Master uncompilable on cygwin

[Thibaut Cuvelier]

On Sat, 5 Mar 2022 at 02:24, Enrico Forestieri <forenr at lyx.org> wrote:

> This is the error:
>
> In file included from ../../../../src/frontends/qt/GuiBibtex.cpp:21:
> ../../../../src/Encoding.h: In member function
> ‘std::vector<std::basic_string<unsigned int, std::char_traits<unsigned
> int>, std::allocator<unsigned int> > > lyx::CharInfo::textCommands() const’:
> ../../../../src/Encoding.h:82:62: error: could not convert ‘((const
> lyx::CharInfo*)this)->lyx::CharInfo::text_commands_’ from
> ‘vector<lyx::trivial_string<unsigned int>>’ to
> ‘vector<std::basic_string<unsigned int, std::char_traits<unsigned int>,
> std::allocator<unsigned int> >>’
>    82 |         std::vector<docstring> textCommands() const { return
> text_commands_; }
>       |
> ^~~~~~~~~~~~~~
>       |                                                              |
>       |
> vector<lyx::trivial_string<unsigned int>>
> ../../../../src/Encoding.h: In member function
> ‘std::vector<std::basic_string<unsigned int, std::char_traits<unsigned
> int>, std::allocator<unsigned int> > > lyx::CharInfo::mathCommands() const’:
> ../../../../src/Encoding.h:86:62: error: could not convert ‘((const
> lyx::CharInfo*)this)->lyx::CharInfo::math_commands_’ from
> ‘vector<lyx::trivial_string<unsigned int>>’ to
> ‘vector<std::basic_string<unsigned int, std::char_traits<unsigned int>,
> std::allocator<unsigned int> >>’
>    86 |         std::vector<docstring> mathCommands() const { return
> math_commands_; }
>       |
> ^~~~~~~~~~~~~~
>       |                                                              |
>       |
> vector<lyx::trivial_string<unsigned int>>
>

I wrote that change, but I had no problems compiling it with more or less
recent compilers (including Visual C++, which tends to have idiosyncrasies
compared to GCC and LLVM). What version of GCC do you use?

What's strange is that strfwd.h typeders trivdocstring as docstring (unless
STD_STRING_USES_COW is defined). I have no idea what this macro exactly
does and when it is set, though :/.
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