#!/bin/sh

# Slackware build script for fftw
# Written by Kyle Guinn <elyk03@gmail.com>

PRGNAM="fftw"
VERSION=${VERSION:-"3.2.1"}
ARCH=${ARCH:-"i486"}
BUILD=${BUILD:-"1"}
TAG=${TAG:-"_SBo"}

CWD=$(pwd)
TMP=${TMP:-"/tmp/SBo"}
PKG="$TMP/package-$PRGNAM-$VERSION"
OUTPUT=${OUTPUT:-"/tmp"}

DOCS="AUTHORS CONVENTIONS COPY* ChangeLog INSTALL NEWS README* TODO doc/html"

# According to doc/fftw3.pdf the configure script should choose the best
# value for $CFLAGS.  These variables must be unset so that the configure
# script will decide.
unset CFLAGS
unset CXXFLAGS
unset FFLAGS
PKGARCH="custom"

if [ "$ARCH" = "i486" ]; then
  LIBDIRSUFFIX=""
elif [ "$ARCH" = "i686" ]; then
  LIBDIRSUFFIX=""
elif [ "$ARCH" = "x86_64" ]; then
  LIBDIRSUFFIX="64"
fi


set -e

rm -rf $PKG
mkdir -p $TMP $PKG $OUTPUT
cd $TMP
rm -rf $PRGNAM-$VERSION
tar xvf $CWD/$PRGNAM-$VERSION.tar.gz
cd $PRGNAM-$VERSION
chown -R root:root .
chmod -R u+w,go+r-w,a-st .

# By default this script leaves out these machine-dependent optimizations.
# If your machine supports these, feel free to add them to the configure
# options.  Note that fftw may refuse to compile by doing so -- watch for
# error messages about the precision not matching.  See the link below.
#
# --enable-fma      enable optimizations for machines with fused multiply-add
# --enable-k7       enable AMD K7 optimizations, including 3dNow!
# --enable-sse      enable SSE optimizations (Pentium III+)
# --enable-sse2     enable SSE2 optimizations (Pentium IV+)
# --enable-altivec  enable Altivec optimizations (PowerPC G4+)
# --enable-portable-binary
#                   disable compiler optimizations that would produce
#                   unportable binaries
#
# Compiling with the default options creates a double-precision library
# named libfftw3.  --enable-float or --enable-single builds a single
# precision library (libfftw3f), and --enable-long-double builds a
# long-double precision library (libfftw3l).  This script builds all three
# libraries since they can coexist on the same machine.
#
# You may be able to --enable one of the SIMD options when compiling for
# one precision, but not for another.  Check this page for details:
# http://www.fftw.org/fftw3_doc/Installation-on-Unix.html

# compile libfftw3
./configure \
	--prefix=/usr \
        --libdir=/usr/lib${LIBDIRSUFFIX} \
	--sysconfdir=/etc \
	--localstatedir=/var \
	--mandir=/usr/man \
	--infodir=/usr/info \
	--docdir=/usr/doc/fftw-$VERSION \
	--enable-shared \
	--disable-static \
	--enable-threads
make
make install-strip DESTDIR=$PKG

# compile libfftw3f
./configure \
	--prefix=/usr \
        --libdir=/usr/lib${LIBDIRSUFFIX} \
	--sysconfdir=/etc \
	--localstatedir=/var \
	--mandir=/usr/man \
	--infodir=/usr/info \
	--docdir=/usr/doc/fftw-$VERSION \
	--enable-shared \
	--disable-static \
	--enable-threads \
	--enable-float
make
make install-strip DESTDIR=$PKG

# compile libfftw3l
./configure \
	--prefix=/usr \
        --libdir=/usr/lib${LIBDIRSUFFIX} \
	--sysconfdir=/etc \
	--localstatedir=/var \
	--mandir=/usr/man \
	--infodir=/usr/info \
	--docdir=/usr/doc/fftw-$VERSION \
	--enable-shared \
	--disable-static \
	--enable-threads \
	--enable-long-double
make
make install-strip DESTDIR=$PKG

( cd $PKG/usr/man
	find . -type f -exec gzip -9 {} \;
	for i in $(find . -type l); do \
		ln -s $(readlink $i).gz $i.gz; \
		rm $i; \
	done
)

rm -f $PKG/usr/info/dir
gzip -9 $PKG/usr/info/*

mkdir -p $PKG/usr/doc/$PRGNAM-$VERSION
cp -a $DOCS $PKG/usr/doc/$PRGNAM-$VERSION
cat $CWD/$PRGNAM.SlackBuild > $PKG/usr/doc/$PRGNAM-$VERSION/$PRGNAM.SlackBuild

mkdir -p $PKG/install
cat $CWD/slack-desc > $PKG/install/slack-desc

cd $PKG
/sbin/makepkg -l y -c n $OUTPUT/$PRGNAM-$VERSION-$PKGARCH-$BUILD$TAG.tgz