I looked into this a little bit by compiling some test C programs and by
running
egrep '#define\s+_WIN32_WINNT\b' -r /mingw64/x86_64-w64-mingw32/include/
It looks like _WIN32_WINNT is defined to be 0x502 in _mingw.h if the user
has not defined it already. That file comes from the mingw-w64 project.
You can define _WIN32_WINNT yourself using a compiler flag when you compile
a project.
My understanding is that there are many Windows XP users left and that the
MSYS2 maintainers intend to support them. Compiling the boost library with
a higher version number would probably make the DLL fail to load on Windows
XP systems.
It looks you posted this in a few other places and that you succeeded in
compiling a special version of the Boost package with a different
_WIN32_WINNT:
https://github.com/Alexpux/MINGW-packages/issues/1305
https://svn.boost.org/trac/boost/ticket/12119
--David Grayson
On Sun, Apr 10, 2016 at 2:17 PM, Mario Emmenlauer <[email protected]>
wrote:
>
> Dear All,
>
> I've run into an issue twice in the last days, so I wanted to kindly ask
> for your input. Two packages I want to use are gRPC (the Google cross
> platform RPC library) and boost::filesystem, and both require _WIN32_WINNT
> to be defined to at least 0x0600. boost::filesystem seems to support sym-
> links only when _WIN32_WINNT is defined to at least 0x0600. I did not delve
> deeply into this, but that was my take from the following report, and I've
> been plagued by the same issue:
>
> http://stackoverflow.com/questions/19471266/boostfilesystemcreate-symlink-not-supported
>
>
> Is _WIN32_WINNT defined by default? If yes, by whom (MSYS2, or MinGW64
> gcc)?
> If its not defined by default, should packages set it via CFLAGS, or is
> there
> a good policy how I can compile for a specific Windows version (Vista /
> newer)?
> Would it maybe make sense to set 0x0600 (Vista) as a default, in order to
> enable "modern" things like symlinks? Or are there still XP users left? :-)
>
> Cheers,
>
> Mario
>
>
>
>
>
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