Use a binary OpenBLAS (#83)

Fetch OpenBLAS from wheels.scipy.org rather than building it.

_gfortran_utils.sh

+# Stripped-down version of bash utilities for use with gfortran
+
+ARCHIVE_SDIR="${ARCHIVE_SDIR:-archives}"
+
+function _mb_get_gf_lib_for_suf {
+    local suffix=$1
+    local prefix=$2
+    local plat=${3:-$PLAT}
+    local uname=${4:-$(uname)}
+    if [ -z "$prefix" ]; then echo Prefix not defined; exit 1; fi
+    local fname="$prefix-${uname}-${plat}${suffix}.tar.gz"
+    local out_fname="${ARCHIVE_SDIR}/$fname"
+    if [ ! -e "$out_fname" ]; then
+        curl -L "${GF_LIB_URL}/$fname" > $out_fname || (echo "Fetch failed"; exit 1)
+    fi
+    echo "$out_fname"
+}
+
+function _mb_get_gf_lib {
+    # Get library with no suffix
+    _mb_get_gf_lib_for_suf "" $@
+}

library_builders.sh

@@ -2,6 +2,11 @@
 # Defines IS_OSX, fetch_unpack
 MULTIBUILD_DIR=$(dirname "${BASH_SOURCE[0]}")
 source $MULTIBUILD_DIR/common_utils.sh
+source $MULTIBUILD_DIR/_gfortran_utils.sh
+
+# For OpenBLAS
+PLAT="${PLAT:x86_64}"
+GF_LIB_URL="https://3f23b170c54c2533c070-1c8a9b3114517dc5fe17b7c3f8c63a43.ssl.cf2.rackcdn.com"
 
 # Recipes for building some libaries
 OPENBLAS_VERSION="${OPENBLAS_VERSION:-0.2.18}"
@@ -97,15 +102,9 @@ function build_openblas {
         brew install openblas
         brew link --force openblas
     else
-        if [ -d "OpenBLAS" ]; then
-            (cd OpenBLAS && git clean -fxd && git reset --hard)
-        else
-            git clone https://github.com/xianyi/OpenBLAS
-        fi
-        (cd OpenBLAS \
-            && git checkout "v${OPENBLAS_VERSION}" \
-            && make DYNAMIC_ARCH=1 USE_OPENMP=0 NUM_THREADS=64 > /dev/null \
-            && make PREFIX=$BUILD_PREFIX install)
+        local plat=${1:-$PLAT}
+        local tar_path=$(abspath $(_mb_get_gf_lib "openblas-${OPENBLAS_VERSION}" "$plat"))
+        (cd / && tar zxf $tar_path)
     fi
     touch openblas-stamp
 }

tests/test_library_builders.sh

@@ -16,5 +16,6 @@ suppress build_libwebp
 suppress build_szip
 suppress build_swig
 suppress build_github fredrik-johansson/arb 2.11.1
+suppress build_openblas
 
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