[c++2a] Add option -std=c++2a to enable support for potential/transitional C++2a features
- as usual C++2a implies all the C++'s that came before it.
Thank you Aaron for the feedback here: https://reviews.llvm.org/D35454
llvm-svn: 308118
diff --git a/clang/lib/Frontend/InitPreprocessor.cpp b/clang/lib/Frontend/InitPreprocessor.cpp
index 71420df..64128df 100644
--- a/clang/lib/Frontend/InitPreprocessor.cpp
+++ b/clang/lib/Frontend/InitPreprocessor.cpp
@@ -374,10 +374,13 @@
else if (!LangOpts.GNUMode && LangOpts.Digraphs)
Builder.defineMacro("__STDC_VERSION__", "199409L");
} else {
+ // FIXME: Use correct value for C++20.
+ if (LangOpts.CPlusPlus2a)
+ Builder.defineMacro("__cplusplus", "201707L");
// C++17 [cpp.predefined]p1:
// The name __cplusplus is defined to the value 201703L when compiling a
// C++ translation unit.
- if (LangOpts.CPlusPlus1z)
+ else if (LangOpts.CPlusPlus1z)
Builder.defineMacro("__cplusplus", "201703L");
// C++1y [cpp.predefined]p1:
// The name __cplusplus is defined to the value 201402L when compiling a