Master uncompilable on cygwin

[Enrico Forestieri]

On Sat, Mar 05, 2022 at 02:47:16AM +0100, Thibaut Cuvelier wrote:
> 
> 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?

Yes, biset points at 3f9e21b8. The GCC version is 11.2.0.

> 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 :/.

I think it refers to copy-on-write. I think mingw uses COW but not cygwin.

-- 
Enrico