#!/bin/sh

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

PRGNAM="fftw"
VERSION=${VERSION:="3.2"}
ARCH=${ARCH:-"custom"}
BUILD=${BUILD:-"1"}
TAG=${TAG:-"_SBo"}

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

DOCS="AUTHORS CONVENTIONS COPYING COPYRIGHT ChangeLog INSTALL NEWS README TODO doc/html"

# According to doc/fftw3.pdf, the configure script should choose the best value
# for $CFLAGS.  We will assume that the script knows what it is doing.
unset CFLAGS
unset CXXFLAGS
unset FFLAGS

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 we will leave 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.
# --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
#
# You can also build fftw using a different precision.  --enable-float may be
# required depending on any SIMD code enabled with the above options.
# --enable-single       compile fftw in single precision
# --enable-float        synonym for --enable-single
# --enable-long-double  compile fftw in long-double precision
#
# Heinz Wiesinger points out that these extra precisions can be compiled 
# as well.  --enable-float will append an 'f' to the library names, while
# --enable-long-double will append an 'l'.  We have to compile three separate
# times instead of once to create all of the files.
#
# Note that the ./configure; make; make install commands below are not inside
# a loop.  You may be able to --enable one of the SIMD options for one
# precision, but not another.  (This should be documented somewhere...)

# compile fftw3
./configure \
	--prefix=/usr \
	--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 fftw3f
./configure \
	--prefix=/usr \
	--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 fftw3l
./configure \
	--prefix=/usr \
	--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/*.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-$VERSION-$ARCH-$BUILD$TAG.tgz