# Options

option(BUILD_SHARED_LIBS "Build shared libs" ON)
option(BUILD_DFT "libsleefdft will be built." ON)
option(BUILD_GNUABI_LIBS "libsleefgnuabi will be built." ON)
option(BUILD_TESTS "Tests will be built." ON)

option(SLEEF_TEST_ALL_IUT "Perform tests on implementations with all vector extensions" OFF)
option(SLEEF_SHOW_CONFIG "Show SLEEF configuration status messages." ON)
option(SLEEF_SHOW_ERROR_LOG "Show cmake error log." OFF)

# See doc/build-with-cmake.md for instructions on how to build Sleef.
cmake_minimum_required(VERSION 3.4.3)
# Set to NEW when updating cmake_minimum_required to VERSION >= 3.7.2
if(${CMAKE_VERSION} VERSION_GREATER "3.7.1")
  cmake_policy(SET CMP0066 OLD)
endif()

enable_testing()

set(SLEEF_VERSION_MAJOR 3)
set(SLEEF_VERSION_MINOR 3)
set(SLEEF_SOVERSION ${SLEEF_VERSION_MAJOR})

project(SLEEF
	VERSION ${SLEEF_VERSION_MAJOR}.${SLEEF_VERSION_MINOR}
	LANGUAGES C)

# Sanity check for in-source builds which we do not want to happen
if(CMAKE_SOURCE_DIR STREQUAL CMAKE_BINARY_DIR)
  message(FATAL_ERROR "SLEEF does not allow in-source builds.
You can refer to doc/build-with-cmake.md for instructions on how provide a \
separate build directory. Note: Please remove autogenerated file \
`CMakeCache.txt` and directory `CMakeFiles` in the current directory.")
endif()

# Set output directories for the library files
set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${PROJECT_BINARY_DIR}/lib)
set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${PROJECT_BINARY_DIR}/lib)
set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${PROJECT_BINARY_DIR}/bin)

foreach(CONFIG ${CMAKE_CONFIGURATION_TYPES})
  string(TOUPPER ${CONFIG} CONFIG)
  set(CMAKE_LIBRARY_OUTPUT_DIRECTORY_${CONFIG} ${PROJECT_BINARY_DIR}/lib)
  set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY_${CONFIG} ${PROJECT_BINARY_DIR}/lib)
  set(CMAKE_RUNTIME_OUTPUT_DIRECTORY_${CONFIG} ${PROJECT_BINARY_DIR}/bin)
endforeach(CONFIG CMAKE_CONFIGURATION_TYPES)

# Path for finding cmake modules
set(CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}/cmake/Modules)
set(SLEEF_SCRIPT_PATH ${CMAKE_CURRENT_SOURCE_DIR}/cmake/Scripts CACHE PATH
  "Path for finding sleef specific cmake scripts")

# sleef-config.h.in passes cmake settings to the source code
include(Configure.cmake)
configure_file(
  ${PROJECT_SOURCE_DIR}/sleef-config.h.in
  ${PROJECT_BINARY_DIR}/include/sleef-config.h @ONLY)

# We like to have a documented index of all targets in the project. The
# variables listed below carry the names of the targets defined throughout
# the project.

# Generates object file (shared library) `libsleef`
# Defined in src/libm/CMakeLists.txt via command add_library
set(TARGET_LIBSLEEF "sleef")
set(TARGET_LIBSLEEFGNUABI "sleefgnuabi")
# Generates the sleef.h headers and all the rename headers
# Defined in src/libm/CMakeLists.txt via custom commands and a custom target
set(TARGET_HEADERS "headers")
# Generates executable files for running the test suite
# Defined in src/libm-tester/CMakeLists.txt via command add_executable
set(TARGET_TESTER "tester")
set(TARGET_IUT "iut")
set(TARGET_IUTSSE2 "iutsse2")
set(TARGET_IUTSSE4 "iutsse4")
set(TARGET_IUTAVX "iutavx")
set(TARGET_IUTFMA4 "iutfma4")
set(TARGET_IUTAVX2 "iutavx2")
set(TARGET_IUTAVX2128 "iutavx2128")
set(TARGET_IUTAVX512F "iutavx512f")
set(TARGET_IUTADVSIMD "iutadvsimd")
set(TARGET_IUTNEON32 "iutneon32")
set(TARGET_IUTSVE "iutsve")
set(TARGET_IUTVSX "iutvsx")
# The target to generate LLVM bitcode only, available when SLEEF_ENABLE_LLVM_BITCODE is passed to cmake
set(TARGET_LLVM_BITCODE "llvm-bitcode")
# Generates the helper executable file mkrename needed to write the sleef header
set(TARGET_MKRENAME "mkrename")
set(TARGET_MKRENAME_GNUABI "mkrename_gnuabi")
set(TARGET_MKMASKED_GNUABI "mkmasked_gnuabi")
# Generates the helper executable file mkdisp needed to write the sleef header
set(TARGET_MKDISP "mkdisp")
set(TARGET_MKALIAS "mkalias")
# Generates static library common
# Defined in src/common/CMakeLists.txt via command add_library
set(TARGET_LIBCOMMON_OBJ "common")
set(TARGET_LIBARRAYMAP_OBJ "arraymap")

# Function used to add an executable that is executed on host
function(add_host_executable TARGETNAME)
  if (NOT CMAKE_CROSSCOMPILING)
    add_executable(${TARGETNAME} ${ARGN})
  else()
    add_executable(${TARGETNAME} IMPORTED)
    set_property(TARGET ${TARGETNAME} PROPERTY IMPORTED_LOCATION ${NATIVE_BUILD_DIR}/bin/${TARGETNAME})
  endif()
endfunction()

# Generates object file (shared library) `libsleefdft`
# Defined in src/dft/CMakeLists.txt via command add_library
set(TARGET_LIBDFT "sleefdft")

# Check subdirectories
add_subdirectory("src")

# Extra messages at configuration time. By default is active, it can be
# turned off by invoking cmake with "-DSLEEF_SHOW_CONFIG=OFF".
if(SLEEF_SHOW_CONFIG)
  message(STATUS "Configuring build for \
${PROJECT_NAME}-v${SLEEF_VERSION_MAJOR}.${SLEEF_VERSION_MINOR}")
  message("   Target system: ${CMAKE_SYSTEM}")
  message("   Target processor: ${CMAKE_SYSTEM_PROCESSOR}")
  message("   Host system: ${CMAKE_HOST_SYSTEM}")
  message("   Host processor: ${CMAKE_HOST_SYSTEM_PROCESSOR}")
  message("   Detected C compiler: ${CMAKE_C_COMPILER_ID} @ ${CMAKE_C_COMPILER}")
  if(CMAKE_CROSSCOMPILING)
    message("   Crosscompiling SLEEF.")
    message("   Native build dir: ${NATIVE_BUILD_DIR}")
  endif(CMAKE_CROSSCOMPILING)
  message(STATUS "Using option `${SLEEF_C_FLAGS}` to compile libsleef")
  message(STATUS "Building shared libs : " ${BUILD_SHARED_LIBS})
  message(STATUS "MPFR : " ${LIB_MPFR})
  if (MPFR_INCLUDE_DIR)
    message(STATUS "MPFR header file in " ${MPFR_INCLUDE_DIR})
  endif()
  message(STATUS "GMP : " ${LIBGMP})
  message(STATUS "RT : " ${LIBRT})
  message(STATUS "FFTW3 : " ${LIBFFTW3})
  message(STATUS "SDE : " ${SDE_COMMAND})
  message(STATUS "RUNNING_ON_TRAVIS : " ${RUNNING_ON_TRAVIS})
  message(STATUS "COMPILER_SUPPORTS_OPENMP : " ${COMPILER_SUPPORTS_OPENMP})
  if(ENABLE_GNUABI)
    message(STATUS "A version of SLEEF compatible  with libm and libmvec in GNU libc will be produced (${TARGET_LIBSLEEFGNUABI}.so)")
  endif()
  if (COMPILER_SUPPORTS_SVE)
    message(STATUS "Building SLEEF with VLA SVE support")
    if (ARMIE_COMMAND)
      message(STATUS "Arm Instruction Emulator found at ${ARMIE_COMMAND}")
      message(STATUS "SVE testing is done with ${SVE_VECTOR_BITS}-bits vectors.")
    endif()
  endif()
endif(SLEEF_SHOW_CONFIG)

if (MSVC)
  message("")
  message("*** Note: Parallel build is not supported on Microsoft Visual Studio")
endif()