#!/bin/sh

# First install the following commands:
# * gcc
# * make
# * bison
# * flex
# * texi2any (texinfo package)
# * wget
# And the following libraries:
# * gmp (libgmp-dev)
# * mpc (libmpc-dev)
# * mpfr (libmpfr-dev)

BINUTILS_VERSION="2.35"
GCC_VERSION="10.2.0"
export PREFIX="$PWD/i686-elf-gcc"
export PATH="$PWD/i686-elf-gcc/bin:$PATH"
TARGET="i686-elf"

if [ -e "i686-elf-gcc" ]; then
  echo "Exiting since installation directory already present"
  exit 0
fi

# Download archives.
if [ ! -f binutils-$BINUTILS_VERSION.tar.xz ]; then
  wget "https://ftp.gnu.org/gnu/binutils/binutils-$BINUTILS_VERSION.tar.xz"
fi
if [ ! -f gcc-$GCC_VERSION.tar.xz ]; then
  wget "https://ftp.gnu.org/gnu/gcc/gcc-$GCC_VERSION/gcc-$GCC_VERSION.tar.xz"
fi

# Extract archives.
tar xJf binutils-$BINUTILS_VERSION.tar.xz
tar xJf gcc-$GCC_VERSION.tar.xz

# Build binutils.
rm -rf "build-binutils"
mkdir "build-binutils"
cd "build-binutils"
  ../binutils-$BINUTILS_VERSION/configure \
    --target="$TARGET" --prefix="$PREFIX" --with-sysroot --disable-nls \
    --disable-werror
  make
  make install
cd ..

# Build gcc.
rm -rf "build-gcc"
mkdir "build-gcc"
cd "build-gcc"
  ../gcc-$GCC_VERSION/configure \
    --target="$TARGET" --prefix="$PREFIX" --disable-nls \
    --enable-languages=c --without-headers
  make all-gcc
  make all-target-libgcc
  make install-gcc
  make install-target-libgcc
cd ..