Neeraj neeraj9

Effective Modern CMake

Getting Started

For a brief user-level introduction to CMake, watch C++ Weekly, Episode 78, Intro to CMake by Jason Turner. LLVM’s CMake Primer provides a good high-level introduction to the CMake syntax. Go read it now.

After that, watch Mathieu Ropert’s CppCon 2017 talk Using Modern CMake Patterns to Enforce a Good Modular Design (slides). It provides a thorough explanation of what modern CMake is and why it is so much better than “old school” CMake. The modular design ideas in this talk are based on the book [Large-Scale C++ Software Design](https://www.amazon.de/Large-Scale-Soft

	# Building open source software from source code is always interesting
	# although time consuming at times.

	# Make sure that your system has CMake, Ninja, GCC (c, c++) compiler, Python 3 installed.
	# see https://github.com/ziglang/zig-bootstrap#host-system-dependencies

	cd $HOME
	mkdir ziglang
	cd ziglang

	# see https://github.com/carbon-language/carbon-lang#getting-started

	mkdir carbon-language
	cd carbon-language
	git clone https://github.com/carbon-language/carbon-lang
	bazel run //explorer -- ./explorer/testdata/print/format_only.carbon

	const std = @import("std");

	pub fn main() !void {
	var buf: [std.fs.MAX_PATH_BYTES]u8 = undefined;
	const cwd = std.os.getcwd(&buf) catch \|err\| {
	std.debug.print("> [error] detecting current working directory, err={}\n", .{err});
	return;
	};

	var gpa = std.heap.GeneralPurposeAllocator(.{}){};

	project('myapp', 'cpp',
	default_options : ['cpp_std=c++20', 'warning_level=2'])

	main_target_name = 'myapp'
	sources = ['src/main.cpp', 'src/common.cpp']
	hdrs = include_directories('include')

	executable(main_target_name, sources,
	include_directories : hdrs,
	install : true)

	# see https://github.com/ziglang/zig-bootstrap#host-system-dependencies
	sudo apt install build-essential cmake ninja-build make python3

	# see https://github.com/carbon-language/carbon-lang#getting-started

	sudo apt install build-essential bazel-bootstrap llvm