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77ed8972fa
It is actually useful to warn in such cases, thanks to Dmitri for pushing on this and making us see the light! Related to rdar://15925483 and rdar://15922612. The latter radar is where the usefulness of the warning is most clear. llvm-svn: 201165
15 lines
725 B
C
15 lines
725 B
C
// RUN: %clang_cc1 %s -verify
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#define SOME_ADDR (unsigned long long)0
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// PR10837: Warn if a non-pointer-typed expression is folded to a null pointer
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int *p = 0;
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int *q = '\0'; // expected-warning{{expression which evaluates to zero treated as a null pointer constant}}
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int *r = (1 - 1); // expected-warning{{expression which evaluates to zero treated as a null pointer constant}}
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void f() {
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p = 0;
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q = '\0'; // expected-warning{{expression which evaluates to zero treated as a null pointer constant}}
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r = 1 - 1; // expected-warning{{expression which evaluates to zero treated as a null pointer constant}}
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p = SOME_ADDR; // expected-warning{{expression which evaluates to zero treated as a null pointer constant}}
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}
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