breaking: drop C++ 11

Fix deepmodeling#4060.
njzjz · Aug 20, 2024 · 4e73831 · 4e73831
1 parent d77c075
commit 4e73831
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diff --git 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
@@ -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()