From 24fe5bc1876f17b84676ad0c0c029b199c8d7c09 Mon Sep 17 00:00:00 2001
From: Christoph Junghans <junghans@lanl.gov>
Date: Tue, 28 Apr 2020 06:03:34 -0600
Subject: [PATCH] cmake: reenable CMAKE_TUNE_FLAGS check

---
 cmake/CMakeLists.txt | 22 +++++++++++-----------
 1 file changed, 11 insertions(+), 11 deletions(-)

diff --git a/cmake/CMakeLists.txt b/cmake/CMakeLists.txt
index 0e408ae25b..d9c82678eb 100644
--- a/cmake/CMakeLists.txt
+++ b/cmake/CMakeLists.txt
@@ -326,17 +326,17 @@ foreach(PKG_WITH_INCL KSPACE PYTHON VORONOI USER-COLVARS USER-MOLFILE USER-NETCD
 endforeach()
 
 set(CMAKE_TUNE_FLAGS "${CMAKE_TUNE_DEFAULT}" CACHE STRING "Compiler specific optimization or instrumentation")
-# this is broken for many flags and compilers
-#separate_arguments(CMAKE_TUNE_FLAGS)
-#include(CheckCXXCompilerFlag)
-#foreach(_FLAG ${CMAKE_TUNE_FLAGS})
-#  check_cxx_compiler_flag("${_FLAG}" COMPILER_SUPPORTS${_FLAG})
-#  if(COMPILER_SUPPORTS${_FLAG})
-#    target_compile_options(lammps PRIVATE ${_FLAG})
-#  else()
-#    message(WARNING "${_FLAG} found in CMAKE_TUNE_FLAGS, but not supported by the compiler, skipping")
-#  endif()
-#endforeach()
+separate_arguments(CMAKE_TUNE_FLAGS)
+include(CheckCXXCompilerFlag)
+foreach(_FLAG ${CMAKE_TUNE_FLAGS})
+  string(REGEX REPLACE "[=\"]" "" _FLAGX ${_FLAG})
+  check_cxx_compiler_flag("${_FLAG}" COMPILER_SUPPORTS${_FLAGX})
+  if(COMPILER_SUPPORTS${_FLAGX})
+    target_compile_options(lammps PRIVATE ${_FLAG})
+  else()
+    message(WARNING "${_FLAG} found in CMAKE_TUNE_FLAGS, but not supported by the compiler, skipping")
+  endif()
+endforeach()
 ########################################################################
 # Basic system tests (standard libraries, headers, functions, types)   #
 ########################################################################