Add -f[no-]double-square-bracket-attributes as new driver options to control use of [[]] attributes in all language modes. This is the initial implementation of WG14 N2165, which is a proposal to add [[]] attributes to C2x, but also allows you to enable these attributes in C++98, or disable them in C++11 or later.

llvm-svn: 315856

1 files changed, 6 insertions, 0 deletions

diff --git a/clang/lib/Frontend/CompilerInvocation.cpp b/clang/lib/Frontend/CompilerInvocation.cpp
index 7114e654dab..9a4fc774f47 100644
--- a/clang/lib/Frontend/CompilerInvocation.cpp
+++ b/clang/lib/Frontend/CompilerInvocation.cpp
@@ -2138,6 +2138,12 @@ static void ParseLangArgs(LangOptions &Opts, ArgList &Args, InputKind IK,
     && Opts.OpenCLVersion >= 200);
   Opts.BlocksRuntimeOptional = Args.hasArg(OPT_fblocks_runtime_optional);
   Opts.CoroutinesTS = Args.hasArg(OPT_fcoroutines_ts);
+  
+  // Enable [[]] attributes in C++11 by default.
+  Opts.DoubleSquareBracketAttributes =
+      Args.hasFlag(OPT_fdouble_square_bracket_attributes,
+                   OPT_fno_double_square_bracket_attributes, Opts.CPlusPlus11);
+
   Opts.ModulesTS = Args.hasArg(OPT_fmodules_ts);
   Opts.Modules = Args.hasArg(OPT_fmodules) || Opts.ModulesTS;
   Opts.ModulesStrictDeclUse = Args.hasArg(OPT_fmodules_strict_decluse);