> I'm something of an outlier here, maintaining a big legacy MFC application that targets Windows CE, but I can't be the only one.
The problem is not developing "legacy" apps, it's comparing the development and maintenance of "legacy" apps with apps that just get started being written today, for which the bare minimum is being cross-platform.
> Are there wrappers for things like dlopen()? posix_madvise?
none that I know of :( though MS has a fairly decent "modern C++" API that covers WinRT: https://github.com/Microsoft/cppwinrt but I don't think ACLs are even available in WinRT
> Boost do seem to be aiming for complete wrapper coverage.
I don't think "boost" is aiming at anything. If you have a good idea of a library (and a good implementation!) you can submit it to boost. It's more a big repository of libraries with a somewhat consistent coding style.
The problem is not developing "legacy" apps, it's comparing the development and maintenance of "legacy" apps with apps that just get started being written today, for which the bare minimum is being cross-platform.
> Are there wrappers for things like dlopen()? posix_madvise?
Actually, yes, in a cross-platform way:
* http://www.boost.org/doc/libs/1_65_1/doc/html/boost_dll.html (does dlopen, dlclose, and so much more)
* http://www.boost.org/doc/libs/1_65_1/doc/html/boost/interpro... (advise() == posix_madvise if available)
> Filesystem ACLs ?
none that I know of :( though MS has a fairly decent "modern C++" API that covers WinRT: https://github.com/Microsoft/cppwinrt but I don't think ACLs are even available in WinRT
> COM
oh, yes: https://www.codeproject.com/Articles/5748/Introducing-Comet