[cfe-dev] Setting default dialect to C++11

Mehdi AMINI via cfe-dev cfe-dev at lists.llvm.org
Sun Oct 15 12:28:40 PDT 2017


This thread died 6 weeks ago and we're still using gnu++98 as a default as
far as I can tell, what's the plan? Shall we make the switch in trunk? I
suspect we would want this to happen early in the release cycle rather than


2017-08-24 17:33 GMT-07:00 Richard Smith via cfe-dev <cfe-dev at lists.llvm.org

> On 24 August 2017 at 15:18, Tim Northover via cfe-dev <
> cfe-dev at lists.llvm.org> wrote:
>> Hi Paul,
>> On 24 August 2017 at 14:10, Robinson, Paul via cfe-dev
>> <cfe-dev at lists.llvm.org> wrote:
>> > It's clearly too late to make a change like this for 5.0.  Is there any
>> > remaining roadblock to making the change for 6.0 (trunk)?
>> I've been slowly trying to make Clang C++14 clean. I think most of the
>> actual changes needed for Clang are in place now (the big one was
>> making C++14 mode friendlier to imaginary constants) and the rest is
>> fixing up tests.
>> I think most of the test changes are because the wording on how the
>> arguments to "operator new" get treated (promotion etc) was changed.
>> I've attached a WiP diff here for reference. Unfortunately it's not
>> even complete and these 4 tests still fail:
>>     Clang :: CodeGenCXX/vtable-available-externally.cpp
>>     Clang :: Lexer/cxx-features.cpp
>>     Clang :: OpenMP/taskloop_reduction_codegen.cpp
>>     Clang :: OpenMP/taskloop_simd_reduction_codegen.cpp
>> I don't even think they're particularly difficult ones, just where I
>> happened to stop when I last looked at it. I've also got to address
>> some review comments from Richard (I haven't forgotten) to make sure
>> we haven't decreased C-mode OpenMP coverage.
>> There are also a handful of bits of the test-suite that need to
>> explicitly specify c++98.
>> So I think the actual work needed is pretty small (and I can find time
>> to do it, probably even this weekend or something). We just need to
>> make the decision: C++11 or C++14 and go or no-go. My vote is go and
>> C++14.
> +1. I think it would also make sense to include in the Clang 5 release
> notes that we intend for this to be the last release that defaults to
> -std=gnu++98.
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