fortuna/CMakeLists.txt

cmake_minimum_required(VERSION 3.20)
message(STATUS "CMake version: ${CMAKE_VERSION}")

project(fortuna LANGUAGES CXX)

set(CMAKE_CXX_STANDARD 20)
set(CMAKE_CXX_STANDARD_REQUIRED ON)

find_package(Git QUIET)
if(GIT_FOUND AND EXISTS "${PROJECT_SOURCE_DIR}/.git")
  option(GIT_SUBMODULE "Check submodules during build" ON)
  if(GIT_SUBMODULE)
    message(STATUS "Update submodule(s)")
    message(STATUS "Current source dir: ${CMAKE_CURRENT_SOURCE_DIR}")
    execute_process(COMMAND ${GIT_EXECUTABLE} submodule update --init --recursive
                    WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
                    RESULT_VARIABLE GIT_SUBMOD_RESULT)
    if(NOT GIT_SUBMOD_RESULT EQUAL "0")
      message(FATAL_ERROR "git submodule update --init --recursive failed with ${GIT_SUBMOD_RESULT}, please checkout submodules")
    endif()
  endif()
endif()

add_subdirectory(lib/fmt EXCLUDE_FROM_ALL)

  if(NOT CMAKE_CXX_FLAGS MATCHES "-Wall")
    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall")
  endif(NOT CMAKE_CXX_FLAGS MATCHES "-Wall")

  if(CMAKE_BUILD_TYPE MATCHES "Debug")

    if($ENV{TIDY} MATCHES "1")
      message(STATUS "TIDY=1, running clang-tidy")
      set(CMAKE_CXX_CLANG_TIDY clang-tidy -p ${CMAKE_CURRENT_BINARY_DIR} --checks=-*,clang-diagnostic-*,clang-analyzer-*,google-*,bugprone-* --header-filter= --use-color=true)
      message(STATUS "CMAKE_CXX_CLANG_TIDY: ${CMAKE_CXX_CLANG_TIDY}")
    endif()


    # Produce debugging information in the operating system's native format.
    # Level 3 includes extra information, such as all the macro definitions
    # present in the program. Some debuggers support macro expansion when you
    # use -g3
    if(NOT CMAKE_CXX_FLAGS MATCHES "-g")
      set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -g3")
    endif(NOT CMAKE_CXX_FLAGS MATCHES "-g")

    # Optimize debugging experience. -Og should be the optimization level of
    # choice for the standard edit-compile-debug cycle, offering a reasonable
    # level of optimization while maintaining fast compilation and a good
    # debugging experience. It is a better choice than -O0 for producing
    # debuggable code because some compiler passes that collect debug
    # information are disabled at -O0.
    if(NOT CMAKE_CXX_FLAGS MATCHES "-Og")
      set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Og")
    endif(NOT CMAKE_CXX_FLAGS MATCHES "-Og")

    if(NOT $ENV{VALGRIND} MATCHES "true")
      if($ENV{SANITIZE_PLS} MATCHES "true")
        # this needs {libasan,liblsan,libubsan} on fedora, gcc-libs on arch
        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fsanitize=address")
        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fsanitize=leak") # issue with gdb
        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fno-omit-frame-pointer")
        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fsanitize=pointer-compare")
        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fsanitize=pointer-subtract")
        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fsanitize=vla-bound")
        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fsanitize-address-use-after-scope")
        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fstack-clash-protection")
        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fno-omit-frame-pointer")
        # clang-only atm
        # set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fsanitize=safe-stack")
        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fsanitize=undefined")
        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fsanitize=bounds")
        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fsanitize=vptr")
        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fsanitize=pointer-overflow")
        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fsanitize=enum")
        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fsanitize=signed-integer-overflow")
        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fsanitize=null")
        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fsanitize=return")
        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fsanitize=integer-divide-by-zero")
        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fsanitize=float-cast-overflow")
        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fsanitize=unreachable")
        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fsanitize=alignment")
        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fsanitize=object-size")
      endif($ENV{SANITIZE_PLS} MATCHES "true")


      # If DWARF debugging information is enabled, separate as much debugging
      # information as possible into a separate output file with the extension
      # .dwo. This option allows the build system to avoid linking files with
      # debug information.
      if(NOT CMAKE_CXX_FLAGS MATCHES "-gsplit-dwarf")
        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -gsplit-dwarf")
      endif(NOT CMAKE_CXX_FLAGS MATCHES "-gsplit-dwarf")
    else()
      message(STATUS "VALGRIND=true, not setting '-gsplit-dwarf'")
    endif(NOT $ENV{VALGRIND} MATCHES "true")

    if(NOT CMAKE_CXX_FLAGS MATCHES "-Wextra")
      set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wextra")
    endif(NOT CMAKE_CXX_FLAGS MATCHES "-Wextra")

    if(NOT CMAKE_CXX_FLAGS MATCHES "-Wpedantic")
      set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wpedantic")
    endif(NOT CMAKE_CXX_FLAGS MATCHES "-Wpedantic")

  endif(CMAKE_BUILD_TYPE MATCHES "Debug")

  if(CMAKE_BUILD_TYPE MATCHES "Release")

    # Optimize yet more.
    if(NOT CMAKE_CXX_FLAGS MATCHES "-O3")
      set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -O3")
    endif(NOT CMAKE_CXX_FLAGS MATCHES "-O3")

    if(NOT CMAKE_CXX_FLAGS MATCHES "-DNDEBUG")
      set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -DNDEBUG")
    endif(NOT CMAKE_CXX_FLAGS MATCHES "-DNDEBUG")

    if(NOT CMAKE_CXX_FLAGS MATCHES "-fstack-protector-all")
      set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fstack-protector-all")
    endif(NOT CMAKE_CXX_FLAGS MATCHES "-fstack-protector-all")

    if(NOT CMAKE_CXX_FLAGS MATCHES "-fdelete-null-pointer-checks")
      set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fdelete-null-pointer-checks")
    endif(NOT CMAKE_CXX_FLAGS MATCHES "-fdelete-null-pointer-checks")

    if(NOT CMAKE_CXX_FLAGS MATCHES "-fisolate-erroneous-paths-dereference")
      set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fisolate-erroneous-paths-dereference")
    endif(NOT CMAKE_CXX_FLAGS MATCHES "-fisolate-erroneous-paths-dereference")

    if(NOT CMAKE_CXX_FLAGS MATCHES "-ftree-loop-if-convert")
      set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -ftree-loop-if-convert")
    endif(NOT CMAKE_CXX_FLAGS MATCHES "-ftree-loop-if-convert")

    if(NOT CMAKE_CXX_FLAGS MATCHES "-funwind-tables")
      set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -funwind-tables")
    endif(NOT CMAKE_CXX_FLAGS MATCHES "-funwind-tables")

    if(NOT CMAKE_CXX_FLAGS MATCHES "-fasynchronous-unwind-tables")
      set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fasynchronous-unwind-tables")
    endif(NOT CMAKE_CXX_FLAGS MATCHES "-fasynchronous-unwind-tables")

    if(NOT CMAKE_CXX_FLAGS MATCHES "-Wp,-D_FORTIFY_SOURCE=2")
        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wp,-D_FORTIFY_SOURCE=2")
    endif(NOT CMAKE_CXX_FLAGS MATCHES "-Wp,-D_FORTIFY_SOURCE=2")
  endif(CMAKE_BUILD_TYPE MATCHES "Release")

  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fsplit-stack")
  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wformat -Wformat-security")

  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -march=native -mtune=generic -pipe -fno-plt")
  if(NOT CMAKE_CXX_FLAGS MATCHES "-fPIC")
    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fPIC")
  endif(NOT CMAKE_CXX_FLAGS MATCHES "-fPIC")
  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fPIE -pie")

  if(CMAKE_BUILD_TYPE MATCHES "Debug")
    set(LDFLAGS "${LDFLAGS} -Wl,-Og,–sort-common,–as-needed,-z,now,-pic,-pie")
  elseif(CMAKE_BUILD_TYPE MATCHES "Release")
    set(LDFLAGS "${LDFLAGS} -Wl,-O1,–sort-common,–as-needed,-z,relro,-z,now,-pic,-pie,-flto")
  endif()

  # inspired by https://medium.com/@alasher/colored-c-compiler-output-with-ninja-clang-gcc-10bfe7f2b949
  option (COLORS_FOREVER "Always produce ANSI-colored output (GNU/Clang only)." TRUE)
  if (${COLORS_FOREVER})
      message(STATUS "COLORS_FOREVER: ${COLORS_FOREVER}")
    if ("${CMAKE_CXX_COMPILER_ID}" MATCHES "GNU")
      add_compile_options (-fdiagnostics-color=always)
    elseif ("${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang")
      add_compile_options (-fcolor-diagnostics)
    endif ()
  endif ()

  message(STATUS "Compiler ID: ${CMAKE_CXX_COMPILER_ID}")
  message(STATUS "CMAKE_CXX_FLAGS: ${CMAKE_CXX_FLAGS}")
  message(STATUS "LDFLAGS: ${LDFLAGS}")

  find_program(LLD lld)
  if(LLD)
    if(NOT CMAKE_EXE_LINKER_FLAGS MATCHES "-fuse-ld=lld")
      message(STATUS "Linker: lld: ${LLD}")
      set (CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -fuse-ld=lld")
    endif(NOT CMAKE_EXE_LINKER_FLAGS MATCHES "-fuse-ld=lld")
  endif()

add_executable(fortuna main.cpp generator.cpp generator.h fortuna.cpp fortuna.h accumulator.cpp accumulator.h pool.cpp pool.h event_adder.h event_adder_impl.h)
# ref: https://cmake.org/pipermail/cmake/2016-May/063400.html
target_link_libraries(fortuna
    PRIVATE cryptopp
    PRIVATE fmt::fmt-header-only)