CMakeLists.txt

cmake_minimum_required(VERSION 2.8.7)

include(inexor/functions.cmake)

### Different Configuration Types (Debug release)

# Only generate Debug and Release configuration types.
set(CMAKE_CONFIGURATION_TYPES Debug Release)

# First choice is Debug
if(NOT DEFINED CMAKE_BUILD_TYPE)
  set(CMAKE_BUILD_TYPE Debug CACHE INTERN "")
endif()

# Set a default toolchain file
message(STATUS "CMAKE_GENERATOR = ${CMAKE_GENERATOR}")

string(TOLOWER "${CMAKE_GENERATOR}" GEN)
if(GEN MATCHES ".*visual studio.*")
  set(CMAKE_TOOLCHAIN_FILE ${CMAKE_SOURCE_DIR}/inexor/platform/vs.cmake)
elseif(GEN MATCHES ".*mingw.*" OR MINGW)
  set(CMAKE_TOOLCHAIN_FILE ${CMAKE_SOURCE_DIR}/inexor/platform/mingw.cmake)
else()
  set(CMAKE_TOOLCHAIN_FILE ${CMAKE_SOURCE_DIR}/inexor/platform/linux.cmake)
endif()

message(STATUS "Using Toolchain File ${CMAKE_TOOLCHAIN_FILE}")

# Project Name
project(Inexor)

# Use folders in the resulting project files.
set_property(GLOBAL PROPERTY OS_FOLDERS ON)

# Warning if paths aren't set well
get_filename_component(MAINDIR "${CMAKE_SOURCE_DIR}" REALPATH)  # Main inexor folder
get_filename_component(BINDIR "${CMAKE_BINARY_DIR}" REALPATH)   # Where it generates the projects into

if(${MAINDIR} STREQUAL ${BINDIR})
    message(FATAL_ERROR "Keep your directories clean, don't generate the project-files in the main directory! ${MAINDIR} ${BINDIR}")
endif()

# Set the path to inexor/ explicitly to simplify some following definitions
set(SOURCE_DIR ${MAINDIR}/inexor)

### Platform Detection:

# Determine the project architecture.
if(NOT DEFINED PROJECT_ARCH)
  if(CMAKE_SIZEOF_VOID_P MATCHES 8)
    set(PROJECT_ARCH "x86_64")
    set(X64 1)
  else()
    set(PROJECT_ARCH "x86")
  endif()

  if(OS_MACOSX)
    # PROJECT_ARCH should be specified on Mac OS X.
    message(WARNING "No PROJECT_ARCH value specified, using ${PROJECT_ARCH}")
  endif()
endif()

# Determine the platform.
if("${CMAKE_SYSTEM_NAME}" STREQUAL "Darwin")
  set(OS_MACOSX 1)
  set(OS_POSIX 1)
  message(STATUS "Platform: OSX ${PROJECT_ARCH}")
elseif("${CMAKE_SYSTEM_NAME}" STREQUAL "Linux")
  set(OS_LINUX 1)
  set(OS_POSIX 1)
  message(STATUS "Platform: Linux ${PROJECT_ARCH}")
elseif("${CMAKE_SYSTEM_NAME}" STREQUAL "Windows")
  set(OS_WINDOWS 1)
  message(STATUS "Platform: Windows ${PROJECT_ARCH}")
endif()

# Allow C++ programs to use stdint.h macros specified in the C99 standard that
# aren't in the C++ standard (e.g. UINT8_MAX, INT64_MIN, etc).
add_definitions(-D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS)


### Platform-specific compiler/linker flags.

#
# Linux configuration. Or Cross Compilation for Windows
#
if(OS_LINUX OR (OS_WINDOWS AND NOT MSVC))
    set(I_LIBTYPE                 SHARED)
    # -fomit-frame-pointer            = Don't keep the frame pointer for functions that don't need one
    # -fno-strict-aliasing            = Avoid assumptions regarding non-aliasing of objects of different types
    # -fsigned-char                   = Let the type char be signed, like signed char.
    # -pipe                           = Use pipes rather than temporary files for communication between build stages
    # -Wall                           = Enable all warnings
    # -Wno-switch                     = Execpt Warnings for missing switch cases
    # -fdiagnostics-show-option       = Show Warning IDs
    set(I_COMPILER_FLAGS          "-fomit-frame-pointer -fno-strict-aliasing -fsigned-char -pipe -Wall -Wno-switch -fdiagnostics-show-option ")
    # -std=c99                        = Use the C99 language standard
    set(I_C_COMPILER_FLAGS        "-std=c99")
    # -fno-threadsafe-statics         = Don't generate thread-safe statics
    # -std=c++11                      = Use the C++11 language standard
    set(I_CXX_COMPILER_FLAGS      "-fno-threadsafe-statics -std=c++11")
    # -O0                             = No optimization
    # -g                              = Generate debug information
    # -D_DEBUG                        = Debug build
    set(I_COMPILER_FLAGS_DEBUG    "-O0 -g -D_DEBUG")
    # -O3                             = Optimize for maximum speed
    # -fdata-sections                 = Enable linker optimizations to improve locality of reference for data sections
    # -ffunction-sections             = Enable linker optimizations to improve locality of reference for function sections
    # -fno-ident                      = Ignore the #ident directive
    # -DNDEBUG                        = Not a debug build
    # -U_FORTIFY_SOURCE               = Undefine _FORTIFY_SOURCE in case it was previously defined
    # -D_FORTIFY_SOURCE=1             = Add memory and string function protection (security feature)
    set(I_COMPILER_FLAGS_RELEASE  "-O3 -fdata-sections -ffunction-sections -fno-ident -DNDEBUG -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=1")
    # -Wl,-rpath,.                    = Set rpath so that libraries can be placed next to the executable
    set(I_LINKER_FLAGS            "-Wl,-rpath,.")
    # -Wl,-O1                         = Enable linker optimizations
    # -Wl,--as-needed                 = Only link libraries that export symbols used by the binary
    # -Wl,--gc-sections               = Remove unused code resulting from -fdata-sections and -function-sections
    set(I_LINKER_FLAGS_RELEASE    "-Wl,-O1 -Wl,--as-needed -Wl,--gc-sections")

    if(X64)
        # 64-bit architecture.
        set(I_COMPILER_FLAGS        "${I_COMPILER_FLAGS} -m64 -march=x86-64")
        set(I_LINKER_FLAGS          "${I_LINKER_FLAGS} -m64")
    else()
        # 32-bit architecture.
        set(I_COMPILER_FLAGS        "${I_COMPILER_FLAGS} -msse2 -mfpmath=sse -mmmx -m32")
        set(I_LINKER_FLAGS          "${I_LINKER_FLAGS} -m32")
    endif()

    # Allow the Large File Support (LFS) interface to replace the old interface.
    add_definitions(-D_FILE_OFFSET_BITS=64)

    # Define where to move the binary by install
    set(EXE_SUB_DIR "bin/linux/${PROJECT_ARCH}")
endif()


#
# Mac OS X configuration.
#

if(OS_MACOSX)
    # See also SET_XCODE_TARGET_PROPERTIES in macros.cmake.
    set(I_LIBTYPE                 SHARED)
    # -fomit-frame-pointer            = Don't keep the frame pointer for functions that don't need one
    # -fno-strict-aliasing            = Avoid assumptions regarding non-aliasing of objects of different types
    # -funwind-tables                 = Support stack unwinding for backtrace()
    # -Wall                           = Enable all warnings
    set(I_COMPILER_FLAGS          "-fomit-frame-pointer -fno-strict-aliasing -funwind-tables -Wall")
    # -std=c99                        = Use the C99 language standard
    set(I_C_COMPILER_FLAGS        "-std=c99")
    # -fno-threadsafe-statics         = Don't generate thread-safe statics
    # -fobjc-call-cxx-cdtors          = Call the constructor/destructor of C++ instance variables in ObjC objects
    # -std=c++11                    = Use the C++11 language standard including
    # -Wno-narrowing                  = Don't warn about type narrowing
    # -Wsign-compare                  = Warn about mixed signed/unsigned type comparisons
    set(I_CXX_COMPILER_FLAGS      "-fno-threadsafe-statics -fobjc-call-cxx-cdtors -Wno-narrowing -Wsign-compare -std=c++11")
    # -O0                             = No optimization
    # -g                              = Generate debug information
    # -D_DEBUG                        = Debug build
    set(I_COMPILER_FLAGS_DEBUG    "-O0 -g -D_DEBUG")
    # -O3                             = Optimize for maximum speed plus a few extras
    set(I_COMPILER_FLAGS_RELEASE  "-O3")
    # -Wl,-search_paths_first         = Search for static or shared library versions in the same pass
    # -Wl,-ObjC                       = Support creation of creation of ObjC static libraries
    # -Wl,-pie                        = Generate position-independent code suitable for executables only
    set(I_LINKER_FLAGS            "-Wl,-search_paths_first -Wl,-ObjC -Wl,-pie")
    # -Wl,-dead_strip                 = Strip dead code
    set(I_LINKER_FLAGS_RELEASE    "-Wl,-dead_strip")

    # Standard libraries.
    set(I_STANDARD_LIBS "-framework Cocoa" "-framework AppKit")

    # Find the newest available base SDK.
    execute_process(COMMAND xcode-select --print-path OUTPUT_VARIABLE XCODE_PATH OUTPUT_STRIP_TRAILING_WHITESPACE)
    foreach(OS_VERSION 10.10 10.9 10.8 10.7)
        set(SDK "${XCODE_PATH}/Platforms/MacOSX.platform/Developer/SDKs/MacOSX${OS_VERSION}.sdk")
        if(NOT "${CMAKE_OSX_SYSROOT}" AND EXISTS "${SDK}" AND IS_DIRECTORY "${SDK}")
            set(CMAKE_OSX_SYSROOT ${SDK})
        endif()
    endforeach()

    # Target SDK.
    set(I_TARGET_SDK               "10.6")
    set(I_COMPILER_FLAGS           "${I_COMPILER_FLAGS} -mmacosx-version-min=${I_TARGET_SDK}")
    set(CMAKE_OSX_DEPLOYMENT_TARGET  ${I_TARGET_SDK})

    # Target architecture.
    if(X64)
        set(CMAKE_OSX_ARCHITECTURES "x86_64")
    else()
        set(CMAKE_OSX_ARCHITECTURES "i386")
    endif()

    # Define where to move the binary by install
    set(EXE_SUB_DIR "bin/mac/${CMAKE_OSX_ARCHITECTURES}")
endif()


#
# Windows configuration.
#

if(OS_WINDOWS)

    ## Cross compilation flags already set
    if(MSVC)
        set(I_LIBTYPE                 STATIC)
        # /MP                                   = Multiprocess compilation
        # /Gy                                   = Enable function-level linking
        # /Zi                                   = Enable program database
        # /fp:fast                              = Calculate with less precise floating point values
        # /EHsc                                 = assume extern C stuff never throws exceptions
        # /W2                                   = Warning level 2
        # /wd"4305"                             = Ignore "truncation from 'double' to 'float'" warning
        # /wd"4251"                             = Ignore "class 'type' needs to have dll-interface .." warning
        set(I_COMPILER_FLAGS          "-MP -Gy -Zi -fp:fast -EHsc -W2 -wd\"4305\" -wd\"4251\"")
        # /MTd                                  = Multithreaded debug runtime
        # /Od                                   = Disable optimizations
        # /RTC1                                 = Enable basic run-time checks
        # -D_DEBUG                              = Debug build
        set(I_COMPILER_FLAGS_DEBUG    "-MTd -RTC1 -Od -D_DEBUG")
        # /MT                                   = Multithreaded release runtime
        # /O2                                   = Optimize for maximum speed
        # /Ob2                                  = Inline any suitable function
        # /GF                                   = Enable string pooling
        # /D NDEBUG /D _NDEBUG                  = Not a debug build
        set(I_COMPILER_FLAGS_RELEASE  "-MT -O2 -Ob2 -GF -DNDEBUG -D_NDEBUG")
        # /DEBUG                                = Generate debug information
        set(I_LINKER_FLAGS_DEBUG      "-DEBUG")
        # /MANIFEST:NO                          = No default manifest
        # /SAFESEH:NO                           = Do Not Create a table of safe exception handlers (binary incompatible)
        set(I_EXE_LINKER_FLAGS        "-MANIFEST:NO -SAFESEH:NO ")
    endif()

    # Standard definitions
    # -DWIN32 -D_WIN32 -D_WINDOWS           = Windows platform
    # -DNOMINMAX                            = Use the standard's templated min/max
    # -D_WIN32_WINNT=0x0501                 = Target is Windows XP
    add_definitions(-DWIN32 -D_WIN32 -D_WINDOWS -DWINDOWS -DNOMINMAX -D_WIN32_WINNT=0x0501)
    if(X64)
        add_definitions(-DWIN64)
    endif()

    # Configure use of the sandbox.
    set(USE_SANDBOX OFF)
    if(MSVC_VERSION EQUAL 1800)
        # The I_sandbox.lib static library is currently built with VS2013. It will
        # not link successfully with other VS versions.
        set(USE_SANDBOX ON)
        option(USE_SANDBOX "Enable or disable use of the sandbox. (VS 2013 or later required)" ON)
    elseif(MSVC)
        message(WARNING "Use Visual Studio 2013 in order to compile Inexor. (Otherwise you would need to recompile the dependencies yourself)")
    endif()

    if(USE_SANDBOX)
        # Definition required by CEF_sandbox.lib.
        add_definitions(-DPSAPI_VERSION=1)
        # Definition used by apps to test if the sandbox is enabled.
        add_definitions(-DCEF_USE_SANDBOX)
    endif()

    # Rename project_arch from x86_64 to 64 and x86 to 32 on windows:
    if(X64)
        set(PROJECT_ARCH "64")
    else()
        set(PROJECT_ARCH "32")
    endif()

    # Define where to move the binary by install
    set(EXE_SUB_DIR "bin/windows/win${PROJECT_ARCH}")
endif()

# Ability to use your environment own cflags/ldflags.. as well
if(NOT MSVC)
    option( USE_ENVFLAGS "Enable or Disable Use of environment own Compiler/Linker-Flags" ON)

    if(USE_ENVFLAGS)
        set(I_C_COMPILER_FLAGS      "${I_C_COMPILER_FLAGS} $ENV{CFLAGS}")
        set(I_CXX_COMPILER_FLAGS    "${I_CXX_COMPILER_FLAGS} $ENV{CXXFLAGS}")
        set(I_LINKER_FLAGS          "${I_LINKER_FLAGS} $ENV{LDFLAGS}")
    endif()
endif()

# Merge compiler/linker flags.
set(CMAKE_C_FLAGS                     "${I_COMPILER_FLAGS} ${I_C_COMPILER_FLAGS}")
set(CMAKE_CXX_FLAGS                   "${I_COMPILER_FLAGS} ${I_CXX_COMPILER_FLAGS}")
set(CMAKE_CXX_FLAGS_DEBUG             "${I_COMPILER_FLAGS_DEBUG} ${I_CXX_COMPILER_FLAGS_DEBUG}")
set(CMAKE_CXX_FLAGS_RELEASE           "${I_COMPILER_FLAGS_RELEASE} ${I_CXX_COMPILER_FLAGS_RELEASE}")
set(CMAKE_EXE_LINKER_FLAGS            "${I_LINKER_FLAGS} ${I_EXE_LINKER_FLAGS}")
set(CMAKE_EXE_LINKER_FLAGS_DEBUG      "${I_LINKER_FLAGS_DEBUG} ${I_EXE_LINKER_FLAGS_DEBUG}")
set(CMAKE_EXE_LINKER_FLAGS_RELEASE    "${I_LINKER_FLAGS_RELEASE} ${I_EXE_LINKER_FLAGS_RELEASE}")

message(STATUS "Current mode:                   ${CMAKE_BUILD_TYPE}")
message(STATUS "Compiler:                       ${CMAKE_CXX_COMPILER_ID}")

message(STATUS "Compiler definitions:           ${DEFINITIONS}")

message(STATUS "C_FLAGS:                        ${CMAKE_C_FLAGS}")
message(STATUS "CXX_FLAGS:                      ${CMAKE_CXX_FLAGS}")
message(STATUS "CXX_FLAGS_DEBUG:                ${CMAKE_CXX_FLAGS_DEBUG}")
message(STATUS "CXX_FLAGS_RELEASE:              ${CMAKE_CXX_FLAGS_RELEASE}")
message(STATUS "EXE_LINKER_FLAGS:               ${CMAKE_EXE_LINKER_FLAGS}")
message(STATUS "EXE_LINKER_FLAGS_DEBUG:         ${CMAKE_EXE_LINKER_FLAGS_DEBUG}")
message(STATUS "EXE_LINKER_FLAGS_RELEASE:       ${CMAKE_EXE_LINKER_FLAGS_RELEASE}")

### Install paths

# Set output path for the compiled executable
set(EXE_DIR "${PROJECT_SOURCE_DIR}/${EXE_SUB_DIR}")

set(INSTALL_RESOURCES_DIR   ${BUILD_INSTALL_DIR}/resources  CACHE INTERNAL "")

message(STATUS "Generating Project-Files to ${CMAKE_CURRENT_BINARY_DIR}")
message(STATUS " - Resulting Executable goes to ${EXE_DIR}")

add_subdirectory(inexor)

install(FILES ${INSTALL_SHARED_LIBS} ${INSTALL_EXES} DESTINATION ${EXE_DIR})