Fix __is_signed builtin

    Summary: This patch fixes the __is_signed builtin type trait to work with floating point types and enums. Now, the builtin will return true if it is passed a floating point type and false for an enum type.

    Reviewers: EricWF, rsmith, erichkeane, craig.topper, efriedma

    Subscribers: cfe-commits

    Tags: #clang

    Differential Revision: https://reviews.llvm.org/D67897

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@372621 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 1 insertions, 4 deletions

diff --git a/docs/LanguageExtensions.rst b/docs/LanguageExtensions.rst
index 23c8778113..903d450059 100644
--- a/docs/LanguageExtensions.rst
+++ b/docs/LanguageExtensions.rst
@@ -1161,10 +1161,7 @@ The following type trait primitives are supported by Clang. Those traits marked
 * ``__is_sealed`` (Microsoft):
   Synonym for ``__is_final``.
 * ``__is_signed`` (C++, Embarcadero):
-  Note that this currently returns true for enumeration types if the underlying
-  type is signed, and returns false for floating-point types, in violation of
-  the requirements for ``std::is_signed``. This behavior is likely to change in
-  a future version of Clang.
+  Returns false for enumeration types, and returns true for floating-point types. Note, before Clang 10, returned true for enumeration types if the underlying type was signed, and returned false for floating-point types.
 * ``__is_standard_layout`` (C++, GNU, Microsoft, Embarcadero)
 * ``__is_trivial`` (C++, GNU, Microsoft, Embarcadero)
 * ``__is_trivially_assignable`` (C++, GNU, Microsoft)