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017675fff1
The attribute is now allowed on an assortment of declarations, to suppress warnings related to declarations themselves, or all warnings in the lexical scope of the declaration. I don't necessarily see a reason to have a list at all, but it does look as if some of those more niche items aren't properly supported by the compiler itself so let's maintain a short safe list for now. The initial implementation raised a question whether the attribute should apply to lexical declaration context vs. "actual" declaration context. I'm using "lexical" here because it results in less warnings suppressed, which is the conservative behavior: we can always expand it later if we think this is wrong, without breaking any existing code. I also think that this is the correct behavior that we will probably never want to change, given that the user typically desires to keep the suppressions as localized as possible.
46 lines
1.2 KiB
Objective-C
46 lines
1.2 KiB
Objective-C
// RUN: %clang_cc1 -fsyntax-only -fblocks %s -verify
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#define SUPPRESS1 __attribute__((suppress))
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#define SUPPRESS2(...) __attribute__((suppress(__VA_ARGS__)))
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SUPPRESS1 int global = 42;
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SUPPRESS1 void foo() {
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SUPPRESS1 int *p; // no-warning
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SUPPRESS1 int a = 0; // no-warning
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SUPPRESS2()
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int b = 1; // no-warning
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SUPPRESS2("a")
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int c = a + b; // no-warning
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SUPPRESS2("a", "b") { b = c - a; } // no-warning
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SUPPRESS2("a", "b")
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if (b == 10)
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a += 4; // no-warning
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SUPPRESS1 while (1) {} // no-warning
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SUPPRESS1 switch (a) { // no-warning
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default:
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c -= 10;
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}
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// GNU-style attributes and C++11 attributes apply to different things when
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// written like this. GNU attribute gets attached to the declaration, while
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// C++11 attribute ends up on the type.
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int SUPPRESS2("r") z; // no-warning
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SUPPRESS2(foo) // no-warning
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float f;
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// expected-error@-2 {{expected string literal as argument of 'suppress' attribute}}
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}
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union SUPPRESS2("type.1") U { // no-warning
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int i;
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float f;
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};
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SUPPRESS1 @interface Test { // no-warning
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}
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@property SUPPRESS2("prop") int *prop; // no-warning
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- (void)bar:(int)x SUPPRESS1; // no-warning
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@end
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