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874217f99b
This also ignores and deprecates the `-fdouble-square-bracket-attributes` command line flag, which seems to not be used anywhere. At least a code search exclusively found mentions of it in documentation: https://sourcegraph.com/search?q=context:global+-fdouble-square-bracket-attributes+-file:clang/*+-file:test/Sema/*+-file:test/Parser/*+-file:test/AST/*+-file:test/Preprocessor/*+-file:test/Misc/*+archived:yes&patternType=standard&sm=0&groupBy=repo RFC: https://discourse.llvm.org/t/rfc-enable-c-11-c2x-attributes-in-all-standard-modes-as-an-extension-and-remove-fdouble-square-bracket-attributes This enables `[[]]` attributes in all C and C++ language modes without warning by default. `-Wc++-extensions` does warn. GCC has enabled this extension in all C modes since GCC 10. Reviewed By: aaron.ballman, MaskRay Spies: #clang-vendors, beanz, JDevlieghere, Michael137, MaskRay, sstefan1, jplehr, cfe-commits, lldb-commits, dmgreen, jdoerfert, wenlei, wlei Differential Revision: https://reviews.llvm.org/D151683
52 lines
1.0 KiB
C
52 lines
1.0 KiB
C
// RUN: %clang_cc1 %s -fsyntax-only -verify
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void g(void) {
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if (1)
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[[clang::likely]] {}
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}
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void m(void) {
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[[clang::likely]] int x = 42; // expected-error {{'likely' attribute cannot be applied to a declaration}}
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if (x)
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[[clang::unlikely]] {}
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if (x) {
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[[clang::unlikely]];
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}
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switch (x) {
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case 1:
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[[clang::likely]] {}
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break;
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[[clang::likely]] case 2 : case 3 : {}
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break;
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}
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do {
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[[clang::unlikely]];
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} while (x);
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do
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[[clang::unlikely]] {}
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while (x);
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do { // expected-note {{to match this 'do'}}
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}
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[[clang::unlikely]] while (x); // expected-error {{expected 'while' in do/while loop}}
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for (;;)
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[[clang::unlikely]] {}
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for (;;) {
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[[clang::unlikely]];
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}
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while (x)
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[[clang::unlikely]] {}
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while (x) {
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[[clang::unlikely]];
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}
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if (x)
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goto lbl;
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// FIXME: allow the attribute on the label
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[[clang::unlikely]] lbl : // expected-error {{'unlikely' attribute cannot be applied to a declaration}}
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[[clang::likely]] x = x + 1;
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[[clang::likely]]++ x;
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}
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