Re: Interest for C++20 modules support of boost officially

From: Peter Dimov (pdimov_at_[hidden])
Date: 2024-12-22 16:27:10

Ruben Perez wrote:
> On Sun, 22 Dec 2024 at 17:02, Peter Dimov via Boost <boost_at_[hidden]>
> wrote:
> >
> > Ruben Perez wrote:
> > > install(TARGETS ${LIB} EXPORT ${LIB}-targets
> > >   RUNTIME DESTINATION "${CMAKE_INSTALL_BINDIR}"
> > >   LIBRARY DESTINATION "${CMAKE_INSTALL_LIBDIR}"
> > >   ARCHIVE DESTINATION "${CMAKE_INSTALL_LIBDIR}"
> > >   PRIVATE_HEADER DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}"
> > >   PUBLIC_HEADER DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}"
> > >   FILE_SET CXX_MODULES DESTINATION .
> > > )
> >
> > `DESTINATION .`? Where does this put the module files? In /usr?
> 
> No. It places them under ${CMAKE_INSTALL_PREFIX}/./modules/${LIB}.cxx.

If we assume the default prefix of /usr, this means /usr/modules/core.cxx,
which doesn't seem quite right on a number of levels.

My instinct was to call the source file boost_core.cppm, and it seems like
it was correct.

The current convention for modules seems to be either
CMAKE_INSTALL_LIBDIR or CMAKE_INSTALL_DATADIR.