Merge pull request #8860 from JuliaLang/sf/openblas_dynamic_arch

Setting OPENBLAS_TARGET_ARCH disables OPENBLAS_DYNAMIC_ARCH by default

Make.inc

@@ -5,9 +5,15 @@
 ##   your local machine, in a file named `Make.user` in this directory
 
 # OPENBLAS build options
+OPENBLAS_TARGET_ARCH=
+
+# If OPENBLAS_TARGET_ARCH is set, we default to disabling OPENBLAS_DYNAMIC_ARCH
+ifneq ($(OPENBLAS_TARGET_ARCH),)
+OPENBLAS_DYNAMIC_ARCH=0
+else
 OPENBLAS_DYNAMIC_ARCH=1
+endif
 OPENBLAS_USE_THREAD=1
-OPENBLAS_TARGET_ARCH=
 
 # Use libraries available on the system instead of building them
 USE_SYSTEM_LLVM=0