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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
27 lines
2.0 KiB
C
27 lines
2.0 KiB
C
// RUN: %clang_cc1 -fsyntax-only -verify %s
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int var __attribute__((internal_linkage));
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int var2 __attribute__((internal_linkage,common)); // expected-error{{'common' and 'internal_linkage' attributes are not compatible}} \
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// expected-note{{conflicting attribute is here}}
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int var3 __attribute__((common,internal_linkage)); // expected-error{{'internal_linkage' and 'common' attributes are not compatible}} \
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// expected-note{{conflicting attribute is here}}
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int var4 __attribute__((common)); // expected-note{{previous declaration is here}} expected-note{{conflicting attribute is here}}
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int var4 __attribute__((internal_linkage)); // expected-error{{'internal_linkage' and 'common' attributes are not compatible}} \
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// expected-error{{'internal_linkage' attribute does not appear on the first declaration}}
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int var5 __attribute__((internal_linkage)); // expected-note{{conflicting attribute is here}}
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int var5 __attribute__((common)); // expected-error{{'common' and 'internal_linkage' attributes are not compatible}}
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__attribute__((internal_linkage)) int f(void) {}
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struct __attribute__((internal_linkage)) S { // expected-warning{{'internal_linkage' attribute only applies to variables, functions, and classes}}
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};
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__attribute__((internal_linkage("foo"))) int g(void) {} // expected-error{{'internal_linkage' attribute takes no arguments}}
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int var6 [[clang::internal_linkage]];
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int var7 [[clang::internal_linkage]] __attribute__((common)); // expected-error{{'internal_linkage' and 'common' attributes are not compatible}} \
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// expected-note{{conflicting attribute is here}}
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__attribute__((common)) int var8 [[clang::internal_linkage]]; // expected-error{{'internal_linkage' and 'common' attributes are not compatible}} \
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// expected-note{{conflicting attribute is here}}
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