cmake_minimum_required(VERSION 3.21)
project(Engine)

# set output directories
set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/lib/static)
set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/lib)
set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)

# configure C11
set(CMAKE_C_STANDARD 11)          # request C11
set(CMAKE_C_STANDARD_REQUIRED ON) # enforce requested standard
set(CMAKE_C_EXTENSIONS OFF)       # disable compiler specific extensions

# configure C++17
set(CMAKE_CXX_STANDARD 17)          # request C++17
set(CMAKE_CXX_STANDARD_REQUIRED ON) # enforce requested standard
set(CMAKE_CXX_EXTENSIONS OFF)       # disable compiler specific extensions

# helper function to simplify definition of projects
function(target name)
    file(GLOB_RECURSE SRC "${name}/*")   # recursively collect all files in sub-folder for project
    add_executable(${name} ${SRC})       # define project "name" based on files found in SRC

    #set required warning flags
    if("${CMAKE_C_COMPILER_ID}" STREQUAL "GNU"   OR "${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU" OR
            "${CMAKE_C_COMPILER_ID}" STREQUAL "Clang" OR "${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
        target_compile_options(${name} PRIVATE
                -Wall        # enable "all" warnings
                -Wextra      # enable extra warnings
                -Wpedantic   # enable strict conformance warnings
                -Wconversion # enable warnings for dangerous implicit conversions
                -Werror=vla  # disable support for VLAs
                )
        target_link_libraries(${name} PRIVATE
                m # math library must be explicitly linked on Unix
                )
    elseif("${CMAKE_C_COMPILER_ID}" STREQUAL "MSVC" OR "${CMAKE_CXX_COMPILER_ID}" STREQUAL "MSVC")
        target_compile_options(${name} PRIVATE
                /W4          # enable almost all "necessary" warnings
                /permissive- # enforce strict standard compliance
                /JMC         # optimize debugging experience
                /MP          # enable parallel compilation
                )
    else()
        message(WARNING "unknown compiler, no warning flags set!")
    endif()
endfunction()

target(Engine) # Foldername of the source code