CMakeLists.txt

# This file is a part of pandas. See LICENSE for details about reuse and
# copyright holders
#
# Assembled from BSD/MIT/Apache-licensed code from a variety of copyright
# holders, including at least
#
# Copyright 2012-16 Cloudera, Inc.
# Copyright (C) 2011-15 DyND Developers
# Copyright (C) 2012-15 Continuum Analytics, Inc.

cmake_minimum_required(VERSION 2.7)
project(pandas)

set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_SOURCE_DIR}/cmake_modules")
include(CMakeParseArguments)

set(BUILD_SUPPORT_DIR ${CMAKE_CURRENT_SOURCE_DIR}/build-support)
set(THIRDPARTY_DIR ${CMAKE_CURRENT_SOURCE_DIR}/thirdparty)

# Allow "make install" to not depend on all targets.
#
# Must be declared in the top-level CMakeLists.txt.
set(CMAKE_SKIP_INSTALL_ALL_DEPENDENCY true)

# For thirdparty libs: googletest
# include(toolchain)

set(CMAKE_MACOSX_RPATH 1)
set(CMAKE_OSX_DEPLOYMENT_TARGET 10.9)

# Top level cmake dir
if("${CMAKE_SOURCE_DIR}" STREQUAL "${CMAKE_CURRENT_SOURCE_DIR}")
  option(PANDAS_BUILD_TESTS
    "Build the C++ unit tests"
    ON)

  option(PANDAS_BUILD_CYTHON
    "Build the Cython extensions"
    ON)
endif()

############################################################
# Compiler flags
############################################################

# compiler flags that are common across debug/release builds
#  - msse4.2: Enable sse4.2 compiler intrinsics.
#  - Wall: Enable all warnings.
#  - Wno-sign-compare: suppress warnings for comparison between signed and unsigned
#    integers
#  -Wno-deprecated: some of the gutil code includes old things like ext/hash_set, ignore that
#  - pthread: enable multithreaded malloc
#  - -D__STDC_FORMAT_MACROS: for PRI* print format macros
#  -fno-strict-aliasing
#     Assume programs do not follow strict aliasing rules.
#     GCC cannot always verify whether strict aliasing rules are indeed followed due to
#     fundamental limitations in escape analysis, which can result in subtle bad code generation.
#     This has a small perf hit but worth it to avoid hard to debug crashes.
set(CXX_COMMON_FLAGS "-std=c++11 -fno-strict-aliasing -msse4.2 -Wall -Wno-sign-compare -Wno-deprecated -pthread -D__STDC_FORMAT_MACROS")

# compiler flags for different build types (run 'cmake -DCMAKE_BUILD_TYPE=<type> .')
# For all builds:
# For CMAKE_BUILD_TYPE=Debug
#   -ggdb: Enable gdb debugging
# For CMAKE_BUILD_TYPE=FastDebug
#   Same as DEBUG, except with some optimizations on.
# For CMAKE_BUILD_TYPE=Release
#   -O3: Enable all compiler optimizations
#   -g: Enable symbols for profiler tools (TODO: remove for shipping)
#   -DNDEBUG: Turn off dchecks/asserts/debug only code.
#   -fno-omit-frame-pointer
#       use frame pointers to allow simple stack frame walking for backtraces.
#       This has a small perf hit but worth it for the ability to profile in production
# For profile guided optimization (PGO) builds, in addition to the flags for release builds:
#   1. Build first with CMAKE_BUILD_TYPE_PROFILE_GEN:
#     -fprofile-generate: Indicates compiler should insert profile guided optimization events
#   2. Run the benchmarks (generates *.gcda profiling data).
#   3. Build again with CMAKE_BUILD_TYPE_PROFILE_BUILD
#     -fprofile-use: Compiler will use the profile outputs for optimizations
set(CXX_FLAGS_DEBUG "-ggdb")
set(CXX_FLAGS_FASTDEBUG "-ggdb -O1 -fno-omit-frame-pointer")
set(CXX_FLAGS_RELEASE "-O3 -g -DNDEBUG -fno-omit-frame-pointer")

set(CXX_FLAGS_PROFILE_GEN "${CXX_FLAGS_RELEASE} -fprofile-generate")
set(CXX_FLAGS_PROFILE_BUILD "${CXX_FLAGS_RELEASE} -fprofile-use")

# if no build build type is specified, default to debug builds
if (NOT CMAKE_BUILD_TYPE)
  set(CMAKE_BUILD_TYPE Debug)
endif(NOT CMAKE_BUILD_TYPE)

string (TOUPPER ${CMAKE_BUILD_TYPE} CMAKE_BUILD_TYPE)

# Alias RELEASE as RELWITHDEBINFO and MINSIZEREL. These are common CMake
# release type names and this provides compatibility with the CLion IDE.
if ("${CMAKE_BUILD_TYPE}" STREQUAL "RELWITHDEBINFO" OR "${CMAKE_BUILD_TYPE}" STREQUAL "MINSIZEREL")
  set(CMAKE_BUILD_TYPE RELEASE)
endif ()

# Set compile flags based on the build type.
message("Configured for ${CMAKE_BUILD_TYPE} build (set with cmake -DCMAKE_BUILD_TYPE={release,debug,...})")
if ("${CMAKE_BUILD_TYPE}" STREQUAL "DEBUG")
  set(CMAKE_CXX_FLAGS ${CXX_FLAGS_DEBUG})
elseif ("${CMAKE_BUILD_TYPE}" STREQUAL "FASTDEBUG")
  set(CMAKE_CXX_FLAGS ${CXX_FLAGS_FASTDEBUG})
elseif ("${CMAKE_BUILD_TYPE}" STREQUAL "RELEASE")
  set(CMAKE_CXX_FLAGS ${CXX_FLAGS_RELEASE})
elseif ("${CMAKE_BUILD_TYPE}" STREQUAL "PROFILE_GEN")
  set(CMAKE_CXX_FLAGS ${CXX_FLAGS_PROFILE_GEN})
elseif ("${CMAKE_BUILD_TYPE}" STREQUAL "PROFILE_BUILD")
  set(CMAKE_CXX_FLAGS ${CXX_FLAGS_PROFILE_BUILD})
else()
  message(FATAL_ERROR "Unknown build type: ${CMAKE_BUILD_TYPE}")
endif ()

# Add common flags
set(CMAKE_CXX_FLAGS "${CXX_COMMON_FLAGS} ${CMAKE_CXX_FLAGS}")

# Determine compiler version
include(CompilerInfo)

if ("${COMPILER_FAMILY}" STREQUAL "clang")
  # Using Clang with ccache causes a bunch of spurious warnings that are
  # purportedly fixed in the next version of ccache. See the following for details:
  #
  #   http://petereisentraut.blogspot.com/2011/05/ccache-and-clang.html
  #   http://petereisentraut.blogspot.com/2011/09/ccache-and-clang-part-2.html
  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Qunused-arguments")

  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-unused-parameter -Wno-unused-function -Wno-error")

  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -stdlib=libc++")
endif()

# Sanity check linking option.
if (NOT PANDAS_LINK)
  set(PANDAS_LINK "a")
elseif(NOT ("auto" MATCHES "^${PANDAS_LINK}" OR
            "dynamic" MATCHES "^${PANDAS_LINK}" OR
            "static" MATCHES "^${PANDAS_LINK}"))
  message(FATAL_ERROR "Unknown value for PANDAS_LINK, must be auto|dynamic|static")
else()
  # Remove all but the first letter.
  string(SUBSTRING "${PANDAS_LINK}" 0 1 PANDAS_LINK)
endif()

# For any C code, use the same flags.
set(CMAKE_C_FLAGS "${CMAKE_CXX_FLAGS}")

# Code coverage
if ("${PANDAS_GENERATE_COVERAGE}")
  if("${CMAKE_CXX_COMPILER}" MATCHES ".*clang.*")
    # There appears to be some bugs in clang 3.3 which cause code coverage
    # to have link errors, not locating the llvm_gcda_* symbols.
    # This should be fixed in llvm 3.4 with http://llvm.org/viewvc/llvm-project?view=revision&revision=184666
    message(SEND_ERROR "Cannot currently generate coverage with clang")
  endif()
  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} --coverage -DCOVERAGE_BUILD")

  # For coverage to work properly, we need to use static linkage. Otherwise,
  # __gcov_flush() doesn't properly flush coverage from every module.
  # See http://stackoverflow.com/questions/28164543/using-gcov-flush-within-a-library-doesnt-force-the-other-modules-to-yield-gc
  if("${PANDAS_LINK}" STREQUAL "a")
    message("Using static linking for coverage build")
    set(PANDAS_LINK "s")
  elseif("${PANDAS_LINK}" STREQUAL "d")
    message(SEND_ERROR "Cannot use coverage with static linking")
  endif()
endif()

# If we still don't know what kind of linking to perform, choose based on
# build type (developers like fast builds).
if ("${PANDAS_LINK}" STREQUAL "a")
  if ("${CMAKE_BUILD_TYPE}" STREQUAL "DEBUG" OR
      "${CMAKE_BUILD_TYPE}" STREQUAL "FASTDEBUG")
    message("Using dynamic linking for ${CMAKE_BUILD_TYPE} builds")
    set(PANDAS_LINK "d")
  else()
    message("Using static linking for ${CMAKE_BUILD_TYPE} builds")
    set(PANDAS_LINK "s")
  endif()
endif()

# Are we using the gold linker? It doesn't work with dynamic linking as
# weak symbols aren't properly overridden, causing tcmalloc to be omitted.
# Let's flag this as an error in RELEASE builds (we shouldn't release a
# product like this).
#
# See https://sourceware.org/bugzilla/show_bug.cgi?id=16979 for details.
#
# The gold linker is only for ELF binaries, which OSX doesn't use. We can
# just skip.
if (NOT APPLE)
  execute_process(COMMAND ${CMAKE_CXX_COMPILER} -Wl,--version OUTPUT_VARIABLE LINKER_OUTPUT)
endif ()
if (LINKER_OUTPUT MATCHES "gold")
  if ("${PANDAS_LINK}" STREQUAL "d" AND
      "${CMAKE_BUILD_TYPE}" STREQUAL "RELEASE")
    message(SEND_ERROR "Cannot use gold with dynamic linking in a RELEASE build "
      "as it would cause tcmalloc symbols to get dropped")
  else()
    message("Using gold linker")
  endif()
  set(PANDAS_USING_GOLD 1)
else()
  message("Using ld linker")
endif()

# Having set PANDAS_LINK due to build type and/or sanitizer, it's now safe to
# act on its value.
if ("${PANDAS_LINK}" STREQUAL "d")
  set(BUILD_SHARED_LIBS ON)

  # Position independent code is only necessary when producing shared objects.
  add_definitions(-fPIC)
endif()

# set compile output directory
string (TOLOWER ${CMAKE_BUILD_TYPE} BUILD_SUBDIR_NAME)

# If build in-source, create the latest symlink. If build out-of-source, which is
# preferred, simply output the binaries in the build folder
if (${CMAKE_SOURCE_DIR} STREQUAL ${CMAKE_CURRENT_BINARY_DIR})
  set(BUILD_OUTPUT_ROOT_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}/build/${BUILD_SUBDIR_NAME}/")
  # Link build/latest to the current build directory, to avoid developers
  # accidentally running the latest debug build when in fact they're building
  # release builds.
  FILE(MAKE_DIRECTORY ${BUILD_OUTPUT_ROOT_DIRECTORY})
  if (NOT APPLE)
    set(MORE_ARGS "-T")
  endif()
EXECUTE_PROCESS(COMMAND ln ${MORE_ARGS} -sf ${BUILD_OUTPUT_ROOT_DIRECTORY}
  ${CMAKE_CURRENT_BINARY_DIR}/build/latest)
else()
  # set(BUILD_OUTPUT_ROOT_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}/${BUILD_SUBDIR_NAME}/")
  set(BUILD_OUTPUT_ROOT_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}")

endif()

# where to put generated archives (.a files)
set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY "${BUILD_OUTPUT_ROOT_DIRECTORY}")
set(ARCHIVE_OUTPUT_DIRECTORY "${BUILD_OUTPUT_ROOT_DIRECTORY}")

# where to put generated libraries (.so files)
set(CMAKE_LIBRARY_OUTPUT_DIRECTORY "${BUILD_OUTPUT_ROOT_DIRECTORY}")
set(LIBRARY_OUTPUT_DIRECTORY "${BUILD_OUTPUT_ROOT_DIRECTORY}")

# where to put generated binaries
set(EXECUTABLE_OUTPUT_PATH "${BUILD_OUTPUT_ROOT_DIRECTORY}")

############################################################
# Visibility
############################################################
# For generate_export_header() and add_compiler_export_flags().
include(GenerateExportHeader)

# add_library() wrapper that adds a second variant of the library for use in the
# exported Kudu C++ client. This variant is suffixed with "_exported" and is
# compiled with special visibility flags to hide all symbols except those that
# are part of the public ABI.
#
# There are two different kinds of exported libraries: internal and leaf.
# Internal libraries are static archives while leaf libraries are shared
# objects built from internal libraries. In practice there is only one leaf
# library: the Kudu C++ client itself.
#
# Arguments:
#
# LIB_NAME is the name of the library. It must come first. Required.
#
# SRCS is the list of source files to compile into the library. Required.
#
# DEPS is the list of targets that both library variants depend on. Required.
#
# NONLINK_DEPS is the list of (non-linked) targets that both library variants
# depend on. Optional.
#
# COMPILE_FLAGS is a string containing any additional compilation flags that
# should be added to both library variants. Optional.
#
# EXPORTED_SHARED is a toggle that, if set, indicates that the exported variant
# is a "leaf" library. Otherwise it is an "internal" library. Optional.
#
# EXPORTED_OUTPUT_NAME is a string describing a different file name for the
# exported library variant. If not set, defaults to LIB_NAME. Optional.
#
# EXPORTED_OUTPUT_DIRECTORY is a string describing a different directory where
# the exported library variant should be written. If not set, defaults to the
# directory where this function was called. Optional.
#
# EXPORTED_DEPS is a list of targets that the exported library variant depends
# on. If not set, defaults to DEPS. Optional.
function(ADD_EXPORTABLE_LIBRARY LIB_NAME)
  # Parse the arguments.
  set(options EXPORTED_SHARED)
  set(one_value_args COMPILE_FLAGS EXPORTED_OUTPUT_NAME EXPORTED_OUTPUT_DIRECTORY)
  set(multi_value_args SRCS DEPS EXPORTED_DEPS NONLINK_DEPS)
  cmake_parse_arguments(ARG "${options}" "${one_value_args}" "${multi_value_args}" ${ARGN})
  if(ARG_UNPARSED_ARGUMENTS)
    message(SEND_ERROR "Error: unrecognized arguments: ${ARG_UNPARSED_ARGUMENTS}")
  endif()

  # First add the regular version of the library. It uses
  # whatever linkage was defined globally.
  add_library(${LIB_NAME} ${ARG_SRCS})
  if(ARG_COMPILE_FLAGS)
    set_target_properties(${LIB_NAME}
      PROPERTIES COMPILE_FLAGS ${ARG_COMPILE_FLAGS})
  endif()
  target_link_libraries(${LIB_NAME} ${ARG_DEPS})
  if(ARG_NONLINK_DEPS)
    add_dependencies(${LIB_NAME} ${ARG_NONLINK_DEPS})
  endif()

  # Now start setting up the exported variant.
  set(EXPORTED_LIB_NAME ${LIB_NAME}_exported)
  if(ARG_EXPORTED_SHARED)
    # Leaf library.
    set(EXPORTED_LINKAGE "SHARED")
    set(EXPORTED_LINK_PRIVATE "LINK_PRIVATE")
  else()
    # Internal library.
    set(EXPORTED_LINKAGE "STATIC")
    set(EXPORTED_LINK_PRIVATE)
  endif()
  add_library(${EXPORTED_LIB_NAME} ${EXPORTED_LINKAGE} ${ARG_SRCS})

  # Compile with visibility flags:
  # - default for classes annotated with PANDAS_EXPORT.
  # - hidden for classes annotated with PANDAS_NO_EXPORT.
  # - hidden for everything else.
  add_compiler_export_flags(EXPORTED_FLAGS)

  # Exported variants are either static archives that will be linked to a shared
  # object, or shared objects. Either way, -fPIC is needed.
  if("${PANDAS_LINK}" STREQUAL "s")
    set(EXPORTED_FLAGS "${EXPORTED_FLAGS} -fPIC")
  endif()

  # We need to remove some definitions previously added at directory scope.
  # There doesn't appear to be a good way to do this in cmake, so we do it via
  # the compiler with -U (e.g. "-UFOO" means "undefine the FOO definition").
  # Adding insult to injury, the COMPILE_DEFINITIONS property adds a -D prefix
  # to anything passed into it, so we're forced to handle the removal via
  # COMPILE_FLAGS, which, lucky for us, is emitted on the command line after
  # COMPILE_DEFINITIONS.

  # Exported variants need PANDAS_EXPORT definitions to take effect.
  set(EXPORTED_FLAGS "${EXPORTED_FLAGS} -UPANDAS_STATIC_DEFINE")

  # Exported variants may not use tcmalloc.
  set(EXPORTED_FLAGS "${EXPORTED_FLAGS} -UTCMALLOC_ENABLED")

  set_target_properties(${EXPORTED_LIB_NAME}
    PROPERTIES COMPILE_FLAGS "${ARG_COMPILE_FLAGS} ${EXPORTED_FLAGS}")

  # Handle EXPORTED_OUTPUT_NAME and EXPORTED_OUTPUT_DIRECTORY.
  if(ARG_EXPORTED_OUTPUT_NAME)
    set_target_properties(${EXPORTED_LIB_NAME}
      PROPERTIES LIBRARY_OUTPUT_NAME ${ARG_EXPORTED_OUTPUT_NAME})
  endif()
  if(ARG_EXPORTED_OUTPUT_DIRECTORY)
    set_target_properties(${EXPORTED_LIB_NAME}
      PROPERTIES LIBRARY_OUTPUT_DIRECTORY ${ARG_EXPORTED_OUTPUT_DIRECTORY})
  endif()

  # Set up exported variant dependent targets.
  #
  # Every linked dependency is suffixed with "_exported". This is fine; the
  # exported target graph is expected to be complete, and ADD_THIRDPARTY_LIB
  # will provide an "exported variant" for each third party target.
  if(ARG_EXPORTED_DEPS)
    set(EXPORTED_DEPS ${ARG_EXPORTED_DEPS})
  else()
    set(EXPORTED_DEPS ${ARG_DEPS})
  endif()
  foreach(DEP ${EXPORTED_DEPS})
    list(APPEND EXPORTED_SUFFIXED_DEPS "${DEP}_exported")
  endforeach()
  target_link_libraries(${EXPORTED_LIB_NAME} ${EXPORTED_LINK_PRIVATE} ${EXPORTED_SUFFIXED_DEPS})
  if(ARG_NONLINK_DEPS)
    add_dependencies(${EXPORTED_LIB_NAME} ${ARG_NONLINK_DEPS})
  endif()
endfunction()

############################################################
# Dependencies
############################################################
function(ADD_THIRDPARTY_LIB LIB_NAME)
  set(options)
  set(one_value_args SHARED_LIB STATIC_LIB)
  set(multi_value_args DEPS)
  cmake_parse_arguments(ARG "${options}" "${one_value_args}" "${multi_value_args}" ${ARGN})
  if(ARG_UNPARSED_ARGUMENTS)
    message(SEND_ERROR "Error: unrecognized arguments: ${ARG_UNPARSED_ARGUMENTS}")
  endif()

  if(("${PANDAS_LINK}" STREQUAL "s" AND ARG_STATIC_LIB) OR (NOT ARG_SHARED_LIB))
    if(NOT ARG_STATIC_LIB)
      message(FATAL_ERROR "No static or shared library provided for ${LIB_NAME}")
    endif()
    add_library(${LIB_NAME} STATIC IMPORTED)
    set_target_properties(${LIB_NAME}
      PROPERTIES IMPORTED_LOCATION "${ARG_STATIC_LIB}")
    message("Added static library dependency ${LIB_NAME}: ${ARG_STATIC_LIB}")
  else()
    add_library(${LIB_NAME} SHARED IMPORTED)
    set_target_properties(${LIB_NAME}
      PROPERTIES IMPORTED_LOCATION "${ARG_SHARED_LIB}")
    message("Added shared library dependency ${LIB_NAME}: ${ARG_SHARED_LIB}")
  endif()

  if(ARG_DEPS)
    set_target_properties(${LIB_NAME}
      PROPERTIES IMPORTED_LINK_INTERFACE_LIBRARIES "${ARG_DEPS}")
  endif()

  # Set up an "exported variant" for this thirdparty library (see "Visibility"
  # above). It's the same as the real target, just with an "_exported" suffix.
  # We prefer the static archive if it exists (as it's akin to an "internal"
  # library), but we'll settle for the shared object if we must.
  #
  # A shared object exported variant will force any "leaf" library that
  # transitively depends on it to also depend on it at runtime; this is
  # desirable for some libraries (e.g. cyrus_sasl).
  set(LIB_NAME_EXPORTED ${LIB_NAME}_exported)
  if(ARG_STATIC_LIB)
    add_library(${LIB_NAME_EXPORTED} STATIC IMPORTED)
    set_target_properties(${LIB_NAME_EXPORTED}
      PROPERTIES IMPORTED_LOCATION "${ARG_STATIC_LIB}")
  else()
    add_library(${LIB_NAME_EXPORTED} SHARED IMPORTED)
    set_target_properties(${LIB_NAME_EXPORTED}
      PROPERTIES IMPORTED_LOCATION "${ARG_SHARED_LIB}")
  endif()
  if(ARG_DEPS)
    set_target_properties(${LIB_NAME_EXPORTED}
      PROPERTIES IMPORTED_LINK_INTERFACE_LIBRARIES "${ARG_DEPS}")
  endif()
endfunction()

## Python and libraries
find_package(PythonInterp REQUIRED)
find_package(PythonLibsNew REQUIRED)
find_package(NumPy REQUIRED)
include(UseCython)

message(STATUS "Found Python dynamic library: ${PYTHON_LIBRARIES}")

include_directories(SYSTEM
  ${NUMPY_INCLUDE_DIRS}
  ${PYTHON_INCLUDE_DIRS}
  thirdparty/
  src)

############################################################
# Testing
############################################################

# Add a new test case, with or without an executable that should be built.
#
# REL_TEST_NAME is the name of the test. It may be a single component
# (e.g. monotime-test) or contain additional components (e.g.
# net/net_util-test). Either way, the last component must be a globally
# unique name.
#
# Arguments after the test name will be passed to set_tests_properties().
function(ADD_PANDAS_TEST REL_TEST_NAME)
  if(NO_TESTS)
    return()
  endif()
  get_filename_component(TEST_NAME ${REL_TEST_NAME} NAME_WE)

  if(EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/${REL_TEST_NAME}.cc)
    # This test has a corresponding .cc file, set it up as an executable.
    set(TEST_PATH "${EXECUTABLE_OUTPUT_PATH}/${TEST_NAME}")
    add_executable(${TEST_NAME} "${REL_TEST_NAME}.cc")
    target_link_libraries(${TEST_NAME} ${PANDAS_TEST_LINK_LIBS})
  else()
    # No executable, just invoke the test (probably a script) directly.
    set(TEST_PATH ${CMAKE_CURRENT_SOURCE_DIR}/${REL_TEST_NAME})
  endif()

  add_test(${TEST_NAME}
    ${BUILD_SUPPORT_DIR}/run-test.sh ${TEST_PATH})
  if(ARGN)
    set_tests_properties(${TEST_NAME} PROPERTIES ${ARGN})
  endif()
endfunction()

# A wrapper for add_dependencies() that is compatible with NO_TESTS.
function(ADD_PANDAS_TEST_DEPENDENCIES REL_TEST_NAME)
  if(NO_TESTS)
    return()
  endif()
  get_filename_component(TEST_NAME ${REL_TEST_NAME} NAME_WE)

  add_dependencies(${TEST_NAME} ${ARGN})
endfunction()

enable_testing()

if(PANDAS_BUILD_TESTS)
  add_custom_target(unittest ctest -L unittest)

  if("$ENV{GTEST_HOME}" STREQUAL "")
    if(APPLE)
      set(GTEST_CMAKE_CXX_FLAGS "-fPIC -std=c++11 -stdlib=libc++ -DGTEST_USE_OWN_TR1_TUPLE=1 -Wno-unused-value -Wno-ignored-attributes")
    else()
      set(GTEST_CMAKE_CXX_FLAGS "-fPIC")
    endif()

    ExternalProject_Add(googletest_ep
      URL "https://github.com/google/googletest/archive/release-${GTEST_VERSION}.tar.gz"
      CMAKE_ARGS -DCMAKE_CXX_FLAGS=${GTEST_CMAKE_CXX_FLAGS}
      # googletest doesn't define install rules, so just build in the
      # source dir and don't try to install.  See its README for
      # details.
      BUILD_IN_SOURCE 1
      INSTALL_COMMAND "")

    set(GTEST_PREFIX "${CMAKE_CURRENT_BINARY_DIR}/googletest_ep-prefix/src/googletest_ep")
    set(GTEST_INCLUDE_DIR "${GTEST_PREFIX}/include")
    set(GTEST_STATIC_LIB "${GTEST_PREFIX}/libgtest.a")
    set(GTEST_VENDORED 1)
  else()
    find_package(GTest REQUIRED)
    set(GTEST_VENDORED 0)
  endif()

  message(STATUS "GTest include dir: ${GTEST_INCLUDE_DIR}")
  message(STATUS "GTest static library: ${GTEST_STATIC_LIB}")
  include_directories(SYSTEM ${GTEST_INCLUDE_DIR})
  ADD_THIRDPARTY_LIB(gtest
    STATIC_LIB ${GTEST_STATIC_LIB})

  if(GTEST_VENDORED)
    add_dependencies(gtest googletest_ep)
  endif()
endif()

############################################################
# "make ctags" target
############################################################
if (UNIX)
  add_custom_target(ctags ctags -R --languages=c++,c)
endif (UNIX)

############################################################
# "make etags" target
############################################################
if (UNIX)
  add_custom_target(tags etags --members --declarations
  `find ${CMAKE_CURRENT_SOURCE_DIR}/src
   -name \\*.cc -or -name \\*.hh -or -name \\*.cpp -or -name \\*.h -or -name \\*.c -or
   -name \\*.f`)
  add_custom_target(etags DEPENDS tags)
endif (UNIX)

############################################################
# "make cscope" target
############################################################
if (UNIX)
  add_custom_target(cscope find ${CMAKE_CURRENT_SOURCE_DIR}
  ( -name \\*.cc -or -name \\*.hh -or -name \\*.cpp -or
    -name \\*.h -or -name \\*.c -or -name \\*.f )
  -exec echo \"{}\" \; > cscope.files && cscope -q -b VERBATIM)
endif (UNIX)

############################################################
# "make lint" target
############################################################
if (UNIX)
  # Full lint
  add_custom_target(lint ${BUILD_SUPPORT_DIR}/cpplint.py
  --verbose=4
  --filter=-whitespace/comments,-readability/todo,-build/header_guard,-build/include_order
    `find ${CMAKE_CURRENT_SOURCE_DIR}/src -name \\*.cc -or -name \\*.h`)
endif (UNIX)

#############################################################
# Test linking

set(PANDAS_MIN_TEST_LIBS
  pandas_test_main
  pandas)

# Unit tests need to link to libpython. NumPy can be linked by importing the
# numpy module
if(NOT APPLE)
  ADD_THIRDPARTY_LIB(python
    SHARED_LIB "${PYTHON_LIBRARIES}")
  list(APPEND PANDAS_MIN_TEST_LIBS python)
endif()

set(PANDAS_TEST_LINK_LIBS ${PANDAS_MIN_TEST_LIBS})

############################################################
# Subdirectories
############################################################

add_subdirectory(src/pandas)
add_subdirectory(src/pandas/util)

set(PANDAS_SRCS
  src/pandas/array.cc
  src/pandas/buffer.cc
  src/pandas/dispatch.cc
  src/pandas/init.cc
  src/pandas/memory.cc
  src/pandas/numpy_interop.cc
  src/pandas/pytypes.cc
  src/pandas/status.cc
  src/pandas/types.cc

  src/pandas/types/boolean.cc
  src/pandas/types/category.cc
  src/pandas/types/integer.cc
  src/pandas/types/floating.cc
)

add_library(pandas SHARED
  ${PANDAS_SRCS})
target_link_libraries(pandas
	pandas_util)
set_target_properties(pandas PROPERTIES LINKER_LANGUAGE CXX)

if(APPLE)
    set_target_properties(pandas PROPERTIES LINK_FLAGS "-undefined dynamic_lookup")
endif()

############################################################
# Setup and build Cython modules
############################################################

foreach(pyx_api_file
  pandas/native.pyx
  pandas/internals/config.pyx)
    set_source_files_properties(${pyx_api_file} PROPERTIES CYTHON_API 1)
endforeach(pyx_api_file)

set(USE_RELATIVE_RPATH ON)
set(CMAKE_BUILD_WITH_INSTALL_RPATH TRUE)

if (PANDAS_BUILD_CYTHON)
  set(CYTHON_MODULES
    native
    internals.config)
endif()

foreach(module ${CYTHON_MODULES})
    string(REPLACE "." ";" directories ${module})
    list(GET directories -1 module_name)
    list(REMOVE_AT directories -1)

    string(REPLACE "." "/" module_root "${module}")
    set(module_SRC pandas/${module_root}.pyx)
    set_source_files_properties(${module_SRC} PROPERTIES CYTHON_IS_CXX 1)

    cython_add_module(${module_name}
      ${module_name}_pyx
      ${module_name}_output
      ${module_SRC})

    if (directories)
        string(REPLACE ";" "/" module_output_directory ${directories})
        set_target_properties(${module_name} PROPERTIES
          LIBRARY_OUTPUT_DIRECTORY ${module_output_directory})
    endif()

    if(APPLE)
        set(module_install_rpath "@loader_path")
    else()
        set(module_install_rpath "$ORIGIN")
    endif()
    list(LENGTH directories i)
    while(${i} GREATER 0)
        set(module_install_rpath "${module_install_rpath}/..")
        math(EXPR i "${i} - 1" )
    endwhile(${i} GREATER 0)

    # for inplace development for now
    set(module_install_rpath "${CMAKE_SOURCE_DIR}/pandas/")

    set_target_properties(${module_name} PROPERTIES
      INSTALL_RPATH ${module_install_rpath})
    target_link_libraries(${module_name} pandas)
endforeach(module)

# add_dependencies(pandas native_pyx)