[cfe-commits] [PATCH] PR11778 Switch promotions working properly

[Ahmed Charles]

This makes switch statements like the following compile:

int f1(char c) { switch(c) { case 256: case 0: return 1; } return 0; }
int f2(unsigned char c) { switch(c) { case 256: case 0: return 1; } return 0; }
int f3(char c) { switch(c) { case 255 ... 256: case 0: return 1; } return 0; }
int f3(unsigned char c) { switch(c) { case 255 ... 256: case 0: return 1; } return 0; }

The condition in the switch statement undergoes integer promotions, therefore the above should compile, but doesn't. This also adds a warning which tells the user when a case can't be reached.
 		 	   		  
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