# Description: C subroutine library for computing discrete Fourier transform.
# URL: http://www.fftw.org/
# Maintainer: Danny Rawlins, romster at shortcircuit dot net dot au
# Packager: acrux, acrux at linuxmail dot org
# Depends on: 
# Optional: gcc-fortran

name=fftw
version=3.1.2
release=3
source=(http://www.fftw.org/fftw-$version.tar.gz)

build() {
	cd fftw-$version

	# use -mtune to be processor-specific optimisations without
	# -march as this will give the best speed but wont be portable.
	export CFLAGS="-O3 $(echo $CFLAGS |sed -e 's/-O[s0-3] //')"
	export CXXFLAGS="-O3 $(echo $CXXFLAGS |sed -e 's/-O[s0-3] //')"
	export FFLAGS="-O3 $(echo $FFLAGS |sed -e 's/-O[s0-3] //')"

	local config='
		--prefix=/usr
		--mandir=/usr/man
		--enable-threads
		--enable-type-prefix
		--with-gnu-ld
		--disable-nls'

	# processor-specific optimisations that only worked if
	# not using shared librarys
	if [ -z $FFTW_SHARED ]; then
		if grep '^flags' /proc/cpuinfo |grep sse2 > /dev/null; then
			config="$config --enable-sse2" # intel
		elif grep '^flags' /proc/cpuinfo |grep sse > /dev/null; then
			config="$config --enable-sse" # intel
		elif grep '^flags' /proc/cpuinfo |grep 3dnow > /dev/null; then
			config="$config --enable-k7" # althon
		elif grep '^flags' /proc/cpuinfo |grep altivec > /dev/null; then
			config="$config --enable-altivec" # ppc
		fi
	else
		config="$config --enable-shared"
	fi

	# compiling long double precision library
	./configure \
		$config \
		--enable-long-double

	make
	make DESTDIR=$PKG install
	make clean

	# compiling single precision library
	./configure \
		$config \
		--enable-single

	make
	make DESTDIR=$PKG install
	make clean

	# compiling double precision library
	./configure \
		$config

	make
	make DESTDIR=$PKG install
	rm -r $PKG/usr/share
}