Date: Fri, 29 Jun 2018 00:59:53 -0700 From: Eitan Adler <lists@eitanadler.com> To: "freebsd-arch@freebsd.org" <arch@freebsd.org>, David Chisnall <theraven@freebsd.org>, Justin Hibbits <jhibbits@freebsd.org>, Maxim Sobolev <sobomax@freebsd.org> Subject: C++ in the kernel? Message-ID: <CAF6rxgnBx66EhEfvw4GTetKbCsa%2B_OEPgYWXHF_6qQPcRrbWKQ@mail.gmail.com>
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This was the contents of a conversation on a different list. Figured it was more appropriate here: >> We are experimenting with a C++ library for systems programming and are = interested in trying it in the FreeBSD kernel. Has anyone managed to run C= ++ code in the kernel before and perhaps have patches to make the kernel he= aders somewhat less C++-hostile that they=E2=80=99d be willing to share? >> A friend gave a WIP talk at BSDCan a few years ago doing this very thing= . You can find his work at https://github.com/adamlsd/libcpp.ko >> I believe few times I've seen this discussion over the years the main co= ncerns raised were uncertainty about handling of exceptions and also lack o= f the real stable ABI for the C++. Each compiler seems to have its own conv= entions, which might vary even between compiler revisions. https://youtu.be= /JPQWQfDhICA?t=3D51m55s What might be possible, however, is to have particu= lar C++ "runtime" as a module itself, which is then would be used by the ot= her modules that are compiled with that particular C++ compiler. >> Most kernels that use C++ require -fno-rtti -fno-exceptions, so don=E2= =80=99t rely on a runtime. The ABI concerns were a problem 20 years ago, b= ut *NIX systems have kept the same C++ ABI since everyone[1] adopted the It= anium ABI. [1] Well, almost everyone. AArch32 has a slightly different AB= I, but it has also been stable for a similar length of time. >> Thanks, the include directory of that repo looks to be exactly what I ne= ed to get the subset of libc++ that I need working. --=20 Eitan Adler
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