Merge pull request #151 from cancan101/patch-1

MRG: library_builders for fftw

Recipe for FFTW build.

library_builders.sh

@@ -39,6 +39,7 @@ LIBTOOL_VERSION=${LIBTOOL_VERSION:-2.4.6}
 RAGEL_VERSION=${RAGEL_VERSION:-6.10}
 FLEX_VERSION=${FLEX_VERSION:-2.6.4}
 BISON_VERSION=${BISON_VERSION:-3.0.4}
+FFTW_VERSION=${FFTW_VERSION:-3.3.7}
 OPENSSL_ROOT=openssl-1.0.2l
 # Hash from https://www.openssl.org/source/openssl-1.0.2?.tar.gz.sha256
 OPENSSL_HASH=ce07195b659e75f4e1db43552860070061f156a98bb37b672b101ba6e3ddf30c
@@ -381,3 +382,55 @@ function build_flex {
     build_simple flex $FLEX_VERSION \
         https://github.com/westes/flex/releases/download/v$FLEX_VERSION
 }
+
+function build_fftw_case {
+    local configure_args=${@:0}
+
+    build_simple fftw $FFTW_VERSION \
+        http://www.fftw.org/ tar.gz \
+        --with-pic --enable-shared --enable-threads --disable-fortran \
+        $configure_args
+    # eval cd fftw-$FFTW_VERSION/tests && make check-local && cd -
+}
+
+function build_fftw {
+    echo 'Building fftw'
+
+    # Save off current CFLAGS
+    local old_cflags=$CFLAGS
+
+    # Taken from: https://github.com/conda-forge/fftw-feedstock/blob/master/recipe/build.sh
+    export CFLAGS="-O3 -fomit-frame-pointer -fstrict-aliasing -ffast-math"
+
+    # single
+    echo 'Building fftw: single'
+    build_fftw_case --enable-float --enable-sse --enable-sse2 --enable-avx
+
+    # Clear stamp file which prevents subsequent builds
+    rm fftw-stamp
+
+    # double
+    echo 'Building fftw: double'
+    build_fftw_case --enable-sse2 --enable-avx
+
+    # Clear stamp file which prevents subsequent builds
+    rm fftw-stamp
+
+    # long double (SSE2 and AVX not supported)
+    echo 'Building fftw: long double'
+    build_fftw_case --enable-long-double
+
+    # Taken from: https://github.com/conda-forge/pyfftw-feedstock/blob/master/recipe/build.sh
+    export C_INCLUDE_PATH=$BUILD_PREFIX/include  # required as fftw3.h installed here
+
+    # define STATIC_FFTW_DIR so the patched setup.py will statically link FFTW
+    export STATIC_FFTW_DIR=$BUILD_PREFIX/lib
+
+    # TODO: These can be made into asserts per:
+    # https://github.com/conda-forge/fftw-feedstock/blob/8eaa8a1c63e7fcb97c63c1ee8e33c62ef3afa9c7/recipe/meta.yaml#L29-L52
+    ls -l $C_INCLUDE_PATH/fftw3*
+    ls -l $STATIC_FFTW_DIR/libfftw3*
+
+    # restore CFLAGS
+    export CFLAGS=$old_cflags
+}