# Build recipe for fftw.
#
# Copyright (c) 2021 Matias Fonzo, <selk@dragora.org>.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#    http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

# Exit immediately on any error
set -e

program=fftw
version=3.3.10
release=1

# Define a category for the output of the package name
pkgcategory=libs

description="
A fast C library for computing the discrete Fourier transform.

FFTW is a C subroutine library for computing the discrete Fourier
transform (DFT) in one or more dimensions, of arbitrary input size,
and of both real and complex data (as well as of even/odd data, i.e.
the discrete cosine/sine transforms or DCT/DST).
"

homepage=https://fftw.org
license=GPLv2+

tarname=${program}-${version}.tar.gz

# Remote source(s)
fetch=http://www.fftw.org/$tarname

# Source documentation
docs="AUTHORS CONVENTIONS COPYING COPYRIGHT NEWS README* TODO"
docsdir="${docdir}/${program}-${version}"

_configure_argv()
{
    ./configure CPPFLAGS="$QICPPFLAGS" CFLAGS="$QICFLAGS" \
    LDFLAGS="$QILDFLAGS" \
    $configure_args \
    --libdir=/usr/lib${libSuffix} \
    --infodir=$infodir \
    --mandir=$mandir \
    --docdir=$docsdir \
    --enable-static=no \
    --enable-shared=yes \
    --build="$(gcc -dumpmachine)" "$@"
}

build()
{
    unpack "${tardir}/$tarname"

    cd "$srcdir"

    # Set sane permissions
    chmod -R u+w,go-w,a+rX-s .

    # Set custom build options per architecture
    case $arch in
    i?86 | amd64 | x32 )
        _build_simd="--enable-sse2 --enable-avx"
        ;;
    esac

    # Build with double precision arithmetic support

    _configure_argv $_build_simd
    make -j${jobs} V=1
    make -j${jobs} DESTDIR="$destdir" install-strip

    # Build with single precision support

    make clean
    _configure_argv $_build_simd --enable-threads --enable-float
    make -j${jobs} V=1
    make -j${jobs} DESTDIR="$destdir" install-strip

    unset -v _build_simd

    # Build with long double support

    make clean
    _configure_argv --enable-threads --enable-long-double
    make -j${jobs} V=1
    make -j${jobs} DESTDIR="$destdir" install-strip

    # Build with quad precision support

    make clean
    _configure_argv --enable-threads --enable-quad-precision
    make -j${jobs} V=1
    make -j${jobs} DESTDIR="$destdir" install-strip

    unset -f _configure_argv

    # Compress info documents deleting index file for the package
    if test -d "${destdir}/$infodir"
    then
        rm -f "${destdir}/${infodir}/dir"
        lzip -9 "${destdir}/${infodir}"/*
    fi

    # Compress manual pages
    if [ -d "${destdir}/$mandir" ] ; then
	(
            cd "${destdir}/$mandir"
	    find . -type f -exec lzip -9 {} +
	    find . -type l | while read -r file
	    do
		ln -sf "$(readlink -- "$file").lz" "${file}.lz"
		rm -- "$file"
	    done
	)
    fi

    # Copy documentation
    mkdir -p "${destdir}/$docsdir"
    cp -p $docs "${destdir}/$docsdir"
}

