cmake_minimum_required(VERSION 3.5)
project(looking-glass-host C)

get_filename_component(PROJECT_TOP "${PROJECT_SOURCE_DIR}/.." ABSOLUTE)

if(PROJECT_SOURCE_DIR STREQUAL PROJECT_BINARY_DIR)
  message(FATAL_ERROR
    "\n"
    "In-source builds are not supported\n"
    "See build instructions provided in: "
    "${PROJECT_TOP}/doc/build.rst\n"
    "Refusing to continue"
  )
endif()

list(APPEND CMAKE_MODULE_PATH "${PROJECT_TOP}/cmake/" "${PROJECT_SOURCE_DIR}/cmake/")

set(CMAKE_C_FLAGS_RELWITHDEBINFO "-O3 -g -DNDEBUG" CACHE STRING "compiler flags" FORCE)
set(CMAKE_CXX_FLAGS_RELWITHDEBINFO "-O3 -g -DNDEBUG" CACHE STRING "compiler flags" FORCE)

include(CheckSubmodule)
include(GNUInstallDirs)
include(CheckCCompilerFlag)
include(FeatureSummary)

include(OptimizeForNative) # option(OPTIMIZE_FOR_NATIVE)
include(UninstallTarget)

option(ENABLE_BACKTRACE "Enable backtrace support on crash" ON)
add_feature_info(ENABLE_BACKTRACE ENABLE_BACKTRACE "Backtrace support.")

option(ENABLE_ASAN "Build with AddressSanitizer" OFF)
add_feature_info(ENABLE_ASAN ENABLE_ASAN "AddressSanitizer support.")

option(ENABLE_UBSAN "Build with UndefinedBehaviorSanitizer" OFF)
add_feature_info(ENABLE_UBSAN ENABLE_UBSAN "UndefinedBehaviorSanitizer support.")

add_compile_options(
  "-Wall"
  "-Werror"
  "-Wfatal-errors"
  "$<$<COMPILE_LANGUAGE:C>:-Wstrict-prototypes>"
  "-ffast-math"
  "-fdata-sections"
  "-ffunction-sections"
  "$<$<CONFIG:DEBUG>:-O0;-g3;-ggdb>"
)
set(CMAKE_C_STANDARD  11)

if(WIN32)
  add_compile_options("-fdebug-prefix-map=${PROJECT_TOP}/=")
  add_compile_definitions(__USE_MINGW_ANSI_STDIO=0)
endif()

if(ENABLE_ASAN)
  add_compile_options("-fno-omit-frame-pointer" "-fsanitize=address")
  set(EXE_FLAGS "${EXE_FLAGS} -fno-omit-frame-pointer -fsanitize=address")
endif()

if(ENABLE_UBSAN)
  add_compile_options("-fsanitize=undefined")
  set(EXE_FLAGS "${EXE_FLAGS} -fsanitize=undefined")
endif()

add_custom_command(
  OUTPUT  ${CMAKE_BINARY_DIR}/version.c
    ${CMAKE_BINARY_DIR}/include/version.h
    ${CMAKE_BINARY_DIR}/_version.c
  COMMAND ${CMAKE_COMMAND} -D PROJECT_TOP=${PROJECT_TOP} -P
    ${PROJECT_TOP}/version.cmake
)

include_directories(
  ${PROJECT_SOURCE_DIR}/include
  ${CMAKE_BINARY_DIR}/include
)

link_libraries(
  ${CMAKE_DL_LIBS}
)

if (ENABLE_ASAN OR ENABLE_UBSAN)
  link_directories("c:/msys64/clang64/lib/clang/12.0.0/lib/windows")
  link_libraries(clang_rt.asan_dynamic-x86_64 clang_rt.asan_dynamic_runtime_thunk-x86_64)
endif()


set(SOURCES
  ${CMAKE_BINARY_DIR}/version.c
  src/app.c
  src/downsample_parser.c
)

add_subdirectory("${PROJECT_TOP}/common"          "${CMAKE_BINARY_DIR}/common")
add_subdirectory("${PROJECT_TOP}/repos/LGMP/lgmp" "${CMAKE_BINARY_DIR}/lgmp"  )
add_subdirectory(platform)

if(WIN32)
  set_source_files_properties(platform/Windows/resource.rc PROPERTIES
    OBJECT_DEPENDS "${PROJECT_SOURCE_DIR}/platform/Windows/app.manifest;${PROJECT_TOP}/resources/icon.ico;${CMAKE_BINARY_DIR}/include/version.h"
  )
  add_executable(looking-glass-host WIN32
    platform/Windows/resource.rc
    ${SOURCES}
  )
else()
  add_executable(looking-glass-host ${SOURCES})
endif()
target_link_libraries(looking-glass-host
  lg_common
  platform
  lgmp
)

if(WIN32)
  set_target_properties(looking-glass-host PROPERTIES LINK_FLAGS "-Wl,--gc-sections -Wl,--nxcompat")
else()
  set_target_properties(looking-glass-host PROPERTIES LINK_FLAGS "-Wl,--gc-sections -z noexecstack")
endif()

install(TARGETS looking-glass-host
  RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
  COMPONENT binary)

feature_summary(WHAT ENABLED_FEATURES DISABLED_FEATURES)