# Copyright (c) 2014-2017, Ruslan Baratov
# Copyright (c) 2017, David Hirvonen
# All rights reserved.

if(DEFINED POLLY_FLAGS_LTO_CMAKE_)
  return()
else()
  set(POLLY_FLAGS_LTO_CMAKE_ 1)
endif()

include(polly_add_cache_flag)

string(COMPARE EQUAL "${ANDROID_NDK_VERSION}" "" _not_android)

# TODO: test other platfroms, CMAKE_CXX_FLAGS_INIT should work for all
if(_not_android)
  polly_add_cache_flag(CMAKE_CXX_FLAGS "-flto")
  polly_add_cache_flag(CMAKE_C_FLAGS "-flto")
else()
  polly_add_cache_flag(CMAKE_CXX_FLAGS_INIT "-flto")
  polly_add_cache_flag(CMAKE_C_FLAGS_INIT "-flto")

  # SECTIONA
  polly_add_cache_flag(CMAKE_EXE_LINKER_FLAGS_INIT "-fuse-ld=gold")
  polly_add_cache_flag(CMAKE_SHARED_LINKER_FLAGS_INIT "-fuse-ld=gold")
  polly_add_cache_flag(CMAKE_EXE_LINKER_FLAGS_INIT "-flto")
  polly_add_cache_flag(CMAKE_SHARED_LINKER_FLAGS_INIT "-flto")

  # SECTIONB
  polly_add_cache_flag(CMAKE_EXE_LINKER_FLAGS_INIT "-Wl,-flto")
  polly_add_cache_flag(CMAKE_SHARED_LINKER_FLAGS_INIT "-Wl,-flto")
  polly_add_cache_flag(CMAKE_EXE_LINKER_FLAGS_INIT "-Wl,-fuse-ld=gold")
  polly_add_cache_flag(CMAKE_SHARED_LINKER_FLAGS_INIT "-Wl,-fuse-ld=gold")

  #polly_add_cache_flag(CMAKE_EXE_LINKER_FLAGS_INIT "-Wl,-fuse-linker-plugin")
  #polly_add_cache_flag(CMAKE_SHARED_LINKER_FLAGS_INIT "-Wl,-fuse-linker-plugin")

endif()

# There is no macro to detect this flags on toolchain calculation so we must
# mark this toolchain explicitly.
list(APPEND HUNTER_TOOLCHAIN_UNDETECTABLE_ID "lto")