From 7bf18656564853d435fb679c249e5be81c34c780 Mon Sep 17 00:00:00 2001
From: Martin Kroeker <martin@ruby.chemie.uni-freiburg.de>
Date: Wed, 29 Apr 2020 14:42:35 +0200
Subject: [PATCH] make building the bfloat16 functions conditional on
 BUILD_HALF

---
 CMakeLists.txt  | 7 +++++--
 Makefile.rule   | 3 +++
 Makefile.system | 1 +
 3 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index c2b9ae7ad..70760d64d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -86,10 +86,13 @@ if (NOT NO_LAPACK)
   list(APPEND SUBDIRS lapack)
 endif ()
 
+if (NOT DEFINED BUILD_HALF)
+ set (BUILD_HALF false)
+endif ()
 # set which float types we want to build for
 if (NOT DEFINED BUILD_SINGLE AND NOT DEFINED BUILD_DOUBLE AND NOT DEFINED BUILD_COMPLEX AND NOT DEFINED BUILD_COMPLEX16)
   # if none are defined, build for all
-  set(BUILD_HALF true)
+#  set(BUILD_HALF true)
   set(BUILD_SINGLE true)
   set(BUILD_DOUBLE true)
   set(BUILD_COMPLEX true)
@@ -121,7 +124,7 @@ if (BUILD_COMPLEX16)
   list(APPEND FLOAT_TYPES "ZCOMPLEX") # defines COMPLEX and DOUBLE
 endif ()
 
-if (BUILD_SINGLE OR BUILD_HALF)
+if (BUILD_HALF)
   message(STATUS "Building Half Precision")
   list(APPEND FLOAT_TYPES "HALF") # defines nothing
 endif ()
diff --git a/Makefile.rule b/Makefile.rule
index 724a60ec4..8549e6394 100644
--- a/Makefile.rule
+++ b/Makefile.rule
@@ -273,6 +273,9 @@ COMMON_PROF = -pg
 #
 # CPP_THREAD_SAFETY_TEST = 1
 
+
+# If you want to enable the experimental BFLOAT16 support
+# BUILD_HALF = 1
 #
 #  End of user configuration
 #
diff --git a/Makefile.system b/Makefile.system
index ce071133d..e68fc9d28 100644
--- a/Makefile.system
+++ b/Makefile.system
@@ -1395,6 +1395,7 @@ export KERNELDIR
 export FUNCTION_PROFILE
 export TARGET_CORE
 export NO_AVX512
+export BUILD_HALF
 
 export SHGEMM_UNROLL_M
 export SHGEMM_UNROLL_N