On 2017/5/11 21:51, David Grayson wrote:
> Unfortunately, my patch seems to break several classes in libstdc++,
> preventing Qt from building. The problem is that driverspecs.h defines
> __in to be empty so we can compile Microsoft-type code that uses __in as a
> source annotation on function parameters while GCC's libstdc++ uses __in as
> the name of an input argument for many of its methods:
>
> $ egrep -lr '\b__in\b' /mingw32/include/
> /mingw32/include/c++/6.3.0/bits/basic_string.h
> /mingw32/include/c++/6.3.0/bits/basic_string.tcc
> /mingw32/include/c++/6.3.0/bits/istream.tcc
> /mingw32/include/c++/6.3.0/bits/locale_facets.h
> /mingw32/include/c++/6.3.0/ext/random.tcc
> /mingw32/include/c++/6.3.0/ext/vstring.tcc
> /mingw32/include/c++/6.3.0/istream
> /mingw32/include/c++/6.3.0/tr1/tuple
> /mingw32/include/c++/6.3.0/tr1/utility
> /mingw32/include/c++/6.3.0/tr2/bool_set
> /mingw32/include/c++/6.3.0/tr2/bool_set.tcc
> /mingw32/include/c++/6.3.0/tuple
> /mingw32/include/c++/6.3.0/utility
>
> One of the errors I get looks like this:
>
> /nix/.../include/c++/6.3.0/utility:208:57: error: no matching function for
> call to 'move()'
> { return __pair_get<_Int>::__move_get(std::move(__in)); }
>
> I don't think this is necessarily a problem with mingw-w64, or a problem
> with that patch. Adrien Nader's attitude on this mailing list in
> 2015-11-03 was "Really, there's a platform and software is built on top of
> it; it is that software that is supposed to adapt to the platform." Microsoft
> Windows and mingw-w64 are platforms that define __in to have a special
> meaning. The software built on that platform (libstdc++) should adapt to
> the platform.
I CC'd gcc-help. Hope it helps.
Anyway Windows headers are really a can of worms (think about the macros
`min` and `max` for example).
> One odd thing is that our __in gets defined in driverspecs.h, while
> Microsoft defines their __in in sal.h. But specstrings.h (for both
> mingw-w64 and Microsoft) includes both sal.h and driverspecs.h so that
> shouldn't affect when the bug appears.
Both headers seem to be out of sync for years. I hope they can be
updated someday.
--
Best regards,
LH_Mouse
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