🎉 init(cmake): init modern cmake template

CMakeLists.txt

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+# Works with 3.14 and tested through 3.29
+cmake_minimum_required(VERSION 3.14...3.29)
+
+# Project name and a few useful settings. Other commands can pick up the results
+project(
+  ModernCMakeExample
+  VERSION 0.1
+  DESCRIPTION "An example project with CMake"
+  LANGUAGES CXX)
+
+# Only do these if this is the main project, and not if it is included through add_subdirectory
+if(CMAKE_PROJECT_NAME STREQUAL PROJECT_NAME)
+
+  # Optionally set things like CMAKE_CXX_STANDARD, CMAKE_POSITION_INDEPENDENT_CODE here
+  set(CMAKE_CXX_STANDARD 17)
+  # set(CMAKE_CXX_STANDARD_REQUIRED 17)
+  set(default_build_type "Release")
+  if(NOT CMAKE_BUILD_TYPE AND NOT CMAKE_CONFIGURATION_TYPES)
+    message(STATUS "Setting build type to '${default_build_type}' as none was specified.")
+    set(CMAKE_BUILD_TYPE "${default_build_type}" CACHE
+        STRING "Choose the type of build." FORCE)
+    # Set the possible values of build type for cmake-gui
+    set_property(CACHE CMAKE_BUILD_TYPE PROPERTY STRINGS
+      "Debug" "Release" "MinSizeRel" "RelWithDebInfo")
+  endif()
+
+  set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
+
+  # Let's ensure -std=c++xx instead of -std=g++xx
+  set(CMAKE_CXX_EXTENSIONS OFF)
+
+  # Let's nicely support folders in IDEs
+  set_property(GLOBAL PROPERTY USE_FOLDERS ON)
+
+  # Testing only available if this is the main app
+  # Note this needs to be done in the main CMakeLists
+  # since it calls enable_testing, which must be in the
+  # main CMakeLists.
+  include(CTest)
+
+  # Docs only available if this is the main app
+  find_package(Doxygen)
+  if(Doxygen_FOUND)
+    add_subdirectory(docs)
+  else()
+    message(STATUS "Doxygen not found, not building docs")
+  endif()
+endif()
+
+# FetchContent added in CMake 3.11, downloads during the configure step
+# FetchContent_MakeAvailable was added in CMake 3.14; simpler usage
+include(FetchContent)
+
+# Accumulator library
+# This is header only, so could be replaced with git submodules or FetchContent
+find_package(Boost REQUIRED)
+# Adds Boost::boost
+
+# Formatting library
+FetchContent_Declare(
+  fmtlib
+  GIT_REPOSITORY https://github.com/fmtlib/fmt.git
+  GIT_TAG 5.3.0)
+FetchContent_MakeAvailable(fmtlib)
+# Adds fmt::fmt
+
+# The compiled library code is here
+add_subdirectory(src)
+
+# The executable code is here
+add_subdirectory(apps)
+
+# Testing only available if this is the main app
+# Emergency override MODERN_CMAKE_BUILD_TESTING provided as well
+if((CMAKE_PROJECT_NAME STREQUAL PROJECT_NAME OR MODERN_CMAKE_BUILD_TESTING)
+   AND BUILD_TESTING)
+  add_subdirectory(tests)
+endif()