feat: initialize modules setup w/ Nix

CMakeLists.txt

@@ -0,0 +1,11 @@
+cmake_minimum_required(VERSION 3.28)
+project(ModulesHelloWorld CXX)
+
+set(CMAKE_CXX_EXTENSIONS OFF)
+set(CMAKE_CXX_STANDARD 23)
+
+add_library(lib)
+target_sources(lib PUBLIC FILE_SET CXX_MODULES FILES lib.cxx)
+
+add_executable(hellomodules main.cxx)
+target_link_libraries(hellomodules lib)

CMakePresets.json

@@ -0,0 +1,21 @@
+{
+    "version": 6,
+    "cmakeMinimumRequired": {
+        "major": 3,
+        "minor": 28,
+        "patch": 0
+    },
+    "configurePresets": [
+        {
+            "name": "linux-default",
+            "displayName": "Debug",
+            "description": "Sets Ninja generator, compilers, build and install directory, debug build type",
+            "generator": "Ninja",
+            "binaryDir": "${sourceDir}/out/build/${presetName}",
+            "cacheVariables": {
+                "CMAKE_BUILD_TYPE": "Debug",
+                "CMAKE_INSTALL_PREFIX": "${sourceDir}/out/install/${presetName}"
+            }
+        }
+    ]
+}

flake.lock

@@ -0,0 +1,61 @@
+{
+  "nodes": {
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1726560853,
+        "narHash": "sha256-X6rJYSESBVr3hBoH0WbKE5KvhPU5bloyZ2L4K60/fPQ=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "c1dfcf08411b08f6b8615f7d8971a2bfa81d5e8a",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1728492678,
+        "narHash": "sha256-9UTxR8eukdg+XZeHgxW5hQA9fIKHsKCdOIUycTryeVw=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "5633bcff0c6162b9e4b5f1264264611e950c8ec7",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,51 @@
+{
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs = {
+    self,
+    nixpkgs,
+    flake-utils,
+  }:
+    flake-utils.lib.eachDefaultSystem (system: let
+      pkgs = nixpkgs.legacyPackages.${system};
+      inherit (pkgs.llvmPackages_19) stdenv;
+
+      gooey = stdenv.mkDerivation {
+        pname = "gooey";
+        version = "0.0.1";
+        # inherit system;
+
+        src = ./.;
+        buildInputs = [
+          pkgs.cmake
+          pkgs.ninja
+
+          (pkgs.callPackage ./nix/SDL3.nix {})
+          pkgs.llvmPackages_19.clang-tools
+        ];
+
+        configurePhase = ''
+          cmake -GNinja .
+        '';
+
+        buildPhase = ''
+          ninja
+        '';
+
+        installPhase = ''
+          mkdir -p $out/bin
+          mv gooey $out/bin
+        '';
+      };
+    in {
+      packages.default = gooey;
+      devShells.default = pkgs.mkShell {
+        name = "gooey";
+        inputsFrom = [gooey];
+        CMAKE_GENERATOR = "Ninja";
+      };
+    });
+}

lib.cxx

@@ -0,0 +1,21 @@
+// Global module fragment, where #includes can happen
+module;
+#include <iostream>
+
+export module lib;
+
+export class lib
+{
+public:
+    lib();
+    ~lib();
+    void helloworld();
+};
+
+lib::lib() = default;
+lib::~lib() = default;
+
+void lib::helloworld()
+{
+    std::cout << "Hello world!" << std::endl;
+}

main.cxx

@@ -0,0 +1,8 @@
+import lib;
+
+int main()
+{
+    lib lib{};
+    lib.helloworld();
+    return 0;
+}

nix/0001-cmake-use-FULL-install-directory-variants-in-pkg-con.patch

@@ -0,0 +1,30 @@
+From 1999109df34e67ed7c34d2b6b42f59feafc22bf1 Mon Sep 17 00:00:00 2001
+From: seth <getchoo@tuta.io>
+Date: Fri, 12 Jul 2024 21:59:14 -0400
+Subject: [PATCH] cmake: use `FULL` install directory variants in pkg-config
+ file
+
+Instead of manually prepending the install prefix to
+`CMAKE_INSTALL_<dir>` (which may already be an absolute path), we can
+let cmake do it for us
+---
+ cmake/sdl3.pc.in | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/cmake/sdl3.pc.in b/cmake/sdl3.pc.in
+index bfc2afffe..3724d6cf8 100644
+--- a/cmake/sdl3.pc.in
++++ b/cmake/sdl3.pc.in
+@@ -1,7 +1,7 @@
+ prefix=@SDL_PKGCONFIG_PREFIX@
+ exec_prefix=${prefix}
+-libdir=${prefix}/@CMAKE_INSTALL_LIBDIR@
+-includedir=${prefix}/@CMAKE_INSTALL_INCLUDEDIR@
++libdir=@CMAKE_INSTALL_FULL_LIBDIR@
++includedir=@CMAKE_INSTALL_FULL_INCLUDEDIR@
+ 
+ Name: sdl3
+ Description: Simple DirectMedia Layer is a cross-platform multimedia library designed to provide low level access to audio, keyboard, mouse, joystick, 3D hardware via OpenGL, and 2D video framebuffer.
+-- 
+2.45.2
+

nix/SDL3.nix

@@ -0,0 +1,95 @@
+{
+  lib,
+  stdenv,
+  fetchFromGitHub,
+  alsa-lib,
+  cmake,
+  darwin,
+  dbus,
+  fcitx5,
+  libdecor,
+  libdrm,
+  libjack2,
+  libpulseaudio,
+  libxkbcommon,
+  mesa,
+  nas,
+  ninja,
+  pipewire,
+  sndio,
+  systemdLibs,
+  testers,
+  validatePkgConfig,
+  wayland,
+  xorg,
+}:
+stdenv.mkDerivation (finalAttrs: {
+  pname = "sdl3";
+  version = "3.1.2-unstable-2024-08-01";
+
+  src = fetchFromGitHub {
+    owner = "libsdl-org";
+    repo = "SDL";
+    rev = "f01d4278c66e065e64bc934cd01e4f2952f613d7";
+    hash = "sha256-ok3ortmy5dm3zZdH+3tAvOIRDrDxDDXBjxBC3nGdHDM=";
+  };
+
+  patches = [
+    # Case of https://github.com/NixOS/nixpkgs/issues/144170
+    # Remove if/when https://github.com/libsdl-org/SDL/pull/10246 is merged
+    ./0001-cmake-use-FULL-install-directory-variants-in-pkg-con.patch
+  ];
+
+  outputs = [
+    "lib"
+    "dev"
+    "out"
+  ];
+
+  nativeBuildInputs = [
+    cmake
+    ninja
+    validatePkgConfig
+  ];
+
+  buildInputs =
+    lib.optionals stdenv.isLinux [
+      alsa-lib
+      dbus
+      fcitx5
+      libdecor
+      libdrm
+      libjack2
+      libpulseaudio
+      mesa # libgbm
+      nas # libaudo
+      pipewire
+      sndio
+      systemdLibs # libudev
+
+      # SDL_VIDEODRIVER=wayland
+      wayland
+
+      # SDL_VIDEODRIVER=x11
+      libxkbcommon
+      xorg.libX11
+      xorg.libXcursor
+      xorg.libXext
+      xorg.libXfixes
+      xorg.libXi
+      xorg.libXrandr
+    ]
+    ++ lib.optionals stdenv.isDarwin (with darwin.apple_sdk.frameworks; [ Cocoa ]);
+
+  passthru = {
+    tests.pkg-config = testers.hasPkgConfigModules { package = finalAttrs.finalPackage; };
+  };
+
+  meta = {
+    description = "Cross-platform development library (Pre-release version)";
+    homepage = "https://libsdl.org";
+    license = lib.licenses.zlib;
+    maintainers = with lib.maintainers; [ getchoo ];
+    pkgConfigModules = [ "sdl3" ];
+  };
+})