#!/bin/bash

BINUTILS_VERSION="2.35"
BINUTILS_CHECKSUM="1b11659fb49e20e18db460d44485f09442c8c56d5df165de9461eb09c8302f85"
GCC_VERSION="10.2.0"
GCC_CHECKSUM="b8dd4368bb9c7f0b98188317ee0254dd8cc99d1e3a18d0ff146c855fe16c1d8c"

if [ ! -e binutils-${BINUTILS_VERSION}.tar.xz ]; then
  wget -O binutils-${BINUTILS_VERSION}.tar.xz https://ftp.gnu.org/gnu/binutils/binutils-${BINUTILS_VERSION}.tar.xz
fi

if [[ ! `sha256sum binutils-${BINUTILS_VERSION}.tar.xz` =~ $BINUTILS_CHECKSUM ]]; then
  echo "Invalid binutils-${BINUTILS_VERSION}.tar.xz checksum"
  exit
fi

if [ ! -d binutils-${BINUTILS_VERSION} ]; then
  tar xJf binutils-${BINUTILS_VERSION}.tar.xz
fi

if [ ! -e gcc-${GCC_VERSION}.tar.xz ]; then
  wget -O gcc-${GCC_VERSION}.tar.xz https://ftp.gnu.org/gnu/gcc/gcc-${GCC_VERSION}/gcc-${GCC_VERSION}.tar.xz
fi

if [[ ! `sha256sum gcc-${GCC_VERSION}.tar.xz` =~ $GCC_CHECKSUM ]]; then
  echo "Invalid gcc-${GCC_VERSION}.tar.xz checksum"
  exit
fi

if [ ! -d gcc-${GCC_VERSION} ]; then
  tar xJf gcc-${GCC_VERSION}.tar.xz
fi

export PREFIX="$PWD/i686-elf-gcc"
export TARGET="i686-elf"
export PATH="$PREFIX/bin:$PATH"

function build_binutils()
{
  rm -rf build-binutils
  mkdir -p build-binutils
  (
    cd build-binutils
    ../binutils-${BINUTILS_VERSION}/configure --target="$TARGET" --prefix="$PREFIX" --with-sysroot --disable-nls --disable-werror && \
    make && \
    make install
  )
}

function build_gcc()
{
  rm -rf build-gcc
  mkdir -p build-gcc
  (
    cd build-gcc
    ../gcc-${GCC_VERSION}/configure --target="$TARGET" --prefix="$PREFIX" --disable-nls --enable-languages=c,c++ --without-headers && \
    make all-gcc && \
    make all-target-libgcc && \
    make install-gcc && \
    make install-target-libgcc
  )
}

build_binutils && build_gcc