From 738303ba43dc29b82c9877acaa587ed1d55ce251 Mon Sep 17 00:00:00 2001
From: Pavel Belevich <pbelevich@fb.com>
Date: Wed, 4 Sep 2019 13:38:08 -0700
Subject: [PATCH] Add set(CMAKE_SHARED_LINKER_FLAGS_RELEASE
 "-Wl,--no-as-needed") to CMakeLists.txt (#25445)

Summary:
This is a fix for a rare build issue on Ubuntu:
`symbol lookup error: miniconda3/envs/pytorch-py3.7/lib/libmkl_intel_lp64.so: undefined symbol: mkl_blas_dsyrk`
https://software.intel.com/en-us/articles/symbol-lookup-error-when-linking-intel-mkl-with-gcc-on-ubuntu
Pull Request resolved: https://github.com/pytorch/pytorch/pull/25445

Differential Revision: D17151458

Pulled By: pbelevich

fbshipit-source-id: a0f3e86a05ac408b95446560f42fc16fbff2d7af
---
 CMakeLists.txt | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index d6faab67f29..34ed1c6206d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -191,6 +191,13 @@ cmake_dependent_option(
 
 set(ONNX_NAMESPACE "onnx_torch" CACHE STRING "A namespace for ONNX; needed to build with other frameworks that share ONNX.")
 
+# This is a fix for a rare build issue on Ubuntu:
+# symbol lookup error: miniconda3/envs/pytorch-py3.7/lib/libmkl_intel_lp64.so: undefined symbol: mkl_blas_dsyrk
+# https://software.intel.com/en-us/articles/symbol-lookup-error-when-linking-intel-mkl-with-gcc-on-ubuntu
+if(LINUX)
+  set(CMAKE_SHARED_LINKER_FLAGS "-Wl,--no-as-needed")
+endif()
+
 if (MSVC)
   foreach(flag_var
       CMAKE_C_FLAGS CMAKE_C_FLAGS_DEBUG CMAKE_C_FLAGS_RELEASE