Update minimum C++ version to 17 (#2031)

Co-authored-by: Nayef Ahmed <[email protected]>

Author: Nayef211

CMakeLists.txt

@@ -24,10 +24,10 @@ string(FIND "${CMAKE_CXX_FLAGS}" "-std=c++" env_cxx_standard)
 if(env_cxx_standard GREATER -1)
   message(
       WARNING "C++ standard version definition detected in environment variable."
-      "PyTorch requires -std=c++14. Please remove -std=c++ settings in your environment.")
+      "PyTorch requires -std=c++17. Please remove -std=c++ settings in your environment.")
 endif()
 
-set(CMAKE_CXX_STANDARD 14)
+set(CMAKE_CXX_STANDARD 17)
 set(CMAKE_C_STANDARD 11)
 
 set(CMAKE_EXPORT_COMPILE_COMMANDS ON)