Merge branch 'fftw' into 'master'

FFTW3

See merge request Pmodules/buildblocks!3

MPI/fftw/README

@@ -0,0 +1,7 @@
+FFTW
+====
+
+FFTW is highly optimized, but downgrades if run on an older processor. It
+should be built compiled on a system with SSE2 and AVX2 support (e.g. merlin).
+
+This module requires PMODULE_VERSION > 1.0.0 to compile.

MPI/fftw/build

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+#!/usr/bin/env modbuild
+# Needs to be built with SSE2 and AVX2 support, but should run on architectures without this
+
+pbuild::add_to_group 'MPI'
+
+pbuild::set_download_url "http://www.fftw.org/fftw-$V.tar.gz"
+pbuild::set_sha256sum "fftw-3.3.8.tar.gz:6113262f6e92c5bd474f2875fa1b01054c4ad5040f6b0da7c03c98821d9ae303"
+
+pbuild::install_docfiles 'COPYRIGHT' 'COPYING' 'README' 'NEWS'
+
+pbuild::pre_configure() {
+    pbuild::add_configure_args "CC=${MPICC}"
+    pbuild::add_configure_args "CXX=${MPICXX}"
+
+    # Multithreading. Enabling both is fine
+    pbuild::add_configure_args "--enable-threads"
+    pbuild::add_configure_args "--enable-openmp"
+
+    # MPI support
+    pbuild::add_configure_args "--enable-mpi"
+
+    # CPU optimizations
+    pbuild::add_configure_args "--enable-sse2"
+    pbuild::add_configure_args "--enable-avx2"
+}

MPI/fftw/files/variants

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+fftw/3.3.8	unstable	gcc/{7.3.0,8.2.0} mpich/3.2.1 openmpi/3.1.3

MPI/fftw/modulefile

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+#%Module
+
+module-whatis       "Fastest Fourier Transform in the West"
+module-url          "http://www.fftw.org/"
+module-license      "GPL; http://www.fftw.org/doc/License-and-Copyright.html"
+module-maintainer   "Spencer Bliven <spencer.bliven@psi.ch>"
+
+module-help         "
+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).
+"
+
+