I don't think that should be necessary, GCC has supported all of C++14 
since version 6 (mid 2016), and all of C++17 since last year.

On Wednesday, February 14, 2018 at 10:22:49 AM UTC, Yang Guo wrote:
>
> I think you also need to disable cxx14.
>
> On Wed, Feb 14, 2018, 09:37 Ben Noordhuis <in...@bnoordhuis.nl 
> <javascript:>> wrote:
>
>> On Wed, Feb 14, 2018 at 12:59 AM,  <aa...@correspondwith.me <javascript:>> 
>> wrote:
>> > I'm working on a RISC-V target for V8. Currently the LLVM toolchain for
>> > RISC-V is less mature and accessible than the GCC one (which is 
>> available
>> > upstream as of GCC 7.1 or thereabouts), so I'm wondering if and how I 
>> might
>> > could the V8 build to use GCC to compile V8 (so that I can run V8 as a 
>> whole
>> > in QEMU before getting the in-tree simulator up and running).
>> >
>> > Thanks. :- )
>>
>> It's been some time since I last tried it but passing `is_clang=false
>> use_sysroot=false` to tools/dev/v8gen.py should do it.
>>
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