rsmith added a comment.
Accepting this under `-std=c2x` is premature. We don't even know whether there
will be such a standard yet, and this has not been voted into a working draft.
But the `-f` flag form is OK.
================
Comment at: include/clang/Driver/Options.td:607
+def fcattributes : Flag<["-"], "fc-attributes">, Group<f_Group>,
+ Flags<[DriverOption, CC1Option]>, HelpText<"Enable '[[]]' attributes in C">;
----------------
Missing underscore between "fc" and "attributes".
================
Comment at: lib/Parse/ParseDecl.cpp:1512
/// should try to parse it.
-bool Parser::DiagnoseProhibitedCXX11Attribute() {
+bool Parser::DiagnoseProhibitedAttribute() {
assert(Tok.is(tok::l_square) && NextToken().is(tok::l_square));
----------------
This name should still reference the syntax used, since it is specific to
[[...]] attribute syntax. Calling that CXX11 attribute syntax (even when used
in C) doesn't seem overly confusing to me. If you want a different name for
this, I'd be OK with that, but it should not be simply "Attribute".
https://reviews.llvm.org/D37436
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