[LLVMdev] RFC: LLVM should require a working C++11 , , and

Yaron Keren
Wed, 24 Sep 2014 13:31:30 -0000

Hi Oscar,

The question is should llvm start using <thread> and <mutex> when
mingw+win32 threads does not support these.

What is the reason to use mingw+win32 threads instead of mingw+pthreads
which does support the above?

Yaron


2014-09-24 15:47 GMT+03:00 Óscar Fuentes <ofv at wanadoo.es>:

> Chandler Carruth <chandlerc at gmail.com> writes:
>
> > AKA: MinGW + win32threads is holding LLVM (and all of its subprojects)
> > back. We need to stop supporting this host platform.
> >
> > I'm aware of essentially 2 reasonably important use cases for
supporting
> > MinGW + win32threads:
>
> I suppose that you are talking about MinGW (www.mingw.org) all along
> and not about MinGW-w64 (www.mingw-w64.org) which supports the features
> you are missing.
>
> > 1) Sane host toolchain on Windows that doesn't require downloading
MSVC.
> > (I'm dubious about the value of this one...)
>
> Oh, well. You are talking about "everything that is not MSVC++".
Ok.
>
> > 2) Cross-compiling a Windows clang.exe (and other tools) from a Linux
(or
> > other host) box.
>
> I have no idea how cross-compiling from other OS can solve shortcomings
> on the *runtime* libraries of a toolchain.
>
> [snip]
>
> > I *really* don't want to spend lots of time going
> > there because it seems like a low-value platform, but we can.
>
> Thanks, I knew that you consider MinGW* "low-value" all along.
MinGW-w64
> is well ahead of MSVC++ on C++ language and library support, and it is
> very likely that it will remain that way, but you take every chance to
> bad-mouth it to promote MSVC++ support on LLVM/Clang.
>
> [snip]
>
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