# Description: C subroutine library for computing discrete Fourier transform.
# URL: https://www.fftw.org/
# Maintainer: Danny Rawlins, crux at romster dot me
# Depends on: gcc-fortran openmpi

name=fftw
version=3.3.10
release=2
source=(https://www.fftw.org/$name-$version.tar.gz)

build() {
	cd $name-$version

	# libtool fails to link with ccache in the path
	[ -e '/usr/bin/ccache' ] && PATH=$(echo ${PATH} | awk -v RS=: -v ORS=: '/ccache/ {next} {print}' | sed 's/:*$//')

	local config="
F77=gfortran
--prefix=/usr
--enable-threads
--enable-shared
--enable-openmp"

	# use upstream default CFLAGS while keeping our -march/-mtune
	CFLAGS+=" -O3 -fomit-frame-pointer -malign-double -fstrict-aliasing -fno-schedule-insns -ffast-math -fPIC -mavx2"

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

	make
	make DESTDIR=$PKG install
	make clean

	# compiling double precision library
	./configure \
		$config \
		--enable-avx \
		--enable-mpi \
		--enable-sse2

	make
	make DESTDIR=$PKG install
	make clean

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

	make
	make DESTDIR=$PKG install
	make clean

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

	make
	make DESTDIR=$PKG install

	# clean up
	rm -r $PKG/usr/share/info
	rm $PKG/usr/lib/*.la
}