# Maintainer: David Runge <dvzrv@archlinux.org>
# Contributor: Ronald van Haren <ronald.archlinux.org>
# Contributor: David Runge <dvzrv@archlinux.org>
# Contributor: damir <damir@archlinux.org>

# ALARM: Kevin Mihelich <kevin@archlinuxarm.org>
#  - removed -malign-double from CFLAGS
#  - removed --enable-sse, --enable-avx from single precision
#  - removed --enable-sse2, --enable-avx from double precision
#  - removed quad precision variant from _build_types array

pkgname=fftw
pkgver=3.3.10
pkgrel=5
pkgdesc="A library for computing the discrete Fourier transform (DFT)"
arch=(x86_64)
url="http://www.fftw.org/"
license=(GPL2)
depends=(
  bash
  gcc-libs
  glibc
  openmpi
)
makedepends=(
  cmake
  gcc-fortran
)
provides=(
  libfftw3q_threads.so
  libfftw3q_omp.so
  libfftw3q.so
  libfftw3l_threads.so
  libfftw3l_omp.so
  libfftw3l_mpi.so
  libfftw3l.so
  libfftw3f_threads.so
  libfftw3f_omp.so
  libfftw3f_mpi.so
  libfftw3f.so
  libfftw3_threads.so
  libfftw3_omp.so
  libfftw3_mpi.so
  libfftw3.so
)
source=(http://www.fftw.org/$pkgname-$pkgver.tar.gz)
sha512sums=('2d34b5ccac7b08740dbdacc6ebe451d8a34cf9d9bfec85a5e776e87adf94abfd803c222412d8e10fbaa4ed46f504aa87180396af1b108666cde4314a55610b40')
b2sums=('3663872bd95a01d2c79af185f53918e1d1a9c91c620082402772c07f25b9b77d4920a78dc686fac6b51aa961b8d62b7e2cef3f3031e096bed40ced80b59b29d5')
_build_types=(single double long-double)

prepare() {
  local _i

  # fix wrong soname in FFTW3LibraryDepends.cmake
  sed -e 's/3.6.9/3.6.10/' -i $pkgname-$pkgver/CMakeLists.txt

  mv -v $pkgname-$pkgver $pkgname-$pkgver-single
  for _i in {1..3}; do
    cp -av $pkgname-$pkgver-single $pkgname-$pkgver-"${_build_types[$_i]}"
  done
}

build() {
  local _name
  local _configure=(
    ./configure
    --prefix=/usr
    --enable-shared
    --enable-threads
    --enable-mpi
    --enable-openmp
  )
  local _configure_single=(
    --enable-single
  )
  local _configure_double=(
  )
  local _configure_long_double=(
    --enable-long-double
  )
  local _configure_quad=(
    --disable-mpi
    --enable-quad-precision
  )
  local _cmake_options=(
    -B build
    -S $pkgname-$pkgver-$_build_types
    -D CMAKE_INSTALL_PREFIX=/usr
    -D CMAKE_BUILD_TYPE=None
    -D ENABLE_OPENMP=ON
    -D ENABLE_THREADS=ON
    -D ENABLE_FLOAT=ON
    -D ENABLE_LONG_DOUBLE=ON
    -D ENABLE_QUAD_PRECISION=ON
    -D ENABLE_SSE=ON
    -D ENABLE_SSE2=ON
    -D ENABLE_AVX=ON
    -D ENABLE_AVX2=ON
  )

  # create missing FFTW3LibraryDepends.cmake
  # https://bugs.archlinux.org/task/67604
  cmake "${_cmake_options[@]}"
  # fix broken IMPORTED_LOCATION: https://github.com/FFTW/fftw3/issues/130#issuecomment-1030280157
  sed -e 's|\(IMPORTED_LOCATION_NONE\).*|\1 "/usr/lib/libfftw3.so.3"|' -i build/FFTW3LibraryDepends.cmake

  export F77='gfortran'
  # use upstream default CFLAGS while keeping our -march/-mtune
  CFLAGS+=" -O3 -fomit-frame-pointer -fstrict-aliasing -ffast-math"

  for _name in "${_build_types[@]}"; do
    (
      cd $pkgname-$pkgver-$_name
      case $_name in
        single)
        "${_configure[@]}" "${_configure_single[@]}"
        ;;
        double)
        "${_configure[@]}" "${_configure_double[@]}"
        ;;
        long-double)
        "${_configure[@]}" "${_configure_long_double[@]}"
        ;;
        quad)
        "${_configure[@]}" "${_configure_quad[@]}"
        ;;
      esac
      # fix overlinking because of libtool
      sed -i -e 's/ -shared / -Wl,-O1,--as-needed\0/g' libtool
    )
  done

  for _name in "${_build_types[@]}"; do
    make -C $pkgname-$pkgver-$_name
  done
}

check() {
  local _name

  for _name in "${_build_types[@]}"; do
    make check-local -C $pkgname-$pkgver-$_name/tests
  done
}

package() {
  local _name

  for _name in "${_build_types[@]}"; do
    make DESTDIR="$pkgdir" install -C $pkgname-$pkgver-$_name
  done
  install -vDm 644 $pkgname-$pkgver-$_build_types/{AUTHORS,ChangeLog,NEWS,README,TODO} -t "$pkgdir/usr/share/doc/$pkgname"
  # install missing FFTW3LibraryDepends.cmake
  install -vDm 644 build/FFTW3LibraryDepends.cmake -t "$pkgdir/usr/lib/cmake/fftw3/"
}