Enable warnings for MSVS

tests/Make-check-cl.bat

@@ -35,7 +35,7 @@ DEL *.log *.dat
 
 REM List the expected failure (compiler internal error)
 set "expectedFailure1=test-msnapshot.c"
-set "expectedFailure2=test-mtuple.c"
+set "expectedFailure2=test-none.c"
 
 echo "Compiler full version:"
 cl /Bv
@@ -52,7 +52,7 @@ for %%f in (test-*.c) do (
     REM /Zc:preprocessor is mandatory to have a compliant preprocessor
     REM /Zc:__cplusplus is needed to report the real value of __cplusplus, so that M*LIB uses the C++ atomic, and not its emulation.
     echo Compiling %%f
-    cl.exe /I.. /O2 /std:c++14 /Zc:__cplusplus /Zc:preprocessor test.cpp > %%f.log 2>&1 
+    cl.exe /I.. /O2 /W3 /std:c++14 /Zc:__cplusplus /Zc:preprocessor test.cpp > %%f.log 2>&1 
     if ERRORLEVEL 1 ( 
         echo *** BUILD ERROR for %%f *** >> %%f.log
         type %%f.log