[SYCL] Enable all warnings while building SYCL runtime

Signed-off-by: Sergey Kanaev <[email protected]>

Author: Sergey Kanaev

sycl/CMakeLists.txt

@@ -8,14 +8,21 @@ set(CMAKE_CXX_EXTENSIONS OFF)
 set(CMAKE_WINDOWS_EXPORT_ALL_SYMBOLS ON)
 option(SYCL_ENABLE_WERROR "Treat all warnings as errors in SYCL project" OFF)
 
+# enable all warnings by default
+if (MSVC)
+  set(CMAKE_CXX_FLAGS "/W4 ${CMAKE_CXX_FLAGS}")
+else ()
+  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wextra -Wno-deprecated-declarations")
+endif()
+
 if(SYCL_ENABLE_WERROR)
   if(MSVC)
-    set(CMAKE_CXX_FLAGS "/W4 /WX ${CMAKE_CXX_FLAGS}")
+    set(CMAKE_CXX_FLAGS "/WX ${CMAKE_CXX_FLAGS}")
     add_definitions(
       -wd4996 # Suppress 'function': was declared deprecated'
     )
   else()
-    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Werror -Wall -Wextra -Wno-deprecated-declarations")
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Werror")
   endif()
 endif()