set(histv7_standalone TRUE)

include(GNUInstallDirs)
include(headers.cmake)

# Turn relative paths to header files into absolute ones.
list(TRANSFORM histv7_headers PREPEND ${CMAKE_CURRENT_SOURCE_DIR}/inc/)

add_library(ROOTHist INTERFACE)
target_include_directories(ROOTHist INTERFACE
  $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/inc>
  $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>)
target_compile_features(ROOTHist INTERFACE cxx_std_17)

# Install header files manually: PUBLIC_HEADER has the disadvantage that CMake
# flattens the directory structure on install, and FILE_SETs are only available
# with CMake v3.23.
install(FILES ${histv7_headers} DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/ROOT)

include(CTest)
if(BUILD_TESTING)
  find_package(GTest)
  if(GTEST_FOUND)
    # Function used in test/ to add unitest executables.
    function(HIST_ADD_GTEST name source)
      add_executable(${name} ${source})
      target_link_libraries(${name} ROOTHist GTest::Main)
      add_test(NAME ${name} COMMAND ${name})
    endfunction()

    add_subdirectory(test)
  else()
    message(WARNING "GTest not found, disabling tests")
  endif()
endif()

option(histv7_benchmark "Build the benchmarks." OFF)
if(histv7_benchmark)
  find_package(benchmark CONFIG REQUIRED)
  add_subdirectory(benchmark)
endif()