----- Original Message ----- > From: "Richard Smith via cfe-commits" <cfe-commits@lists.llvm.org> > To: "cfe-commits" <cfe-commits@lists.llvm.org>, "Clang Dev" > <cfe-...@lists.llvm.org> > Sent: Wednesday, June 29, 2016 2:09:37 PM > Subject: RFC: Default language standard mode policy
> Hi all! > I'd like to establish a policy for Clang's default language standard > (if none is specified with -std), as follows: > Clang defaults to the most recent published standard for the selected > language that it fully implements. > The practical impact of this is that clang++ will default to C++14 > for C++ compilations (for version 3.9 onwards) and will default to > C++17 once our implementation support is complete and the standard > is published (whichever happens later). I think that we need to include libc++ in this criteria as well. I think we'll also need some CMake flags to adjust the default for builds for systems on which this won't work. > I'd suggest that we apply the same policy for clang-cl, but if it's > important that we enable a not-yet-fully-implemented standard for cl > compatibility, that seems reasonable. > The question of whether the default mode for the GCC-compatible > driver should be -std=gnuXXX or -std=cXXX is separate, but also > likely worth discussing. Enabling GNU keywords by default is a very > odd choice, and if we believe we can change our defaults without > breaking the world then this seems like a good time to do so. Unfortunately, on many systems, some standard system headers won't even parse without GNU extensions enabled. I think we'll need to leave the GNU extensions on by default (at least for parsing system headers). > I also intend to make explicit in our documentation that our -std=XXX > flag enables the selected standard, *plus all relevant issues in > Defect Report status from the relevant language committee* (it > doesn't make sense to support a language without its bugfixes). +1 -Hal > Thoughts? > _______________________________________________ > cfe-commits mailing list > cfe-commits@lists.llvm.org > http://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits -- Hal Finkel Assistant Computational Scientist Leadership Computing Facility Argonne National Laboratory
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