#!/usr/bin/env bash

set -x
set -euo pipefail

# shellcheck disable=SC1091
. lib.sh

main() {
    local nproc=
    local binutils=2.32 \
          dragonfly=6.0.1_REL \
          gcc=5.3.0 \
          target=x86_64-unknown-dragonfly \
          url="https://mirror-master.dragonflybsd.org/iso-images"
    if [[ $# != "0" ]]; then
        nproc="${1}"
    fi

    install_packages bsdtar \
        bzip2 \
        ca-certificates \
        curl \
        g++ \
        make \
        patch \
        wget \
        xz-utils

    local td
    td="$(mktemp -d)"

    pushd "${td}"
    mkdir "${td}"/{binutils,gcc}{,-build} "${td}/dragonfly"

    curl --retry 3 -sSfL "https://ftp.gnu.org/gnu/binutils/binutils-${binutils}.tar.bz2" -O
    tar -C "${td}/binutils" --strip-components=1 -xjf "binutils-${binutils}.tar.bz2"

    curl --retry 3 -sSfL "https://ftp.gnu.org/gnu/gcc/gcc-${gcc}/gcc-${gcc}.tar.gz" -O
    tar -C "${td}/gcc" --strip-components=1 -xf "gcc-${gcc}.tar.gz"

    cd gcc
    sed -i -e 's/ftp:/https:/g' ./contrib/download_prerequisites
    ./contrib/download_prerequisites
    patch -p0 <<'EOF'
--- libatomic/configure.tgt.orig   2015-07-09 16:08:55 UTC
+++ libatomic/configure.tgt
@@ -110,7 +110,7 @@ case "${target}" in
   ;;

   *-*-linux* | *-*-gnu* | *-*-k*bsd*-gnu \
-  | *-*-netbsd* | *-*-freebsd* | *-*-openbsd* \
+  | *-*-netbsd* | *-*-freebsd* | *-*-openbsd* | *-*-dragonfly* \
   | *-*-solaris2* | *-*-sysv4* | *-*-irix6* | *-*-osf* | *-*-hpux11* \
   | *-*-darwin* | *-*-aix* | *-*-cygwin*)
   # POSIX system.  The OS is supported.
EOF

    patch -p0 <<'EOF'
--- libstdc++-v3/config/os/bsd/dragonfly/os_defines.h.orig  2015-07-09 16:08:54 UTC
+++ libstdc++-v3/config/os/bsd/dragonfly/os_defines.h
@@ -29,4 +29,9 @@
 // System-specific #define, typedefs, corrections, etc, go here.  This
 // file will come before all others.

+#define _GLIBCXX_USE_C99_CHECK 1
+#define _GLIBCXX_USE_C99_DYNAMIC (!(__ISO_C_VISIBLE >= 1999))
+#define _GLIBCXX_USE_C99_LONG_LONG_CHECK 1
+#define _GLIBCXX_USE_C99_LONG_LONG_DYNAMIC (_GLIBCXX_USE_C99_DYNAMIC || !defined __LONG_LONG_SUPPORTED)
+
 #endif
EOF

    patch -p0 <<'EOF'
--- libstdc++-v3/configure.orig    2016-05-26 18:34:47.163132921 +0200
+++ libstdc++-v3/configure 2016-05-26 18:35:29.594590648 +0200
@@ -52013,7 +52013,7 @@

     ;;

-  *-freebsd*)
+  *-freebsd* | *-dragonfly*)
     SECTION_FLAGS='-ffunction-sections -fdata-sections'


EOF
    cd ..

    curl --retry 3 -sSfL "${url}/dfly-x86_64-${dragonfly}.iso.bz2" -O
    bzcat "dfly-x86_64-${dragonfly}.iso.bz2" | bsdtar xf - -C "${td}/dragonfly" ./usr/include ./usr/lib ./lib

    cd binutils-build
    ../binutils/configure \
        --target="${target}"
    make "-j${nproc}"
    make install
    cd ..

    # note: shell expansions can't be quoted
    local destdir="/usr/local/${target}"
    cp -r "${td}/dragonfly/usr/include" "${destdir}"/
    cp "${td}/dragonfly/lib/libc.so.8" "${destdir}/lib"
    cp "${td}/dragonfly/lib/libm.so.4" "${destdir}/lib"
    cp "${td}/dragonfly/lib/libutil.so.4" "${destdir}/lib"
    cp "${td}/dragonfly/usr/lib/libexecinfo.so.1" "${destdir}/lib"
    cp "${td}/dragonfly/usr/lib/libpthread.so" "${destdir}/lib/libpthread.so"
    cp "${td}/dragonfly/usr/lib/librt.so.0" "${destdir}/lib"
    cp "${td}"/dragonfly/usr/lib/lib{c,m,util,kvm}.a "${destdir}/lib"
    cp "${td}/dragonfly/usr/lib/thread/libthread_xu.so.2" "${destdir}/lib/libpthread.so.0"
    cp "${td}"/dragonfly/usr/lib/{crt1,Scrt1,crti,crtn}.o "${destdir}/lib/"

    ln -s libc.so.8 "${destdir}/lib/libc.so"
    ln -s libexecinfo.so.1 "${destdir}/lib/libexecinfo.so"
    ln -s libm.so.4 "${destdir}/lib/libm.so"
    ln -s librt.so.0 "${destdir}/lib/librt.so"
    ln -s libutil.so.4 "${destdir}/lib/libutil.so"

    cd gcc-build
    ../gcc/configure \
        --disable-libada \
        --disable-libcilkrts \
        --disable-libgomp \
        --disable-libquadmath \
        --disable-libquadmath-support \
        --disable-libsanitizer \
        --disable-libssp \
        --disable-libvtv \
        --disable-lto \
        --disable-multilib \
        --disable-nls \
        --enable-languages=c,c++ \
        --target="${target}"
    make "-j${nproc}"
    make install
    cd ..

    # rust incorrectly adds link args to libgcc_pic, which is no longer
    # a present target, and it should link to libgcc_s.
    # https://github.com/rust-lang/rust/blob/60361f2/library/unwind/build.rs#L23-L38
    ln -s "${destdir}"/lib/libgcc_s.so "${destdir}"/lib/libgcc_pic.so

    # clean up
    popd

    purge_packages

    # store the version info for the dragonfly release
    echo "${dragonfly}" > /opt/dragonfly-version

    rm -rf "${td}"
    rm "${0}"
}

main "${@}"