rsmith added inline comments.
================
Comment at: include/clang/Driver/CC1Options.td:702-703
@@ -701,2 +701,4 @@
HelpText<"Allow variadic functions in CUDA device code.">;
+def fcuda_relaxed_constexpr : Flag<["-"], "fcuda-relaxed-constexpr">,
+ HelpText<"Treat constexpr functions as __host__ __device__.">;
----------------
jlebar wrote:
> rsmith wrote:
> > Is there a better name we can use for this? I don't think this is "relaxed"
> > in any obvious sense. `-fcuda-host-device-constexpr` or
> > `-fcuda-constexpr-on-device` might be clearer?
> "relaxed constexpr" is nvidia's term -- do you think it might be helpful to
> use the same terminology? I understand there's some prior art here, with
> respect to clang accepting gcc's flags, although the situation here is of
> course different.
I think it's problematic to use that terminology, as "relaxed constexpr" is
also used to describe the C++14 `constexpr` rules (see
[n3652](http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3652.html)).
================
Comment at: lib/Driver/Tools.cpp:3597
@@ -3596,2 +3596,3 @@
CmdArgs.push_back("-fcuda-disable-target-call-checks");
+ CmdArgs.push_back("-fcuda-relaxed-constexpr");
}
----------------
jlebar wrote:
> rsmith wrote:
> > For flags that are enabled by default, we usually have the -cc1 flag be a
> > `-fno-*` flag. This allows people to use (for instance) `clang blah.cu
> > -Xclang -fno-cuda-relaxed-constexpr` if necessary.
> Yeah, Artem and I had a discussion about this yesterday. As you can see,
> there are two other flags above which are turned on by default -- these also
> lack -fno variants.
>
> I think it would be good to be consistent here. I'm tempted to add another
> patch below this one which makes the other two -fno, then we can make this
> one -fno as well. It seems that convention is to just get rid of the
> existing non-fno flags, rather than leave both positive and negative versions.
>
> Does that sound OK to you?
Yes, that sounds fine.
http://reviews.llvm.org/D18380
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