CMakeLists.txt

# Minimum CMake version.
cmake_minimum_required (VERSION 2.8.12)

# Adjust CMake's module path.
set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_SOURCE_DIR}/cmake/Modules/")

# Options for building MTE. These come from the xSDK compliance rules.
option(USE_XSDK_DEFAULTS "Set to use xSDK defaults for options [ON]." ON)
option(CMAKE_INSTALL_PREFIX "Sets installation prefix [/usr/local].")
option(XSDK_ENABLE_DEBUG "Enables Debug mode builds [OFF]." OFF)
option(BUILD_SHARED_LIBS "Builds shared libraries [ON]." ON)
option(XSDK_WITH_NETCDF "Enables support for netcdf [OFF]." ON)
option(TPL_NETCDF_LIBRARIES "List of absolute paths to netcdf link libraries [].")
option(TPL_NETCDF_INCLUDE_DIRS "List of absolute paths to netcdf include directories [].")

# For now, we disable shared libs on Macs.
if (APPLE)
  set(BUILD_SHARED_LIBS OFF)
endif()

if (NOT CMAKE_INSTALL_PREFIX)
  set(CMAKE_INSTALL_PREFIX /usr/local)
endif()

# Make sure compilers are set. This must be done before enabling languages.
if (NOT CMAKE_C_COMPILER)
  if (NOT $ENV{CC} STREQUAL "")
    set(CMAKE_C_COMPILER $ENV{CC})
  else()
    set(CMAKE_C_COMPILER cc)
  endif()
endif()
if (NOT CMAKE_C_FLAGS)
  set(CMAKE_C_FLAGS $ENV{CFLAGS})
endif()
if (NOT CMAKE_CXX_COMPILER)
  if (NOT $ENV{CXX} STREQUAL "")
    set(CMAKE_CXX_COMPILER $ENV{CXX})
  else()
    set(CMAKE_CXX_COMPILER c++)
  endif()
endif()
if (NOT CMAKE_CXX_FLAGS)
  set(CMAKE_CXX_FLAGS $ENV{CXX_FLAGS})
endif()
if (NOT CMAKE_Fortran_COMPILER)
  if (NOT $ENV{FC} STREQUAL "")
    set(CMAKE_Fortran_COMPILER $ENV{FC})
  else()
    set(CMAKE_Fortran_COMPILER gfortran)
  endif()
endif()
if (NOT CMAKE_Fortran_FLAGS)
  set(CMAKE_Fortran_FLAGS $ENV{FCFLAGS})
endif()
enable_language(C)
enable_language(CXX)
enable_language(Fortran)

# We declare the project here.
project (MTE)

message("-- C compiler is ${CMAKE_C_COMPILER} (${CMAKE_C_COMPILER_ID})")
message("-- CXX compiler is ${CMAKE_CXX_COMPILER} (${CMAKE_CXX_COMPILER_ID})")
message("-- Fortran compiler is ${CMAKE_Fortran_COMPILER} (${CMAKE_Fortran_COMPILER_ID})")

if (BUILD_SHARED_LIBS)
  message("-- MTE will be built as a shared library.")
else()
  message("-- MTE will be built as a static library.")
endif()

# Version numbers.
set (MTE_MAJOR_VERSION 0)
set (MTE_MINOR_VERSION 1)
set (MTE_PATCH_VERSION 0)
set (MTE_VERSION "${MTE_MAJOR_VERSION}.${MTE_MINOR_VERSION}.${MTE_PATCH_VERSION}")

# General C compiler flags.
if (CMAKE_C_COMPILER_ID STREQUAL "GNU")
  set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -std=c99 -Wall -pedantic-errors -Wextra -Werror-implicit-function-declaration")
  set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wno-sign-compare -Wno-unused-parameter -Wno-unused-but-set-variable -Wno-int-to-pointer-cast -Wno-pointer-to-int-cast")

  if (BUILD_SHARED_LIBS)
    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fPIC")
    set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -fPIC")
  endif()

  if (LINUX EQUAL 1)
    # Counter some of GCC's more recent stinginess on Linux.
    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -D_POSIX_C_SOURCE=200809L")# -D_BSD_SOURCE")
  endif()

elseif (CMAKE_C_COMPILER_ID STREQUAL "Clang")
  set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -std=c99 -Wall -pedantic-errors -Wextra -Werror-implicit-function-declaration -fno-builtin")
  set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wno-sign-compare -Wno-unused-parameter -Wno-int-to-pointer-cast -Wno-pointer-to-int-cast -Wno-unused-function")
elseif (CMAKE_C_COMPILER_ID STREQUAL "Intel")
  set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -std=c99 -Wall")
endif()
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${SYS_FLAGS}")

# Fortran compiler flags.
if (CMAKE_Fortran_COMPILER_ID STREQUAL "GNU")
  set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -W -Wall -std=gnu -pedantic -Wno-unused-variable -Wno-unused-parameter -DCPRGNU")
endif()

# Fortran compiler flags.
if (CMAKE_Fortran_COMPILER_ID STREQUAL "Intel")
  set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -DCPRINTEL")
endif()


# Figure out the system type.
set(MTE_HAVE_BOOL 1) # All reasonable C99 compilers have this now.
if (APPLE EQUAL 1)
  set(SYS_FLAGS "-DAPPLE=1")
  set(DYLIB_SUFFIX "dylib")
  set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -framework Accelerate")
else ()
  if (LINUX EQUAL 1)
    set(SYS_FLAGS "-DLINUX=1")
    set(DYLIB_SUFFIX "so")
  else()
    if (WIN32 EQUAL 1)
      set(MTE_HAVE_BOOL 0) # MS doesn't have reasonable C compilers.
      set(SYS_FLAGS "-DWINDOWS=1")
      set(DYLIB_SUFFIX "dll")
    endif()
  endif ()
endif ()

# Here we make sure CMake-installed binaries use the correct runpath, and
# that the path is not stripped during installation.
set(CMAKE_INSTALL_RPATH "${CMAKE_INSTALL_PREFIX}/lib")
set(CMAKE_INSTALL_RPATH_USE_LINK_PATH TRUE)

# Check third-party library dependencies.
set(MTE_NEED_PETSC 0)

if (XSDK_WITH_NETCDF)
  if (NOT TPL_NETCDF_LIBRARIES)
    message(FATAL_ERROR "TPL_NETCDF_LIBRARIES option be set for netcdf support to be enabled.")
  endif()
#X#  foreach(lib ${TPL_NETCDF_LIBRARIES})
#X#    if (NOT EXISTS ${lib})
#X#      message(FATAL_ERROR "netcdf library not found: ${lib}")
#X#    endif()
#X#  endforeach()

  if (NOT TPL_NETCDF_INCLUDE_DIRS)
    message(FATAL_ERROR "TPL_NETCDF_INCLUDE_DIRS option be set for netcdf support to be enabled.")
  endif()
#X#  foreach(dir ${TPL_NETCDF_INCLUDE_DIRS})
#X#    if (NOT EXISTS ${dir})
#X#      message(FATAL_ERROR "netcdf include directory not found: ${dir}")
#X#    endif()
#X#  endforeach()

  message("-- Enabled support for netcdf.")
  list(APPEND MTE_TPLS ${TPL_NETCDF_LIBRARIES})
  list(APPEND MTE_INCLUDE_DIRS ${TPL_NETCDF_INCLUDE_DIRS})
  set(MTE_HAVE_NETCDF 1)
else()
  set(MTE_HAVE_NETCDF 0)
endif()


# Other third-party libraries.
#add_subdirectory(3rd-party)

# Include the binary directory in the header file search path,
# since it's where we place the third-party libraries.
include_directories("${PROJECT_BINARY_DIR}")
include_directories("${PROJECT_BINARY_DIR}/include")
link_directories("${PROJECT_BINARY_DIR}/lib")
include_directories(${MTE_INCDIRS})

# Unit testing.
enable_testing()

# Source code itself.
include_directories("${PROJECT_SOURCE_DIR}")
add_subdirectory(src)

# Drivers for benchmarks.
#X#add_subdirectory(drivers)

# Benchmarks.
#X#add_subdirectory(benchmarks)

# Now that we have gathered all our libraries, generate an mte.cmake
# file that contains all the vital information.
configure_file(
  "${CMAKE_CURRENT_SOURCE_DIR}/cmake/Templates/mte.cmake.in"
  "${CMAKE_CURRENT_BINARY_DIR}/mte.cmake"
  @ONLY
)

# Install miscellaneous build/test files.
install(FILES ${CMAKE_CURRENT_BINARY_DIR}/mte.cmake DESTINATION share/MTE)