[Support][Compiler] Add LLVM_HAS_VARIADIC_TEMPLATES.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@174913 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/include/llvm/Support/Compiler.h b/include/llvm/Support/Compiler.h
index 61c40f4a19a16703eb434f74a9aef641f77c4be4..92835fce542b25e2f59fe5eb18e040950b266ed4 100644 (file)
--- a/include/llvm/Support/Compiler.h
+++ b/include/llvm/Support/Compiler.h
@@ -71,6 +71,16 @@
 #define LLVM_HAS_CXX11_STDLIB 0
 #endif
 
+/// \macro LLVM_HAS_VARIADIC_TEMPLATES
+/// \brief Does this compiler support variadic templates.
+///
+/// Implies LLVM_HAS_RVALUE_REFERENCES and the existence of std::forward.
+#if __has_feature(cxx_variadic_templates)
+# define LLVM_HAS_VARIADIC_TEMPLATES 1
+#else
+# define LLVM_HAS_VARIADIC_TEMPLATES 0
+#endif
+
 /// llvm_move - Expands to ::std::move if the compiler supports
 /// r-value references; otherwise, expands to the argument.
 #if LLVM_HAS_RVALUE_REFERENCES