CODEWITHSUNDEEP
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DJJ
DJJ

Reputation: 199

Why Clang isn't generating any warnings for an incompatible casting?

I am trying to compile a simple code with gcc and clang. the gcc generates a warning for 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

Am I passing all the necessary options to clang compiler or missing something? The clang documentation isn't a great help!

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

Upvotes: 0

Views: 354

Answers (1)

DJJ
DJJ

Reputation: 199

I have reached out to the clang developers (mailing list). I have got this response:

In C++ mode, Clang errors on the line, same as everyone else. In C mode, however, conversions are typically more permissive. In this case, I suspect Clang should generate this warning as well. It’ll likely require a patch however.

Upvotes: 1

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