir gcc2
cd gcc2
../gcc-4.2.0/configure --prefix=${CC_PREFIX} --target=x86_64-linux-gnu --with-sysroot=$CC_SYSROOT --disable-multilib
make
make install