#! /usr/bin/env bash

source util.sh

VERSION=$1
PREFIX="$2"
URL="https://ftp.gnu.org/gnu/gcc/gcc-$VERSION/gcc-$VERSION.tar.xz"
ARCHIVE=$(basename "$URL")

# Avoid rebuilds of the same version

existing_gcc="$PREFIX/bin/sh-elf-gcc"

if [[ -f "$existing_gcc" ]]; then
  existing_version=$(sh-elf-gcc --version | head -n 1 | grep -Eo '[0-9.]+$')
  if [[ $existing_version == $VERSION ]]; then
    echo "$TAG Version $VERSION already installed, skipping rebuild"
    if [[ -e build ]]; then
      rm -rf build
    fi
    exit 0
  fi
fi

# Aggressive parameter to avoid rebuilds

if [[ ! -z "$ACCEPT_ANY" ]]; then
  if command -v sh-elf-gcc >/dev/null 2>&1; then
    echo "$TAG sh-elf-gcc in PATH and ACCEPT_ANY is set, skipping build"
    if [[ -e build ]]; then
      rm -rf build
    fi
    exit 0
  fi
fi

# Download archive

if [[ -f "$ARCHIVE" ]]; then
  echo "$TAG Found $ARCHIVE, skipping download"
else
  echo "$TAG Downloading $URL..."
  if command -v curl >/dev/null 2>&1; then
    curl $URL -o $ARCHIVE
  elif command -v wget >/dev/null 2>&1; then
    wget -q --show-progress $URL -O $ARCHIVE
  else
    echo "$TAG error: no curl or wget; install one or download archive yourself" >&2
    exit 1
  fi
fi

# Extract archive (openBSD-compliant version)

echo "$TAG Extracting $ARCHIVE..."
unxz -c < $ARCHIVE | tar -xf -

# Create build folder

[[ -d "build" ]] && rm -rf build
mkdir build

# Configure. GCC does not support make uninstall so we install in this
# directory and later symlink executables to $PREFIX/bin.

PREFIX="$(pwd)"

# Symlink as, ld, ar and ranlib, which gcc will not find by itself (we renamed
# them from sh3eb-elf-* to sh-elf-* with --program-prefix).
mkdir -p sh3eb-elf/bin
ln -sf $(command -v sh-elf-as) sh3eb-elf/bin/as
ln -sf $(command -v sh-elf-ld) sh3eb-elf/bin/ld
ln -sf $(command -v sh-elf-ar) sh3eb-elf/bin/ar
ln -sf $(command -v sh-elf-ranlib) sh3eb-elf/bin/ranlib

cd build

# OpenBSD apparently installs these in /usr/local
if [[ $(uname) == "OpenBSD" ]]; then
  extra_args="--with-gmp=/usr/local --with-mpfr=/usr/local --with-mpc=/usr/local"
else
  extra_args=
fi

echo "$TAG Configuring gcc..."
run_quietly giteapc-configure.log \
../gcc-$VERSION/configure --prefix="$PREFIX" --target=sh3eb-elf --with-multilib-list=m3,m4-nofpu --enable-languages=c,c++ --without-headers --with-newlib --program-prefix=sh-elf- --enable-libssp --enable-lto $extra_args