#!/bin/sh
set -e

PREFIX="$PWD/toolchain"
TARGET=x86_64-linux-musl
ARCH=x86_64
export CFLAGS='-Os -pipe'
export CXXFLAGS="$CFLAGS"
export PATH="$PREFIX/bin:$PATH"
export MAKEFLAGS="-j$(nproc)"

mkdir -p "$PREFIX/src"
( cd "$PREFIX/src"
    wget -c https://ftp.gnu.org/gnu/binutils/binutils-2.30.tar.xz
    wget -c https://ftp.gnu.org/gnu/gcc/gcc-8.1.0/gcc-8.1.0.tar.xz
    wget -c https://ftp.gnu.org/gnu/gmp/gmp-6.1.2.tar.xz
    wget -c https://ftp.gnu.org/gnu/mpfr/mpfr-4.0.1.tar.xz
    wget -c https://ftp.gnu.org/gnu/mpc/mpc-1.1.0.tar.gz
    wget -c http://isl.gforge.inria.fr/isl-0.19.tar.xz
    wget -c https://cdn.kernel.org/pub/linux/kernel/v4.x/linux-4.16.7.tar.xz
    wget -c https://www.musl-libc.org/releases/musl-1.1.19.tar.gz
    wget -c http://sigrok.org/download/source/libserialport/libserialport-0.1.1.tar.gz
)

( cd "$PREFIX/src"
    rm -rf binutils-*/
    tar xf binutils-*.tar.xz
    cd binutils-*/
    mkdir build
    cd build
    ../configure --prefix="$PREFIX" --target="$TARGET" --disable-nls --disable-multilib
    make
    make install
)

( cd "$PREFIX/src"
    rm -rf gcc-*/
    tar xf gcc-*.tar.xz
    cd gcc-*/
    tar xf ../gmp-*.tar.xz
    tar xf ../mpfr-*.tar.xz
    tar xf ../mpc-*.tar.gz
    tar xf ../isl-*.tar.xz
    mv gmp-*/ gmp
    mv mpfr-*/ mpfr
    mv mpc-*/ mpc
    mv isl-*/ isl
    mkdir build
    cd build
    ../configure --prefix="$PREFIX" --target="$TARGET" --disable-nls --disable-multilib --disable-libsanitizer --disable-libmpx --enable-languages=c,c++
    make all-gcc
    make install-gcc
)

( cd "$PREFIX/src"
    rm -rf linux-*/
    tar xf linux-*.tar.xz
    cd linux-*/
    make ARCH="$ARCH" INSTALL_HDR_PATH="$PWD/install" headers_install
    find install -type f -a ! -name '*.h' -delete
    cp -aT install/include "$PREFIX/$TARGET/include"
)

( cd "$PREFIX/src"
    rm -rf musl-*/
    tar xf musl-*.tar.gz
    cd musl-*/
    ./configure --prefix="$PREFIX/$TARGET" --host="$TARGET" --syslibdir='$(prefix)/lib'
    make install-headers
)

( cd "$PREFIX/src"
    cd gcc-*/build
    make MAKE='make enable_shared=no' all-target-libgcc
    make MAKE='make enable_shared=no' install-target-libgcc
)

( cd "$PREFIX/src"
    cd musl-*/
    make LIBCC="$PREFIX/lib/gcc/$TARGET/*/libgcc.a" install
)

( cd "$PREFIX/src"
    cd gcc-*/build
    make
    make install
)

( cd "$PREFIX/src"
    rm -rf libserialport-*/
    tar xf libserialport-*.tar.gz
    cd libserialport-*/
    ./configure --prefix="$PREFIX/$TARGET" --host="$TARGET"
    make
    make install
)

( cd "$PREFIX/src"
    rm -rf binutils-*/
    rm -rf gcc-*/
    rm -rf linux-*/
    rm -rf musl-*/
    rm -rf libserialport-*/
    #find "$PREFIX" -type f -name '*.la' -delete
)

cat > "$PREFIX/env" << EOF
export PATH="$PREFIX/bin:\$PATH"
EOF

echo 'Run "source toolchain/env" before running make!'