[Bug other/101711] Error when gcc cross compile libvtv

["bootmgr at 163 dot com" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101711

--- Comment #8 from bootmgr at 163 dot com <bootmgr at 163 dot com> ---
(In reply to ctice from comment #6)
> I applied the patch supplied in comment 5.  I added
> --with-sysroot=/usr/local to my configure command (still not using
> --enable-threads=mcf or --enable-vtable-verify).  Now it configures, but the
> make command fails while building gcc, complaining that:
> 
> The directory that should contain system headers does not exist:
>   /usr/local/mingw/include
> 
> Which is completely true.  I'm working on an elf/linux machine (x86_64) and
> I have no mingw headers.  Where can I get the appropriate headers (and
> anything else I will need) in order to make this cross compile work?

Compiling a cross toolchain can be a bit complicated.
The mingw-w64 wiki has documentation on how to compile the mingw cross
toolchain.
https://sourceforge.net/p/mingw-w64/wiki2/Cross%20Win32%20and%20Win64%20compiler/
If you want other thread models (other than win32), you can compile the
winpthreads library (--enable-threads=posix) or copy release/mingw64/*
(--enable-threads) from the mcfgthread repository to
/path/to/install/x86_64-w64-mingw32/ after compiling crt.