[cfe-dev] why do i get the "c++11-narrowing" warning only in switch using defines?

[Richard Smith]

On Mon, May 11, 2015 at 2:23 AM, Dennis Luehring <dl.soluz at gmx.net> wrote:

> #define TEST0 0xFFFA0000
> #define TEST1 0xFFFA0001
>
> const int test0 = 0xFFFA0000;
> const int test1 = 0xFFFA0001;
>
> int main(int argc, char** arcv)
> {
>   if(argc == TEST0) // OK
>   {
>     return 1;
>   }
>
>   if(argc == test0) // OK
>   {
>     return 1;
>   }
>
>   switch(argc)
>   {
>     case TEST1: return 2; // ERROR: case value evaluates to 4294574081,
> which cannot be narrowed to type 'int' [-Wc++11-narrowing]
>

The value here is unsigned, and doesn't fit in an int.


>   }
>
>   switch(argc)
>   {
>     case test1: return 2; // OK
>

The value here is signed; the conversion to int happened in the variable
declaration.


>   }
> }
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