From ca7f1f2fc4a79a0a075ba1055d51d21e0e698654 Mon Sep 17 00:00:00 2001
From: Tim Dickson <dickson.tim@googlemail.com>
Date: Mon, 7 Jan 2019 19:26:31 +0700
Subject: libraries/OpenBLAS: Fix build on VM.

Signed-off-by: Willy Sudiarto Raharjo <willysr@slackbuilds.org>
---
 libraries/OpenBLAS/OpenBLAS.SlackBuild | 17 +++++++++++++++--
 libraries/OpenBLAS/README              |  5 +++++
 2 files changed, 20 insertions(+), 2 deletions(-)

(limited to 'libraries/OpenBLAS')

diff --git a/libraries/OpenBLAS/OpenBLAS.SlackBuild b/libraries/OpenBLAS/OpenBLAS.SlackBuild
index b0773b1259..5025a75415 100644
--- a/libraries/OpenBLAS/OpenBLAS.SlackBuild
+++ b/libraries/OpenBLAS/OpenBLAS.SlackBuild
@@ -17,7 +17,19 @@ if [ -z "$ARCH" ]; then
        *) ARCH=$( uname -m ) ;;
   esac
 fi
-
+EXTRAPARMS=""
+if [ "x`uname -p|grep QEMU|wc -l`" = "x1" ]; then
+  #we are running in a vm with a QEMU cpu. OpenBLAS does not like this
+  EXTRAPARMS="DYNAMIC_ARCH=1"
+  if [ "x$TARGET" = "x" ]; then
+    echo "the cpu is not recognised by OpenBLAS. specify a target cpu"
+    echo "using variable TARGET=targetname"
+    echo "look at TargetList.txt in the source for valid TARGET types."
+    exit 2
+  else
+    EXTRAPARMS=$EXTRAPARMS" TARGET="$TARGET
+  fi
+fi
 CWD=$(pwd)
 TMP=${TMP:-/tmp/SBo}
 PKG=$TMP/package-$PRGNAM
@@ -44,8 +56,9 @@ find -L . \
  \( -perm 666 -o -perm 664 -o -perm 640 -o -perm 600 -o -perm 444 \
   -o -perm 440 -o -perm 400 \) -exec chmod 644 {} \;
 
-make
+make $EXTRAPARMS
 make \
+  $EXTRAPARMS \
   NO_STATIC=1 \
   BUILD_RELAPACK=1 \
   DESTDIR=$PKG \
diff --git a/libraries/OpenBLAS/README b/libraries/OpenBLAS/README
index f1a444a09e..7269fb158c 100644
--- a/libraries/OpenBLAS/README
+++ b/libraries/OpenBLAS/README
@@ -2,3 +2,8 @@ OpenBLAS is an optimized BLAS library based on GotoBLAS2 1.13 BSD version.
 
 Added symbolic link to install a generic blas library that can be used by
 Octave and R.
+OpenBLAS has cpu specific targetted assembly code for speed optimisation.
+If running in a vm with QEMU cpu you need to specify a variable
+TARGET=cpuname to the script where cpuname is one from the list in the
+sourcecode file TargetList.txt
+examples are TARGET=NEHALEM for an Intel i7 or TARGET=ATHLON for AMD Athlon
-- 
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