Add a -Wc++0x-compat warning for C++11 keywords used as identifiers when in
C++98 mode. Only the first occurrence of each keyword will produce a warning.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@141700 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Lex/Preprocessor.cpp b/lib/Lex/Preprocessor.cpp
index dee98ea..31662ad 100644
--- a/lib/Lex/Preprocessor.cpp
+++ b/lib/Lex/Preprocessor.cpp
@@ -513,6 +513,17 @@
}
}
+ // If this identifier is a keyword in C++11, produce a warning. Don't warn if
+ // we're not considering macro expansion, since this identifier might be the
+ // name of a macro.
+ // FIXME: This warning is disabled in cases where it shouldn't be, like
+ // "#define constexpr constexpr", "int constexpr;"
+ if (II.isCXX11CompatKeyword() & !DisableMacroExpansion) {
+ Diag(Identifier, diag::warn_cxx11_keyword) << II.getName();
+ // Don't diagnose this keyword again in this translation unit.
+ II.setIsCXX11CompatKeyword(false);
+ }
+
// C++ 2.11p2: If this is an alternative representation of a C++ operator,
// then we act as if it is the actual operator and not the textual
// representation of it.