Merge pull request 'Update template' (#1) from cmake into master

Reviewed-on: cspark/CPP-on-NixOS#1

.gitignore

@@ -1,2 +1,3 @@
+build/
 .cache/
-a.out
+.ccls-cache/

CMakeLists.txt

@@ -0,0 +1,16 @@
+cmake_minimum_required(VERSION 3.23)
+
+project(template)
+
+set(CMAKE_CXX_STANDARD 23)
+set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
+
+#string(REPLACE ":" ";" INCLUDE_LIST $ENV{CMAKE_STDLIB})
+#include_directories($ENV{CMAKE_STDLIB})
+
+add_executable(template)
+
+target_sources(template
+	PRIVATE
+		main.cpp
+)

README.org

@@ -1,16 +1,2 @@
-* NixOS C++ Dev Template
-Having issues getting clangd to detect std header files despite clang++ and g++ having no issues. So this template/workaround solves this.
-
-I assume this is due to some wrapper script nonsense.
-
-As a workaround I use bear to generate the necessary paths/arguments to get clangd to pick these up.
-
-#+BEGIN_SRC
-bear -- clang++ main.cpp
-#+END_SRC
-
-In the generated compile_commands.json. There is a command for generating the main project but also a temporary object file.
-
-I assume this is more weird wrapper stuff (Bear does not support nixos clang wrappers)
-
-You need to move the cxx_isystem related flags as these are where the c++ stdlibs are kept. Also just rename them to isystem otherwise they dont work for whatever reason.
+* Nix C++ Dev Template
+Basic C++ CMake template with Nix

compile_commands.json

@@ -1,20 +0,0 @@
-[
-  {
-    "arguments": [
-      "/run/current-system/sw/bin/clang++",
-      "-std=c++23",
-      "-resource-dir",
-      "/nix/store/k2s6xfca52n25yb8b6f58i87kszp3m7g-clang-wrapper-21.1.2/resource-root",
-      "-idirafter",
-      "/nix/store/dqgfdpr53ldqmdfmginb1z6kzslkzsdl-glibc-2.40-66-dev/include",
-      "-isystem",
-      "/nix/store/68ndh04pl2hhhizsarvzwa9cnlp7zj3d-gcc-14.3.0/include/c++/14.3.0",
-      "-isystem",
-      "/nix/store/68ndh04pl2hhhizsarvzwa9cnlp7zj3d-gcc-14.3.0/include/c++/14.3.0/x86_64-unknown-linux-gnu",
-      "-c",
-      "main.cpp"
-    ],
-    "directory": "/home/cspark/Projects/CPP/hello_world",
-    "file": "/home/cspark/Projects/CPP/hello_world/main.cpp"
-  }
-]

compile_commands.json

@@ -0,0 +1 @@
+build/compile_commands.json

default.nix

@@ -0,0 +1,14 @@
+with (import <nixpkgs> {});
+
+clangStdenv.mkDerivation {
+	name = "template";
+	nativeBuildInputs = with pkgs; [
+		cmake
+
+		clang-tools
+		clang
+	];
+
+	# Workaround as Clangd cannot see std header files, so include set of files manually just for Clangd
+	CXXFLAGS = "-isystem${pkgs.gcc.cc}/include/c++/14.3.0 -isystem${pkgs.gcc.cc}/include/c++/14.3.0/x86_64-unknown-linux-gnu -isystem${pkgs.glibc.dev}/include";
+}

main.cpp

@@ -1,6 +1,6 @@
 #include <iostream>
-#include <print>
 
 int main() {
-	std::println("Hello, world!");
+	std::cout << "Hello, world!" << std::endl;
 }
+

run.sh

@@ -1,7 +1,7 @@
 #!/bin/sh
 
-rm a.out
+cmake -B build --fresh
 
-clang++ -std=c++23 main.cpp
+cmake --build build
 
-./a.out
+./build/discern