[cfe-dev] Clang warning for invalid casting!

[David John via cfe-dev]

I am trying to compile a simple code (see below) with gcc and clang. the
gcc generates a warning indicating an incomparable casting (great!).
However, clang didn't generate any warnings! I have passed the same
arguments for both:

cc -Wall -Wextra tmp3.c
gcc -Wall -Wextra tmp3.c

Should I expect clang to generate error or not? If yes, is there an
additional option needs to be passed to clang compiler to generate a
warning for something that is obviously wrong?

Code:

int main(void)
{
   void *b = (void *)0x12345678;
   int   a = (int)(unsigned long)b;
   int   c = (int)b;
   return a + c;
}


Clang version 3.8
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