CMakeLists.txt

cmake_minimum_required(VERSION 2.8)

# Change the compiler BEFORE the first `project()` command to avoid an infinite loop.
# See: https://public.kitware.com/pipermail/cmake/2009-November/033133.html
if(APPLE)
  # If custom llvm compilers are available, use them (for openmp
  # support), otherwise disable multicore.
  if(EXISTS "/usr/local/opt/llvm/bin/clang")
    set(CMAKE_C_COMPILER "/usr/local/opt/llvm/bin/clang")
    set(CMAKE_CXX_COMPILER "/usr/local/opt/llvm/bin/clang++")
  endif()
endif()

project (libff)

# Versionning of the project
set(LIBFF_VERSION_MAJOR 0)
set(LIBFF_VERSION_MINOR 1)

# Default to RelWithDebInfo configuration if no configuration is explicitly specified.
if(NOT CMAKE_BUILD_TYPE AND NOT CMAKE_CONFIGURATION_TYPES)
  set(CMAKE_BUILD_TYPE RelWithDebInfo CACHE STRING "Build type on single-configuration generators" FORCE)
endif()

set(
  CURVE
  "BN128"
  CACHE
  STRING
  "Default curve: one of ALT_BN128, BN128, EDWARDS, MNT4, MNT6, BLS12_377, BLS12_381, BW6_761"
)

option(
  DEBUG
  "Enable debugging mode"
  OFF
)
option(
  LOWMEM
  "Limit the size of multi-exponentiation tables, for low-memory platforms"
  OFF
)
option(
  MULTICORE
  "Enable parallelized execution, using OpenMP"
  ON
)
option(
  BINARY_OUTPUT
  "In serialization, output raw binary data (instead of decimal), which is smaller and faster."
  ON
)
option(
  MONTGOMERY_OUTPUT
  "Serialize Fp elements as their Montgomery representations (faster but not human-readable)"
  ON
)
option(
  USE_PT_COMPRESSION
  "Use point compression"
  ON
)
option(
  PROFILE_OP_COUNTS
  "Collect counts for field and curve operations"
  OFF
)
option(
  USE_MIXED_ADDITION
  "Convert each element of the key pair to affine coordinates"
  OFF
)

option(
  WITH_PROCPS
  "Use procps for memory profiling"
  ON
)

option(
  CPPDEBUG
  "Enable debugging of C++ STL (does not imply DEBUG)"
  OFF
)

option(
  PERFORMANCE
  "Enable link-time and aggressive optimizations"
  OFF
)

option(
  USE_ASM
  "Use architecture-specific optimized assembly code"
  ON
)

option(
  IS_LIBFF_PARENT
  "Install submodule dependencies if caller originates from here"
  ON
)

set(CMAKE_POSITION_INDEPENDENT_CODE ON)

if(APPLE)
  set(WITH_PROCPS OFF)
endif()

if(CMAKE_COMPILER_IS_GNUCXX OR "${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
  # Common compilation flags and warning configuration
  set(
    CMAKE_CXX_FLAGS
    "${CMAKE_CXX_FLAGS} -std=c++11 -Wall -Wextra -Wfatal-errors"
  )
  if("${MULTICORE}")
      set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fopenmp")
  endif()
endif()

find_path(GMP_INCLUDE_DIR NAMES gmp.h)
find_library(GMP_LIBRARY gmp)
if(GMP_LIBRARY MATCHES ${CMAKE_SHARED_LIBRARY_SUFFIX})
  set(gmp_library_type SHARED)
else()
  set(gmp_library_type STATIC)
endif()
message(STATUS "GMP: ${GMP_LIBRARY}, ${GMP_INCLUDE_DIR}")
add_library(GMP::gmp ${gmp_library_type} IMPORTED)
set_target_properties(
  GMP::gmp PROPERTIES
  IMPORTED_LOCATION ${GMP_LIBRARY}
  INTERFACE_INCLUDE_DIRECTORIES ${GMP_INCLUDE_DIR}
)

find_package(OpenSSL REQUIRED)

if("${WITH_PROCPS}")
  include(FindPkgConfig)
  pkg_check_modules(
    PROCPS
    REQUIRED

    libprocps
  )
else()
  add_definitions(
    -DNO_PROCPS
  )
endif()

add_definitions(
  -DCURVE_${CURVE}
)

enable_testing()

if(${CURVE} STREQUAL "BN128")
  add_definitions(
    -DBN_SUPPORT_SNARK=1
  )
endif()

if("${DEBUG}")
  add_definitions(-DDEBUG=1)
endif()

if("${LOWMEM}")
  add_definitions(-DLOWMEM=1)
endif()

if("${MULTICORE}")
  add_definitions(-DMULTICORE=1)
endif()

if("${BINARY_OUTPUT}")
  add_definitions(-DBINARY_OUTPUT)
endif()

if("${MONTGOMERY_OUTPUT}")
  add_definitions(-DMONTGOMERY_OUTPUT)
endif()

if(NOT "${USE_PT_COMPRESSION}")
  add_definitions(-DNO_PT_COMPRESSION=1)
endif()

if("${PROFILE_OP_COUNTS}")
  add_definitions(-DPROFILE_OP_COUNTS=1)
endif()

if("${USE_MIXED_ADDITION}")
  add_definitions(-DUSE_MIXED_ADDITION=1)
endif()

if("${CPPDEBUG}")
  add_definitions(-D_GLIBCXX_DEBUG -D_GLIBCXX_DEBUG_PEDANTIC)
endif()

if("${PERFORMANCE}")
  add_definitions(-DNDEBUG)
  set(
    CMAKE_CXX_FLAGS
    "${CMAKE_CXX_FLAGS} -flto -fuse-linker-plugin"
  )
  set(
    CMAKE_EXE_LINKER_FLAGS
    "${CMAKE_EXE_LINKER_FLAGS} -flto"
  )
endif()

if("${USE_ASM}")
  add_definitions(-DUSE_ASM)
endif()

# Configure CCache if available
find_program(CCACHE_FOUND ccache)
if(CCACHE_FOUND)
  set_property(GLOBAL PROPERTY RULE_LAUNCH_COMPILE ccache)
  set_property(GLOBAL PROPERTY RULE_LAUNCH_LINK ccache)
endif(CCACHE_FOUND)

if ("${IS_LIBFF_PARENT}")
  # If the option -DGEN_DOC is used, add the `docs` target
  if("${GEN_DOC}")
    include(cmake/documentation.cmake)
  endif()

  # Add a `make check` target that builds and tests
  add_custom_target(check COMMAND ${CMAKE_CTEST_COMMAND})

  # Add a `make profile` target that builds and profiles
  add_custom_target(
    profile
    COMMAND ${CMAKE_COMMAND} -E echo 'Built target finished'
  )

  add_subdirectory(depends)
  add_subdirectory(ffi)
endif()

add_subdirectory(libff)