[SYCL] Clarify DPC++ default C++ standard version in the documentation (#1556)

Signed-off-by: Dmitry Vodopyanov <[email protected]>

Author: dm-vodopyanov

sycl/CMakeLists.txt

@@ -2,7 +2,7 @@ cmake_minimum_required(VERSION 3.2)
 
 project(sycl-solution)
 # Requirements
-set(CMAKE_CXX_STANDARD 11)
+set(CMAKE_CXX_STANDARD 14)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 set(CMAKE_CXX_EXTENSIONS OFF)
 option(SYCL_ENABLE_WERROR "Treat all warnings as errors in SYCL project" OFF)

sycl/doc/FAQ.md

@@ -19,7 +19,7 @@ set up a proper environment. To learn more about using the DPC++ compiler,
 please refer to [Users Manual](UsersManual.md). If using a special compiler
 is not an option for you and/or you would like to experiment without offloading
 code to non-host devices, you can exploit SYCL's host device feature. This
-gives you the ability to use any C++11 compiler. You will need to link your
+gives you the ability to use any C++14 compiler. You will need to link your
 application with the DPC++ Runtime library and provide a path to the SYCL
 headers directory. Please, refer to your compiler manual to learn about
 specific build options.

sycl/doc/GetStartedGuide.md

@@ -514,7 +514,8 @@ class CUDASelector : public cl::sycl::device_selector {
 
 ## C++ standard
 
-- Minimal supported C++ standard is C++11 on Linux and C++14 on Windows.
+- DPC++ runtime is built as C++14 library.
+- DPC++ compiler is building apps as C++14 apps by default.
 
 ## Known Issues and Limitations