From d36885590dffef10e061f64d09897c8af46d274c Mon Sep 17 00:00:00 2001
From: Jinzhe Zeng <jinzhe.zeng@rutgers.edu>
Date: Mon, 19 Apr 2021 20:09:23 -0400
Subject: [PATCH] only enable link what you use on GNU compilers

Clang doesn't support this flag, cause an error on osx:

> ld: unknown option: --no-as-needed

This commit should be cherry-picked to `r1.2` branch.
---
 source/CMakeLists.txt | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/source/CMakeLists.txt b/source/CMakeLists.txt
index 84c3d326da..9bb4486de6 100644
--- a/source/CMakeLists.txt
+++ b/source/CMakeLists.txt
@@ -1,6 +1,8 @@
 cmake_minimum_required(VERSION 3.7)
 project(DeePMD)
-set(CMAKE_LINK_WHAT_YOU_USE TRUE)
+if (CMAKE_COMPILER_IS_GNU)
+  set(CMAKE_LINK_WHAT_YOU_USE TRUE)
+endif ()
 
 # build cpp or python interfaces
 if (NOT DEFINED BUILD_CPP_IF)