From 36d981471a7a47a68ef0a5298eb224c9fead859f Mon Sep 17 00:00:00 2001
From: Nai-Yuan Chiang <chiang7@llnl.gov>
Date: Mon, 10 Feb 2025 12:39:26 -0800
Subject: [PATCH] use C++17 (#703)

* create branch

* fix
---
 CMakeLists.txt | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3b10c505..1c061130 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,7 +1,12 @@
 cmake_minimum_required (VERSION 3.18)
 
-set(CMAKE_CXX_STANDARD 14)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
+
+if(NOT DEFINED CMAKE_CXX_STANDARD)
+  set(CMAKE_CXX_STANDARD 17)
+endif()
+
+
 set(CMAKE_POSITION_INDEPENDENT_CODE ON)
 set(CMAKE_INSTALL_RPATH_USE_LINK_PATH TRUE)
 set(CMAKE_CUDA_SEPARABLE_COMPILATION ON)
@@ -128,7 +133,7 @@ list(APPEND CMAKE_MODULE_PATH ${PROJECT_SOURCE_DIR}/cmake)
 
 target_compile_features(hiop_options
   INTERFACE
-  cxx_std_14
+  cxx_std_17
   cxx_alignas
   cxx_alignof
   cxx_attributes
@@ -238,7 +243,7 @@ if(HIOP_USE_GPU)
     check_language(CUDA)
 
     if(NOT DEFINED CMAKE_CUDA_STANDARD)
-      set(CMAKE_CUDA_STANDARD 14)
+      set(CMAKE_CUDA_STANDARD 17)
       set(CMAKE_CUDA_STANDARD_REQUIRED ON)
     endif()