Merge pull request #11664 from boegel/20201111095657_new_pr_FFTW338

{numlib}[intel/2020b] FFTW v3.3.8

easybuild/easyconfigs/f/FFTW/FFTW-3.3.8-intel-2020b.eb

@@ -0,0 +1,30 @@
+name = 'FFTW'
+version = '3.3.8'
+
+homepage = 'http://www.fftw.org'
+description = """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."""
+
+toolchain = {'name': 'intel', 'version': '2020b'}
+toolchainopts = {'pic': True}
+
+source_urls = [homepage]
+sources = [SOURCELOWER_TAR_GZ]
+patches = ['FFTW-%(version)s_fix-icc-no-gcc.patch']
+checksums = [
+    '6113262f6e92c5bd474f2875fa1b01054c4ad5040f6b0da7c03c98821d9ae303',  # fftw-3.3.8.tar.gz
+    '1b3319b98a2ca4ead68290b3229385c0573e22749a5a2ffb49486a0bbb37dc1e',  # FFTW-3.3.8_fix-icc-no-gcc.patch
+]
+
+# no quad precision, requires GCC v4.6 or higher
+# see also
+# http://www.fftw.org/doc/Extended-and-quadruple-precision-in-Fortran.html
+with_quad_prec = False
+
+# compilation fails on AMD systems when configuring with --enable-avx-128-fma,
+# because Intel compilers do not support FMA4 instructions
+use_fma4 = False
+
+runtest = 'check'
+
+moduleclass = 'numlib'