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lix/misc/capnproto.nix
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Raito Bezariusandeldritch horrors 3f3060ebed misc/capnproto: patch to avoid monotonic time checks
From time to time, our KVM's CI machine clock goes in a weird direction
during NixOS tests, this is known on certain hardware, e.g. macOS, where
the check is disabled. Cap'n'Proto removed the check everywhere now.

Fixes fj#754.

We can remove the patch once it hits a stable version of Cap'n'Proto.

Change-Id: I4c9be5061c3b244f601486a8ac4521dff44ceb92
Signed-off-by: Raito Bezarius <raito@lix.systems>
2025-05-09 14:17:35 +02:00

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# FIXME: upstream to nixpkgs (do NOT build with gcc due to gcc coroutine bugs)
{
binutils,
lib,
stdenv,
fetchFromGitHub,
cmake,
openssl,
zlib,
}:
assert stdenv.cc.isClang;
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 = stdenv.mkDerivation {
pname = "empty-libgcc_eh";
version = "0";
dontUnpack = true;
installPhase = ''
mkdir -p "$out"/lib
"${binutils}"/bin/ar r "$out"/lib/libgcc_eh.a
'';
};
in
stdenv.mkDerivation rec {
pname = "capnproto";
version = "1.0.2";
# release tarballs are missing some ekam rules
src = fetchFromGitHub {
owner = "capnproto";
repo = "capnproto";
rev = "v${version}";
sha256 = "sha256-LVdkqVBTeh8JZ1McdVNtRcnFVwEJRNjt0JV2l7RkuO8=";
};
patches = [
# backport of https://github.com/capnproto/capnproto/pull/1810
./capnproto-promise-nodiscard.patch
# backport of https://github.com/capnproto/capnproto/pull/2296
./capnproto-monotonic-clocks-are-a-lie.patch
];
nativeBuildInputs = [ cmake ];
propagatedBuildInputs = [
openssl
zlib
] ++ lib.optional (stdenv.cc.isClang && stdenv.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";
longDescription = ''
Capn Proto is an insanely fast data interchange format and
capability-based RPC system. Think JSON, except binary. Or think Protocol
Buffers, except faster.
'';
license = licenses.mit;
platforms = platforms.all;
maintainers = lib.teams.lix.members;
};
}