V-Gears/CMakeLists.txt

# Minimum required CMake and project declaration
cmake_minimum_required(VERSION 3.5)
# Enable both C and CXX languages so C and C++ toolchains are configured.
project(V-Gears VERSION 0.3.0 LANGUAGES C CXX)

# Provide a central common include for project-wide policies and defaults.
list(APPEND CMAKE_MODULE_PATH "${CMAKE_SOURCE_DIR}/CMake")
include(ProjectCommon)

# Configure CMake options
option(USE_COTIRE "Enable cotire precompiled header support" ON)
option(BUILD_INSTALLER "Build the V-Gears-Installer" TRUE)
option(BUILD_TESTS "Build the unit tests" FALSE)
option(MULTITHREADING "Enable multithreading" TRUE)

# Hint for Qt configuration dirs. Setting this early helps subprojects locate
# Qt via config-mode packages when installs are in distro-specific locations.
# Example: -DQT_DIR_HINT=/usr/lib/x86_64-linux-gnu/cmake
set(QT_DIR_HINT "" CACHE PATH "Optional hint for Qt CMake config directory (parent of Qt5/Qt6)")
if(QT_DIR_HINT)
    list(APPEND CMAKE_PREFIX_PATH "${QT_DIR_HINT}")
    if(EXISTS "${QT_DIR_HINT}/Qt5")
        set(Qt5_DIR "${QT_DIR_HINT}/Qt5" CACHE PATH "Qt5 dir from hint" FORCE)
    elseif(EXISTS "${QT_DIR_HINT}/Qt5Core")
        set(Qt5_DIR "${QT_DIR_HINT}/Qt5Core" CACHE PATH "Qt5 dir from hint" FORCE)
    endif()
    if(EXISTS "${QT_DIR_HINT}/Qt6")
        set(Qt6_DIR "${QT_DIR_HINT}/Qt6" CACHE PATH "Qt6 dir from hint" FORCE)
    endif()
endif()

# Optionally enable cotire (precompiled header/speedup).
if(USE_COTIRE)
    include(cotire OPTIONAL RESULT_VARIABLE COTIRE_INCLUDE_RESULT)
    if(NOT COTIRE_INCLUDE_RESULT)
        message(WARNING "cotire requested but cotire.cmake not found in CMake modules; skipping")
    endif()
endif()
set(CMAKE_PACKAGE_ICON v-gears.png)

# Generate version header into the build tree so source tree is not modified.
set(VGEARS_VERSION ${PROJECT_VERSION})
set(VGEARS_VERSION_MAJOR ${PROJECT_VERSION_MAJOR})
set(VGEARS_VERSION_MINOR ${PROJECT_VERSION_MINOR})
set(VGEARS_VERSION_PATCH ${PROJECT_VERSION_PATCH})
configure_file(${CMAKE_CURRENT_SOURCE_DIR}/src/Version.h.in ${CMAKE_BINARY_DIR}/generated/Version.h @ONLY)
include_directories(${CMAKE_BINARY_DIR}/generated)

# Default build type when none is supplied by the caller.
if(NOT CMAKE_BUILD_TYPE)
    set(CMAKE_BUILD_TYPE "Release" CACHE STRING "Choose the type of build" FORCE)
endif()

# LuaJIT is a system dependency; sol2 is header-only.
find_package(PkgConfig QUIET)
if(PKG_CONFIG_FOUND)
    pkg_check_modules(LUAJIT QUIET luajit)
endif()

if(LUAJIT_FOUND)
    set(VGEARS_LUAJIT_INCLUDE_DIRS ${LUAJIT_INCLUDE_DIRS})
    set(VGEARS_LUAJIT_LIBRARIES ${LUAJIT_LINK_LIBRARIES})
else()
    find_path(VGEARS_LUAJIT_INCLUDE_DIR
        NAMES lua.hpp
        PATH_SUFFIXES luajit-2.1 luajit-2.0 luajit-5.1
    )
    find_library(VGEARS_LUAJIT_LIBRARY
        NAMES luajit-5.1 luajit-2.1 luajit
    )
    if(NOT VGEARS_LUAJIT_INCLUDE_DIR OR NOT VGEARS_LUAJIT_LIBRARY)
        message(FATAL_ERROR
            "LuaJIT development files were not found. Install libluajit-5.1-dev "
            "or set VGEARS_LUAJIT_INCLUDE_DIR and VGEARS_LUAJIT_LIBRARY."
        )
    endif()
    set(VGEARS_LUAJIT_INCLUDE_DIRS ${VGEARS_LUAJIT_INCLUDE_DIR})
    set(VGEARS_LUAJIT_LIBRARIES ${VGEARS_LUAJIT_LIBRARY})
endif()

# Build v-gears (and, if requested, the installer).
add_subdirectory(src)

# If requested, build tests
if(BUILD_TESTS)
    enable_testing()
    add_subdirectory(test)
endif()

# Install Linux desktop integration assets for the installer so desktop shells
# can map the running window to its icon.
if(UNIX AND NOT APPLE AND BUILD_INSTALLER)
    install(
        FILES ${CMAKE_SOURCE_DIR}/v-gears-installer.desktop
        DESTINATION share/applications
    )
    install(
        FILES ${CMAKE_SOURCE_DIR}/v-gears-installer.png
        DESTINATION share/icons/hicolor/256x256/apps
    )
    install(
        FILES ${CMAKE_SOURCE_DIR}/v-gears-installer.png
        DESTINATION share/pixmaps
    )
endif()

# TODO: Generate Installer (.msi, .deb, .appImage...)