[WIP] MKL repos download for mac and windows + update to MKL(-DNN) 0.12 (#17396)

* Fix MKL build on MacOS

* Fix invalid return type, user_memory_->set_data_handle(buf) returns void.

* Fix type mismatch

* Implement downloading and linking of MKL repo on mac and windows

* Rework the way MKL libs are binded to avoid warnings and simplify code

* Switch to matching version of MKL-DNN

* Add mirror links

* Add renamed license file

* Add -fopenmp flag for linux mkl build as Slice op kernel is optimized using OpenMP

* Use clean_dep in the entire file for consistency

* Fix build. Constants are declrared as static in header outside the class scope now

* Reworked fix for `-openmp` flag using the suggestion from @gunan
Original version here https://github.com/gunan/tensorflow/commit/b4d39c5226e8bbafe084b1dfc35f4644f2d906c2

1 files changed, 12 insertions, 0 deletions

diff --git a/third_party/mkl/build_defs.bzl b/third_party/mkl/build_defs.bzl
index 8b73ddabdd..53e02769da 100644
--- a/third_party/mkl/build_defs.bzl
+++ b/third_party/mkl/build_defs.bzl
@@ -24,6 +24,18 @@ def if_mkl(if_true, if_false = []):
         "//conditions:default": if_false
     })
 
+def if_mkl_lnx_x64(if_true, if_false = []):
+    """Shorthand for select()'ing on whether we're building with MKL.
+
+    Returns a select statement which evaluates to if_true if we're building
+    with MKL enabled.  Otherwise, the select statement evaluates to if_false.
+
+    """
+    return select({
+        str(Label("//third_party/mkl:using_mkl_lnx_x64")): if_true,
+        "//conditions:default": if_false
+    })
+
 
 def _enable_local_mkl(repository_ctx):
   return _TF_MKL_ROOT in repository_ctx.os.environ