I haven't often attempted to build Qt myself, so I'm not 100% sure of
the process, but trying to run 'configure' in Windows 10 I get the
following error:
C:\Program Files (x86)\Microsoft Visual
Studio\2017\Community\VC\Tools\MSVC\14.15.26726\include\type_traits(1271):
error C2338: You've instantiated std::aligned_storage<Len, Align> with
an extended alignment (in other words, Align > alignof(max_align_t)).
Before VS 2017 15.8, the member type would non-conformingly have an
alignment of only alignof(max_align_t). VS 2017 15.8 was fixed to handle
this correctly, but the fix inherently changes layout and breaks binary
compatibility (*only* for uses of aligned_storage with extended
alignments). Please define either (1) _ENABLE_EXTENDED_ALIGNED_STORAGE
to acknowledge that you understand this message and that you actually
want a type with an extended alignment, or (2)
_DISABLE_EXTENDED_ALIGNED_STORAGE to silence this message and get the
old non-conformant behavior.
Where do I need to define either _ENABLE_EXTENDED_ALIGNED_STORAGE or
_DISABLE_EXTENDED_ALIGNED_STORAGE? Is this something I can do on the
command line? Thanks for any suggestions.
Best regards,
Tim Grove
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