[Openmp-dev] [RFC]Requiring C++14 for the OpenMP subproject

[Hal Finkel via Openmp-dev]

On 2/11/20 4:56 AM, Jon Chesterfield via Openmp-dev wrote:
>
>     Hmm, so you propose creating a dependency from the OpenMP runtime to
>     the LLVM libraries? Which classes would you want to use, probably some
>     of the ADTs? Does any of the other runtime libraries (libc++,
>     libc++abi, compiler-rt, sanitizers) already do this? IIRC
>     libc++abi and
>     LLVMSupport share some demangling code, but that is manually copied.
>
>
> I am unaware that each subproject reimplements code to avoid a 
> dependency on llvm. My first reaction is "surely not", but it's not 
> totally implausible. I will look into this.
>
> ADT is the obvious contender for reuse. There will also be a lot of OS 
> wrappers somewhere. File IO, dlopen, probably memory allocators. 
> Essentially all the stuff a big cross platform C++ project grows over 
> time. In the case of anything hitting the filesystem, also 
> treacherously difficult to get right across platforms.
>
> There's an open patch against libomptarget that uses dlopen with a 
> hardcoded path length. Opt loads shared libraries on windows afaik so 
> probably has a robust wrapper around dlopen, so I'd start there.


I would separate these two discussions. One motivation for the 
relicensing effort is to allow sharing code between runtime libraries 
and the core infrastructure. I expect that, as we move to full coverage 
on various parts of the relicensing, we'll have a large-scale discussion 
about how to implement this resuse across the project. However, we can 
certainly use C++14 language features before we worry about using LLVM's 
support library.

  -Hal


>
> Jon
>
>
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-- 
Hal Finkel
Lead, Compiler Technology and Programming Languages
Leadership Computing Facility
Argonne National Laboratory

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