Support: Drop LLVM_ATTRIBUTE_UNUSED_RESULT

Uses of this have all been updated to use LLVM_NODISCARD, which
matches the C++17 [[nodiscard]] semantics rather than those of GCC's
__attribute__((warn_unused_result)).

llvm-svn: 284367

diff --git a/llvm/docs/ReleaseNotes.rst b/llvm/docs/ReleaseNotes.rst
index 286cb8f..b6dfc3d 100644 (file)
--- a/llvm/docs/ReleaseNotes.rst
+++ b/llvm/docs/ReleaseNotes.rst
@@ -41,6 +41,10 @@ Non-comprehensive list of changes in this release
    functionality, or simply have a lot to talk about), see the `NOTE` below
    for adding a new subsection.
 
+* The definition and uses of LLVM_ATRIBUTE_UNUSED_RESULT in the LLVM source
+  were replaced with LLVM_NODISCARD, which matches the C++17 [[nodiscard]]
+  semantics rather than gcc's __attribute__((warn_unused_result)).
+
 * ... next change ...
 
 .. NOTE

diff --git a/llvm/include/llvm/Support/Compiler.h b/llvm/include/llvm/Support/Compiler.h
index c6e8875..eebf59a 100644 (file)
--- a/llvm/include/llvm/Support/Compiler.h
+++ b/llvm/include/llvm/Support/Compiler.h
@@ -130,15 +130,6 @@
 #define LLVM_ATTRIBUTE_USED
 #endif
 
-/// LLVM_ATTRIBUTE_UNUSED_RESULT - Deprecated. Use LLVM_NODISCARD instead.
-#if __has_attribute(warn_unused_result) || LLVM_GNUC_PREREQ(3, 4, 0)
-#define LLVM_ATTRIBUTE_UNUSED_RESULT __attribute__((__warn_unused_result__))
-#elif defined(_MSC_VER)
-#define LLVM_ATTRIBUTE_UNUSED_RESULT _Check_return_
-#else
-#define LLVM_ATTRIBUTE_UNUSED_RESULT
-#endif
-
 /// LLVM_NODISCARD - Warn if a type or return value is discarded.
 #if __cplusplus > 201402L && __has_cpp_attribute(nodiscard)
 #define LLVM_NODISCARD [[nodiscard]]