From 4e73831c74de96dbff5ace23aff99db9d8d8b62d Mon Sep 17 00:00:00 2001
From: Jinzhe Zeng <jinzhe.zeng@rutgers.edu>
Date: Tue, 20 Aug 2024 15:45:02 -0400
Subject: [PATCH 1/2] breaking: drop C++ 11

Fix #4060.
---
 doc/install/install-from-source.md | 3 ++-
 source/CMakeLists.txt              | 4 ++++
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/doc/install/install-from-source.md b/doc/install/install-from-source.md
index c0b78004d0..b9eabeccc2 100644
--- a/doc/install/install-from-source.md
+++ b/doc/install/install-from-source.md
@@ -108,7 +108,8 @@ Check the compiler version on your machine
 gcc --version
 ```
 
-The compiler GCC 4.8 or later is supported in the DeePMD-kit.
+By default, DeePMD-kit uses C++ 14, so the compiler needs to support C++ 14 (GCC 5 or later).
+The backend package may use a higher C++ standard version, and thus require a higher compiler version (for example, GCC 7 for C++ 17). 
 
 ::::{tab-set}
 
diff --git a/source/CMakeLists.txt b/source/CMakeLists.txt
index 4f23a85fd5..6e96f4a411 100644
--- a/source/CMakeLists.txt
+++ b/source/CMakeLists.txt
@@ -16,6 +16,10 @@ macro(set_if_higher VARIABLE VALUE)
     set(${VARIABLE} ${VALUE})
   endif()
 endmacro()
+if (NOT DEEPMD_C_ROOT)
+  # we can still allow C++ 11 for programs linked to the C library
+  set_if_higher(CMAKE_CXX_STANDARD 14)
+endif()
 
 if(BUILD_TESTING)
   enable_testing()

From a1a869860012006c26ec4fb9b4368ecb0723c2d7 Mon Sep 17 00:00:00 2001
From: "pre-commit-ci[bot]"
 <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Date: Tue, 20 Aug 2024 19:46:59 +0000
Subject: [PATCH 2/2] [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci
---
 doc/install/install-from-source.md | 2 +-
 source/CMakeLists.txt              | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/doc/install/install-from-source.md b/doc/install/install-from-source.md
index b9eabeccc2..c3ae67a6f1 100644
--- a/doc/install/install-from-source.md
+++ b/doc/install/install-from-source.md
@@ -109,7 +109,7 @@ gcc --version
 ```
 
 By default, DeePMD-kit uses C++ 14, so the compiler needs to support C++ 14 (GCC 5 or later).
-The backend package may use a higher C++ standard version, and thus require a higher compiler version (for example, GCC 7 for C++ 17). 
+The backend package may use a higher C++ standard version, and thus require a higher compiler version (for example, GCC 7 for C++ 17).
 
 ::::{tab-set}
 
diff --git a/source/CMakeLists.txt b/source/CMakeLists.txt
index 6e96f4a411..71b3dca1ea 100644
--- a/source/CMakeLists.txt
+++ b/source/CMakeLists.txt
@@ -16,7 +16,7 @@ macro(set_if_higher VARIABLE VALUE)
     set(${VARIABLE} ${VALUE})
   endif()
 endmacro()
-if (NOT DEEPMD_C_ROOT)
+if(NOT DEEPMD_C_ROOT)
   # we can still allow C++ 11 for programs linked to the C library
   set_if_higher(CMAKE_CXX_STANDARD 14)
 endif()