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Runtimes: resync from branch (NFCI)

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This restores the `LLVM_NODISCARD` macro from the branch point
(retaining the header inclusion changes). This is required to build
SwiftRemoteMirror without injecting another LLVM build.
This commit is contained in:
Saleem Abdulrasool
2025-08-05 16:24:32 -07:00
parent e9f19fcc2c
commit e637ccd708
1 changed files with 17 additions and 0 deletions
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17
stdlib/include/llvm/Support/Compiler.h
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@@ -142,6 +142,23 @@
#define LLVM_ATTRIBUTE_USED
#endif
/// LLVM_NODISCARD - Warn if a type or return value is discarded.
// Use the 'nodiscard' attribute in C++17 or newer mode.
#if defined(__cplusplus) && __cplusplus > 201402L && LLVM_HAS_CPP_ATTRIBUTE(nodiscard)
#define LLVM_NODISCARD [[nodiscard]]
#elif LLVM_HAS_CPP_ATTRIBUTE(clang::warn_unused_result)
#define LLVM_NODISCARD [[clang::warn_unused_result]]
// Clang in C++14 mode claims that it has the 'nodiscard' attribute, but also
// warns in the pedantic mode that 'nodiscard' is a C++17 extension (PR33518).
// Use the 'nodiscard' attribute in C++14 mode only with GCC.
// TODO: remove this workaround when PR33518 is resolved.
#elif defined(__GNUC__) && LLVM_HAS_CPP_ATTRIBUTE(nodiscard)
#define LLVM_NODISCARD [[nodiscard]]
#else
#define LLVM_NODISCARD
#endif
// Indicate that a non-static, non-const C++ member function reinitializes
// the entire object to a known state, independent of the previous state of
// the object.