[fbsync] switch to C++17 following the core library (#7116)

Summary: Co-authored-by: vfdev <[email protected]>

Reviewed By: vmoens

Differential Revision: D43116119

fbshipit-source-id: 7dc832890d5cdaf0bb94c04f1800c74abb303050

Author: NicolasHug

CMakeLists.txt

@@ -1,6 +1,6 @@
-cmake_minimum_required(VERSION 3.12)
+cmake_minimum_required(VERSION 3.18)
 project(torchvision)
-set(CMAKE_CXX_STANDARD 14)
+set(CMAKE_CXX_STANDARD 17)
 file(STRINGS version.txt TORCHVISION_VERSION)
 
 option(WITH_CUDA "Enable CUDA support" OFF)
@@ -13,11 +13,6 @@ if(WITH_CUDA)
   add_definitions(-D__CUDA_NO_HALF_OPERATORS__)
   add_definitions(-DWITH_CUDA)
   set(CMAKE_CUDA_FLAGS "${CMAKE_CUDA_FLAGS} --expt-relaxed-constexpr")
-  # CUDA-11.x can not be compiled using C++14 standard on Windows
-  string(REGEX MATCH "^[0-9]+" CUDA_MAJOR ${CMAKE_CUDA_COMPILER_VERSION})
-  if(${CUDA_MAJOR} GREATER 10 AND MSVC)
-    set(CMAKE_CXX_STANDARD 17)
-  endif()
 endif()
 
 find_package(Torch REQUIRED)