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
78 lines
1.6 KiB
C
78 lines
1.6 KiB
C
// RUN: %clang_cc1 -std=c11 -E -P %s -o - | FileCheck %s
|
|
// RUN: %clang_cc1 -std=c2x -E -P %s -o - | FileCheck %s
|
|
|
|
#define C2x(x) x: __has_c_attribute(x)
|
|
|
|
// CHECK: fallthrough: 201910L
|
|
C2x(fallthrough)
|
|
|
|
// CHECK: __nodiscard__: 202003L
|
|
C2x(__nodiscard__)
|
|
|
|
// CHECK: selectany: 0
|
|
C2x(selectany); // Known attribute not supported in C mode
|
|
|
|
// CHECK: frobble: 0
|
|
C2x(frobble) // Unknown attribute
|
|
|
|
// CHECK: frobble::frobble: 0
|
|
C2x(frobble::frobble) // Unknown vendor namespace
|
|
|
|
// CHECK: clang::annotate: 1
|
|
C2x(clang::annotate)
|
|
|
|
// CHECK: deprecated: 201904L
|
|
C2x(deprecated)
|
|
|
|
// CHECK: maybe_unused: 202106L
|
|
C2x(maybe_unused)
|
|
|
|
// CHECK: __gnu__::warn_unused_result: 202003L
|
|
C2x(__gnu__::warn_unused_result)
|
|
|
|
// CHECK: gnu::__warn_unused_result__: 202003L
|
|
C2x(gnu::__warn_unused_result__)
|
|
|
|
// Test that macro expansion of the builtin argument works.
|
|
#define C clang
|
|
#define L likely
|
|
#define CL clang::likely
|
|
#define N nodiscard
|
|
|
|
#if __has_c_attribute(N)
|
|
int has_nodiscard;
|
|
#endif
|
|
// CHECK: int has_nodiscard;
|
|
|
|
#if __has_c_attribute(C::L)
|
|
int has_clang_likely_1;
|
|
#endif
|
|
// CHECK: int has_clang_likely_1;
|
|
|
|
#if __has_c_attribute(clang::L)
|
|
int has_clang_likely_2;
|
|
#endif
|
|
// CHECK: int has_clang_likely_2;
|
|
|
|
#if __has_c_attribute(C::likely)
|
|
int has_clang_likely_3;
|
|
#endif
|
|
// CHECK: int has_clang_likely_3;
|
|
|
|
#if __has_c_attribute(CL)
|
|
int has_clang_likely_4;
|
|
#endif
|
|
// CHECK: int has_clang_likely_4;
|
|
|
|
#define FUNCLIKE1(x) clang::x
|
|
#if __has_c_attribute(FUNCLIKE1(likely))
|
|
int funclike_1;
|
|
#endif
|
|
// CHECK: int funclike_1;
|
|
|
|
#define FUNCLIKE2(x) _Clang::x
|
|
#if __has_c_attribute(FUNCLIKE2(likely))
|
|
int funclike_2;
|
|
#endif
|
|
// CHECK: int funclike_2;
|