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-rw-r--r--gcc/doc/cpp.texi5
1 files changed, 4 insertions, 1 deletions
diff --git a/gcc/doc/cpp.texi b/gcc/doc/cpp.texi
index 8e9cba3..52f2606 100644
--- a/gcc/doc/cpp.texi
+++ b/gcc/doc/cpp.texi
@@ -1877,7 +1877,10 @@ selected, the value of the macro is
@code{199711L} for the 1998 C++ standard,
@code{201103L} for the 2011 C++ standard,
@code{201402L} for the 2014 C++ standard,
-@code{201703L} for the 2017 C++ standard.
+@code{201703L} for the 2017 C++ standard,
+or an unspecified value strictly larger than @code{201703L} for the
+experimental languages enabled by @option{-std=c++2a} and
+@option{-std=gnu++2a}.
@item __OBJC__
This macro is defined, with value 1, when the Objective-C compiler is in