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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.
65 lines
2.0 KiB
C++
65 lines
2.0 KiB
C++
// RUN: %clang_cc1 -std=c++11 -fsyntax-only %s -verify
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[[gsl::suppress("globally")]];
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namespace N {
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[[gsl::suppress("in-a-namespace")]];
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}
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[[gsl::suppress("readability-identifier-naming")]] void f_() {
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int *p;
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[[gsl::suppress("type", "bounds")]] {
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p = reinterpret_cast<int *>(7);
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}
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[[gsl::suppress]] int x; // expected-error {{'suppress' attribute takes at least 1 argument}}
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[[gsl::suppress()]] int y; // expected-error {{'suppress' attribute takes at least 1 argument}}
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int [[gsl::suppress("r")]] z; // expected-error {{'suppress' attribute cannot be applied to types}}
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[[gsl::suppress(f_)]] float f; // expected-error {{expected string literal as argument of 'suppress' attribute}}
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}
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union [[gsl::suppress("type.1")]] U {
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int i;
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float f;
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};
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// This doesn't really suppress anything but why not?
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[[clang::suppress]];
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namespace N {
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[[clang::suppress("in-a-namespace")]];
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} // namespace N
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[[clang::suppress]] int global = 42;
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[[clang::suppress]] void foo() {
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[[clang::suppress]] int *p;
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[[clang::suppress]] int a = 0; // no-warning
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[[clang::suppress()]] int b = 1; // no-warning
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[[clang::suppress("a")]] int c = a + b; // no-warning
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[[clang::suppress("a", "b")]] b = c - a; // no-warning
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[[clang::suppress("a", "b")]] if (b == 10) a += 4; // no-warning
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[[clang::suppress]] while (true) {} // no-warning
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[[clang::suppress]] switch (a) { // no-warning
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default:
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c -= 10;
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}
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int [[clang::suppress("r")]] z;
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// expected-error@-1 {{'suppress' attribute cannot be applied to types}}
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[[clang::suppress(foo)]] float f;
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// expected-error@-1 {{expected string literal as argument of 'suppress' attribute}}
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}
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class [[clang::suppress("type.1")]] V {
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int i;
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float f;
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};
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// FIXME: There's no good reason why we shouldn't support this case.
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// But it doesn't look like clang generally supports such attributes yet.
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class W : [[clang::suppress]] public V { // expected-error{{'suppress' attribute cannot be applied to a base specifier}}
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};
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