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Added Nix build files #497

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Added Nix build files #497

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53 changes: 53 additions & 0 deletions default.nix
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Original file line number Diff line number Diff line change
@@ -0,0 +1,53 @@
{ pkgs ? import <nixpkgs> {}
, useLLVMLibcxx ? false
, ... }:

with pkgs;

pkgs.llvmPackages.stdenv.mkDerivation rec {
name = "xeus-cling";
src = ./.;

nativeBuildInputs = with pkgs; [
cmake
makeWrapper
];

buildInputs = with pkgs; [
xeus
xeus-zmq
cppzmq
cling.unwrapped
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The default cling package is meant for use by end-users directly, so it only provides the /bin/cling script which feeds arguments to the unwrapped version. See my comment on cxxFlags below for why it needs to be wrapped.

argparse
xtl
pugixml
nlohmann_json
openssl
llvmPackages_9.libllvm
llvmPackages_9.libclang
libuuid
];

# Runtime flags for the C++ standard library
cxxFlags = if useLLVMLibcxx then [
"-I" "${lib.getDev llvmPackages_9.libcxx}/include/c++/v1"
"-L" "${llvmPackages_9.libcxx}/lib"
"-l" "${llvmPackages_9.libcxx}/lib/libc++.so"
] else [
"-I" "${gcc-unwrapped}/include/c++/${gcc-unwrapped.version}"
"-I" "${gcc-unwrapped}/include/c++/${gcc-unwrapped.version}/x86_64-unknown-linux-gnu"
];

flags = [
"-nostdinc"
"-nostdinc++"
"-isystem" "${cling.unwrapped}/lib/clang/9.0.1/include"
] ++ cxxFlags ++ [
"-isystem" "${lib.getDev stdenv.cc.libc}/include"
"-isystem" "${cling.unwrapped}/include"
];
Comment on lines +32 to +48
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The funny thing about Nix is that it's optimized for prebuilt packages, meaning it stores dev outputs (headers, etc...) in a different path than default outputs (executables). This breaks the assumption that they exist at the same prefix, so we force xcpp to run with those flags set to our development paths.


fixupPhase = ''
wrapProgram $out/bin/xcpp --add-flags "$flags"
'';
}
26 changes: 26 additions & 0 deletions flake.lock
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9 changes: 9 additions & 0 deletions flake.nix
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Nix flakes are basically Nix packages which specify their inputs. The flake.lock file locks those inputs to a specific commit, allowing for reproducible builds.

Original file line number Diff line number Diff line change
@@ -0,0 +1,9 @@
{ description = "xeus-cling Jupyter kernel";

inputs."nixpkgs".url = github:NixOS/nixpkgs;

outputs = { self, nixpkgs, ... }:
{ packages.x86_64-linux.default =
(import nixpkgs { system="x86_64-linux"; }).callPackage ./default.nix {};
};
}