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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
18 lines
1.3 KiB
C
18 lines
1.3 KiB
C
// RUN: %clang_cc1 -triple i386-apple-darwin9 -fsyntax-only -verify %s
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__attribute((regparm(2))) int x0(void);
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__attribute((regparm(1.0))) int x1(void); // expected-error{{'regparm' attribute requires an integer constant}}
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__attribute((regparm(-1))) int x2(void); // expected-error{{'regparm' parameter must be between 0 and 3 inclusive}}
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__attribute((regparm(5))) int x3(void); // expected-error{{'regparm' parameter must be between 0 and 3 inclusive}}
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__attribute((regparm(5,3))) int x4(void); // expected-error{{'regparm' attribute takes one argument}}
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void __attribute__((regparm(3))) x5(int);
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void x5(int); // expected-note{{previous declaration is here}}
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void __attribute__((regparm(2))) x5(int); // expected-error{{function declared with regparm(2) attribute was previously declared with the regparm(3) attribute}}
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[[gnu::regparm(3)]] void x6(int); // expected-note{{previous declaration is here}}
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[[gnu::regparm(2)]] void x6(int); // expected-error{{function declared with regparm(2) attribute was previously declared with the regparm(3) attribute}}
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void x6 [[gnu::regparm(3)]] (int);
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void [[gnu::regparm(3)]] x6(int); // expected-warning{{'regparm' only applies to function types; type here is 'void'}}
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void x6(int) [[gnu::regparm(3)]]; // expected-warning{{GCC does not allow the 'regparm' attribute to be written on a type}}
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