capnproto: build shared libs, debuginfo, etc. (#391424)

{

  binutils,

  lib,

  stdenv,

  clangStdenv,

  fetchFromGitHub,

  cmake,

  openssl,

  zlib,

}:

stdenv.mkDerivation rec {

let

  # HACK: work around https://github.com/NixOS/nixpkgs/issues/177129

  # Though this is an issue between Clang and GCC,

  # so it may not get fixed anytime soon...

  empty-libgcc_eh = clangStdenv.mkDerivation {

    pname = "empty-libgcc_eh";

    version = "0";

    dontUnpack = true;

    installPhase = ''

      mkdir -p "$out"/lib

      "${binutils}"/bin/ar r "$out"/lib/libgcc_eh.a

    '';

  };

in

# NOTE: This must be `clang` because `gcc` is known to miscompile or ICE while

# compiling `capnproto` coroutines.

#

# See: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102051

# See: https://gerrit.lix.systems/c/lix/+/1874

clangStdenv.mkDerivation rec {

  pname = "capnproto";

  version = "1.1.0";

  propagatedBuildInputs = [

    openssl

    zlib

  ] ++ lib.optional (clangStdenv.cc.isClang && clangStdenv.targetPlatform.isStatic) empty-libgcc_eh;

  # FIXME: separate the binaries from the stuff that user systems actually use

  # This runs into a terrible UX issue in Lix and I just don't want to debug it

  # right now for the couple MB of closure size:

  # https://git.lix.systems/lix-project/lix/issues/551

  # outputs = [ "bin" "dev" "out" ];

  cmakeFlags = [

    (lib.cmakeBool "BUILD_SHARED_LIBS" true)

    # Take optimization flags from CXXFLAGS rather than cmake injecting them

    (lib.cmakeFeature "CMAKE_BUILD_TYPE" "None")

  ];

  env = {

    # Required to build the coroutine library

    CXXFLAGS = "-std=c++20";

  };

  separateDebugInfo = true;

  meta = with lib; {

    homepage = "https://capnproto.org/";

    description = "Cap'n Proto cerealization protocol";

    '';

    license = licenses.mit;

    platforms = platforms.all;

    maintainers = [ ];

    maintainers = lib.teams.lix.members;

  };

}