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From: Tony Kelman <tony AT kelman DOT net>
To: "cygwin AT cygwin DOT com" <cygwin AT cygwin DOT com>
Subject: RE: [ANNOUNCEMENT] Assorted MinGW-w64 toolchain libraries and tools
Date: Sun, 14 Feb 2016 12:02:29 -0800
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References: <announce DOT 56BB74B0 DOT 8010306 AT cygwin DOT com> <loom DOT 20160210T212108-245 AT post DOT gmane DOT org>,<56BBDCBE DOT 2050208 AT cygwin DOT com>,<BAY169-W1394D7AC30EB8F5CC92A73BA7A80 AT phx DOT gbl>
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>> LLVM/Clang version bumps are time-consuming to get right. I actually
>> looked at 3.6, but MCJIT did not work OOTB with PE/COFF targets. I'll
>> have to see what the story is with 3.7.
>
> Understandable. 3.8 is in RC right now so maybe try building the
> release_38 branch if you get to it soon, otherwise wait a few weeks.
> I'm trying to figure out how to cross-build mingw llvm via cmake
> now that they've deprecated autotools (it's still there in 3.8 with
> a warning, but has been deleted on trunk which will become 3.9).

Okay, just FYI, building LLVM 3.8 or newer will fail with a win32-threads
build of mingw-w64 unless you build with LLVM_ENABLE_THREADS=0
and completely stub out lib/Support/ThreadPool.cpp. We're using MCJIT
(actually the new ORCJIT) in Julia and it's slower than the old JIT but
mostly works.

> I'll check your i686-libgit2 package soon, but I suspect it may be
> affected by https://github.com/libgit2/libgit2/issues/3342 and need
> to be built with -mincoming-stack-boundary=2

Confirmed.

$ echo '#include "git2.h"
void main() {
    git_repository* repo_ptr = NULL;
    char* repo_url = "https://github.com/JuliaLang/Example.jl";
    char* repo_path = "Example.Bare";
    git_clone_options clone_opts = GIT_CLONE_OPTIONS_INIT;
    clone_opts.bare = 1;
    git_libgit2_init();
    git_clone(&repo_ptr, repo_url, repo_path, &clone_opts);
    git_libgit2_shutdown();
}'> clonetest.c

Tony AT LAPTOP-O230JCFF ~
$ i686-w64-mingw32-gcc -L/usr/i686-w64-mingw32/sys-root/mingw/bin \
  -lgit2 clonetest.c -g -o /usr/i686-w64-mingw32/sys-root/mingw/bin/clonetest.exe

Tony AT LAPTOP-O230JCFF ~
$ gdb -q /usr/i686-w64-mingw32/sys-root/mingw/bin/clonetest.exe
Reading symbols from /usr/i686-w64-mingw32/sys-root/mingw/bin/clonetest.exe...done.
(gdb) r
Starting program: /usr/i686-w64-mingw32/sys-root/mingw/bin/clonetest.exe
[New Thread 8788.0x794]
[New Thread 8788.0x209c]
[New Thread 8788.0x638]
[New Thread 8788.0x123c]

Program received signal SIGSEGV, Segmentation fault.
0x6ccf9188 in libgit2!git_filebuf_commit ()
   from /usr/i686-w64-mingw32/sys-root/mingw/bin/libgit2.dll

(be sure to `rm -rf Example.Bare` between runs of this test program)


 		 	   		  
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