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

Mueller-Roemer, Johannes Sebastian
Wed, 24 Sep 2014 06:06:55 -0000

I would love to see libc++ working on Windows. In any case, I personally use
MinGW with pthreads, as that supports std::thread etc. Yes, it uses
libwinpthread, but that shouldn’t really be an issue.

--
Johannes S. Mueller-Roemer, MSc
Wiss. Mitarbeiter - Interactive Engineering Technologies (IET)

Fraunhofer-Institut für Graphische Datenverarbeitung IGD
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From: llvmdev-bounces at cs.uiuc.edu [mailto:llvmdev-bounces at cs.uiuc.edu] On
Behalf Of Chandler Carruth
Sent: Wednesday, September 24, 2014 03:02
To: LLVM Developers Mailing List; clang-dev Developers; lldb-dev at cs.uiuc.edu;
Chris Bieneman; Reid Kleckner; David Majnemer; Alex Rosenberg; Zachary Turner
Subject: [LLVMdev] RFC: LLVM should require a working C++11 <thread>,
<mutex>, and <atomic>

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:

1) Sane host toolchain on Windows that doesn't require downloading MSVC.
(I'm dubious about the value of this one...)

2) Cross-compiling a Windows clang.exe (and other tools) from a Linux (or other
host) box.

Are there others? (And thanks to Reid for explaining these to me!)


I'm somewhat dubious about #1, but if we address #2 it will address any
concerns with #1 anyways.

I would like to propose that we finish implementing libc++ sufficiently to host
Clang on Windows using native Windows APIs to implement things. Then we document
very clearly what is required to download the basic Windows SDK and cross
compile Clang (and any other tools) for Windows using just libc++ and the SDK.
No need for MSVC bits, etc. Would this be acceptable?

If not, would it be acceptable to use libc++ on top of mingw (so just avoiding
libstdc++)? I *really* don't want to spend lots of time going there because
it seems like a low-value platform, but we can.

Anyways, I want to tease out anything else required here because if this is all
we need, I think we can make it a reality and get to a much saner platform.
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