#!/bin/bash -e

# TODO: Review and if possible fix shellcheck errors.
# shellcheck disable=all

# Last Update in 2024-0811

[ "${BASH_SOURCE[0]}" ] && SCRIPT_NAME="${BASH_SOURCE[0]}" || SCRIPT_NAME=$0
SCRIPT_DIR="$(cd "$(dirname "$SCRIPT_NAME")/.." && pwd -P)"
# gcc 13 is good
gcc_ver="13.2.0"
gcc_sha256="8cb4be3796651976f94b9356fa08d833524f62420d6292c5033a9a26af315078"
# use gcc 14 with caution, do not compatible with GPU-ABACUS
#gcc_ver="14.2.0"
#gcc_sha256="7d376d445f93126dc545e2c0086d0f647c3094aae081cdb78f42ce2bc25e7293"

source "${SCRIPT_DIR}"/common_vars.sh
source "${SCRIPT_DIR}"/tool_kit.sh
source "${SCRIPT_DIR}"/signal_trap.sh
source "${INSTALLDIR}"/toolchain.conf
source "${INSTALLDIR}"/toolchain.env

[ -f "${BUILDDIR}/setup_gcc" ] && rm "${BUILDDIR}/setup_gcc"

GCC_LDFLAGS=""
GCC_CFLAGS=""
TSANFLAGS=""
! [ -d "${BUILDDIR}" ] && mkdir -p "${BUILDDIR}"
cd "${BUILDDIR}"

case "${with_gcc}" in
  __INSTALL__)
    echo "==================== Installing GCC ===================="
    pkg_install_dir="${INSTALLDIR}/gcc-${gcc_ver}"
    #pkg_install_dir="${HOME}/apps/gcc/${gcc_ver}"
    install_lock_file="$pkg_install_dir/install_successful"
    if verify_checksums "${install_lock_file}"; then
      echo "gcc-${gcc_ver} is already installed, skipping it."
    else
      if [ -f gcc-${gcc_ver}.tar.gz ]; then
        echo "gcc-${gcc_ver}.tar.gz is found"
      else
        #download_pkg_from_ABACUS_org "${gcc_sha256}" "gcc-${gcc_ver}.tar.gz"
        url=https://mirrors.tuna.tsinghua.edu.cn/gnu/gcc/gcc-${gcc_ver}/gcc-${gcc_ver}.tar.gz
        download_pkg_from_url "${gcc_sha256}" "gcc-${gcc_ver}.tar.gz" "${url}"
      fi
    if [ "${PACK_RUN}" = "__TRUE__" ]; then
      echo "--pack-run mode specified, skip installation"
    else
      [ -d gcc-${gcc_ver} ] && rm -rf gcc-${gcc_ver}
      tar -xzf gcc-${gcc_ver}.tar.gz

      echo "Installing GCC from scratch into ${pkg_install_dir}"
      cd gcc-${gcc_ver}

      # Download prerequisites from cp2k.org because gcc.gnu.org returns 403 when queried from GCP.
      sed -i 's|http://gcc.gnu.org/pub/gcc/infrastructure/|https://cp2k.org/static/downloads/|' ./contrib/download_prerequisites
      ./contrib/download_prerequisites > prereq.log 2>&1 || tail -n ${LOG_LINES} prereq.log
      GCCROOT=${PWD}
      mkdir obj
      cd obj
      # TODO: Maybe use --disable-libquadmath-support to improve static linking:
      # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=46539
      #
      # TODO: Maybe use --disable-gnu-unique-object to improve static linking:
      # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=60348#c13
      # https://stackoverflow.com/questions/11931420
      #
      # TODO: Unfortunately, we can not simply use --disable-shared, because
      # it would break OpenBLAS build and probably others too.
      COMMON_FLAGS="-O2 -fPIC -fno-omit-frame-pointer -fopenmp -g"
      CFLAGS="${COMMON_FLAGS}"
      CXXFLAGS="${CFLAGS}"
      FCFLAGS="${COMMON_FLAGS} -fbacktrace"
      ${GCCROOT}/configure --prefix="${pkg_install_dir}" \
        --libdir="${pkg_install_dir}/lib" \
        --enable-languages=c,c++,fortran \
        --disable-multilib --disable-bootstrap \
        --enable-lto \
        --enable-plugins \
        > configure.log 2>&1 || tail -n ${LOG_LINES} configure.log
      make -j $(get_nprocs) \
        CFLAGS="${CFLAGS}" \
        CXXFLAGS="${CXXFLAGS}" \
        FCFLAGS="${FCFLAGS}" \
        > make.log 2>&1 || tail -n ${LOG_LINES} make.log
      make -j $(get_nprocs) install > install.log 2>&1 || tail -n ${LOG_LINES} install.log
      # thread sanitizer
      if [ ${ENABLE_TSAN} = "__TRUE__" ]; then
        # now the tricky bit... we need to recompile in particular
        # libgomp with -fsanitize=thread.. there is not configure
        # option for this (as far as I know).  we need to go in
        # the build tree and recompile / reinstall with proper
        # options...  this is likely to break for later version of
        # gcc, tested with 5.1.0 based on
        # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=55374#c10
        cd x86_64*/libgfortran
        make clean > clean.log 2>&1 || tail -n ${LOG_LINES} clean.log
        CFLAGS="${CFLAGS} -fsanitize=thread"
        CXXFLAGS="${CXXFLAGS} -fsanitize=thread"
        FCFLAGS="${FCFLAGS} -fsanitize=thread"
        make -j $(get_nprocs) \
          CFLAGS="${CFLAGS}" \
          CXXFLAGS="${CXXFLAGS}" \
          FCFLAGS="${FCFLAGS}" \
          LDFLAGS="-B$(pwd)/../libsanitizer/tsan/.libs/ -Wl,-rpath,$(pwd)/../libsanitizer/tsan/.libs/ -fsanitize=thread" \
          > make.log 2>&1 || tail -n ${LOG_LINES} make.log
        make install > install.log 2>&1 || tail -n ${LOG_LINES} install.log
        cd ../libgomp
        make clean > clean.log 2>&1 || tail -n ${LOG_LINES} clean.log
        make -j $(get_nprocs) \
          CFLAGS="${CFLAGS}" \
          CXXFLAGS="${CXXFLAGS}" \
          FCFLAGS="${FCFLAGS}" \
          LDFLAGS="-B$(pwd)/../libsanitizer/tsan/.libs/ -Wl,-rpath,$(pwd)/../libsanitizer/tsan/.libs/ -fsanitize=thread" \
          > make.log 2>&1 || tail -n ${LOG_LINES} make.log
        make install > install.log 2>&1 || tail -n ${LOG_LINES} install.log
        cd ${GCCROOT}/obj/
      fi
      cd ../..
      write_checksums "${install_lock_file}" "${SCRIPT_DIR}/stage0/$(basename ${SCRIPT_NAME})"
    fi
    fi
    if [ "${PACK_RUN}" = "__TRUE__" ]; then
        echo "--pack-run mode specified, skip system check"
    else
        check_install ${pkg_install_dir}/bin/gcc "gcc" && CC="${pkg_install_dir}/bin/gcc" || exit 1
        check_install ${pkg_install_dir}/bin/g++ "gcc" && CXX="${pkg_install_dir}/bin/g++" || exit 1
        check_install ${pkg_install_dir}/bin/gfortran "gcc" && FC="${pkg_install_dir}/bin/gfortran" || exit 1
        F90="${FC}"
        F77="${FC}"
        GCC_CFLAGS="-I'${pkg_install_dir}/include'"
        GCC_LDFLAGS="-L'${pkg_install_dir}/lib64' -L'${pkg_install_dir}/lib' -Wl,-rpath,'${pkg_install_dir}/lib64' -Wl,-rpath,'${pkg_install_dir}/lib64'"
    fi
    ;;
  __SYSTEM__)
    echo "==================== Finding GCC from system paths ===================="
    check_command gcc "gcc" && CC="$(command -v gcc)" || exit 1
    check_command g++ "gcc" && CXX="$(command -v g++)" || exit 1
    check_command gfortran "gcc" && FC="$(command -v gfortran)" || exit 1
    F90="${FC}"
    F77="${FC}"
    add_include_from_paths -p GCC_CFLAGS "c++" ${INCLUDE_PATHS}
    add_lib_from_paths GCC_LDFLAGS "libgfortran.*" ${LIB_PATHS}
    ;;
  __DONTUSE__)
    # Nothing to do
    ;;
  *)
    echo "==================== Linking GCC to user paths ===================="
    pkg_install_dir="${with_gcc}"
    check_dir "${pkg_install_dir}/bin"
    check_dir "${pkg_install_dir}/lib"
    check_dir "${pkg_install_dir}/lib64"
    check_dir "${pkg_install_dir}/include"
    check_command ${pkg_install_dir}/bin/gcc "gcc" && CC="${pkg_install_dir}/bin/gcc" || exit 1
    check_command ${pkg_install_dir}/bin/g++ "gcc" && CXX="${pkg_install_dir}/bin/g++" || exit 1
    check_command ${pkg_install_dir}/bin/gfortran "gcc" && FC="${pkg_install_dir}/bin/gfortran" || exit 1
    F90="${FC}"
    F77="${FC}"
    GCC_CFLAGS="-I'${pkg_install_dir}/include'"
    GCC_LDFLAGS="-L'${pkg_install_dir}/lib64' -L'${pkg_install_dir}/lib' -Wl,-rpath,'${pkg_install_dir}/lib64' -Wl,-rpath,'${pkg_install_dir}/lib64'"
    ;;
esac
if [ "${ENABLE_TSAN}" = "__TRUE__" ]; then
  TSANFLAGS="-fsanitize=thread"
else
  TSANFLAGS=""
fi
if [ "${with_gcc}" != "__DONTUSE__" ]; then
  cat << EOF > "${BUILDDIR}/setup_gcc"
export CC="${CC}"
export CXX="${CXX}"
export FC="${FC}"
export F90="${F90}"
export F77="${F77}"
EOF
  if [ "${with_gcc}" != "__SYSTEM__" ]; then
    cat << EOF >> "${BUILDDIR}/setup_gcc"
# needs full path for mpich/openmpi builds, triggers openblas bug
prepend_path PATH "${pkg_install_dir}/bin"
prepend_path LD_LIBRARY_PATH "${pkg_install_dir}/lib"
prepend_path LD_LIBRARY_PATH "${pkg_install_dir}/lib64"
prepend_path LD_RUN_PATH "${pkg_install_dir}/lib"
prepend_path LD_RUN_PATH "${pkg_install_dir}/lib64"
prepend_path LIBRARY_PATH "${pkg_install_dir}/lib"
prepend_path LIBRARY_PATH "${pkg_install_dir}/lib64"
prepend_path CPATH "${pkg_install_dir}/include"
export LD_LIBRARY_PATH="${pkg_install_dir}/lib":\${LD_LIBRARY_PATH}
export LD_LIBRARY_PATH="${pkg_install_dir}/lib64":\${LD_LIBRARY_PATH}
export LD_RUN_PATH="${pkg_install_dir}/lib":\${LD_RUN_PATH}
export LD_RUN_PATH="${pkg_install_dir}/lib64":\${LD_RUN_PATH}
export LIBRARY_PATH="${pkg_install_dir}/lib":\${LIBRARY_PATH}
export LIBRARY_PATH="${pkg_install_dir}/lib64":\${LIBRARY_PATH}
export CPATH="${pkg_install_dir}/include":\${CPATH}
EOF
  fi
  cat << EOF >> "${BUILDDIR}/setup_gcc"
export GCC_CFLAGS="${GCC_CFLAGS}"
export GCC_LDFLAGS="${GCC_LDFLAGS}"
export TSANFLAGS="${TSANFLAGS}"
EOF
  cat "${BUILDDIR}/setup_gcc" >> ${SETUPFILE}
fi

# ----------------------------------------------------------------------
# Suppress reporting of known leaks
# ----------------------------------------------------------------------

# this might need to be adjusted for the versions of the software
# employed
cat << EOF >> ${INSTALLDIR}/lsan.supp
# known leak either related to mpi or scalapack  (e.g. showing randomly for Fist/regtest-7-2/UO2-2x2x2-genpot_units.inp)
leak:__cp_fm_types_MOD_cp_fm_write_unformatted
# leak related to mpi or scalapack  triggers sometimes for regtest-kp-2/cc2.inp
leak:Cblacs_gridmap
leak:blacs_gridmap_
# leak due to compiler bug triggered by combination of OOP and ALLOCATABLE
leak:__dbcsr_tensor_types_MOD___copy_dbcsr_tensor_types_Dbcsr_tas_dist_t
leak:__dbcsr_tensor_types_MOD___copy_dbcsr_tensor_types_Dbcsr_tas_blk_size_t
EOF
cat << EOF >> ${INSTALLDIR}/tsan.supp
# tsan bugs likely related to gcc
# PR66756
deadlock:_gfortran_st_open
mutex:_gfortran_st_open
# bugs related to removing/filtering blocks in DBCSR.. to be fixed
race:__dbcsr_block_access_MOD_dbcsr_remove_block
race:__dbcsr_operations_MOD_dbcsr_filter_anytype
race:__dbcsr_transformations_MOD_dbcsr_make_untransposed_blocks
EOF

# need to also link to the .supp file in setup file
cat << EOF >> ${SETUPFILE}
export LSAN_OPTIONS=suppressions=${INSTALLDIR}/lsan.supp
export TSAN_OPTIONS=suppressions=${INSTALLDIR}/tsan.supp
EOF

load "${BUILDDIR}/setup_gcc"
write_toolchain_env "${INSTALLDIR}"

cd "${ROOTDIR}"
report_timing "gcc"
