-fsanitize=shift compile error

Mateusz Tabaka tab.debugteam@gmail.com
Mon Sep 26 23:43:00 GMT 2016


Hi,

I'm trying to compile this file:
int main()
{
         int a = 0;
         switch (a)
         {
         case (4 << 29):
                 break;
         }
         return 0;
}

and I get this error:
./host-x86_64-pc-linux-gnu/gcc/cc1 test.c -quiet -fsanitize=shift
test.c: In function ‘main’:
test.c:6:2: error: case label does not reduce to an integer constant
   case (4 << 29):
   ^~~~

If I remove "-fsanitize=shift" (or change the expression to be less than 
2^31) I'm able to compile above code without issues.
It is expected behavior or a known bug?

Thanks.



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