# * Try to find Boehm GC Once done, this will define
#
# BOEHM_GC_FOUND - system has Boehm GC BOEHM_GC_INCLUDE_DIR - the Boehm GC
# include directories BOEHM_GC_LIBRARIES - link these to use Boehm GC
#
# Copyright (c) 2010-2015  Takashi Kato <ktakashi@ymail.com>
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# 1. Redistributions of source code must retain the above copyright notice, this
#   list of conditions and the following disclaimer.
#
# 1. Redistributions in binary form must reproduce the above copyright notice,
#   this list of conditions and the following disclaimer in the documentation
#   and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
# $Id: $
#

# CMake module to find Boehm GC

# use pkg-config if available
find_package(PkgConfig)
pkg_check_modules(PC_BDW_GC QUIET bdw-gc)

# try newer one first in case of gc.h is overwritten.
find_path(BOEHM_GC_INCLUDE_DIR gc/gc.h HINTS ${PC_BDW_GC_INCLUDEDIR}
                                             ${PC_BDW_GC_INCLUDE_DIRS})

if(NOT BOEHM_GC_INCLUDE_DIR)
  find_path(BOEHM_GC_INCLUDE_DIR gc.h HINTS ${PC_BDW_GC_INCLUDEDIR}
                                            ${PC_BDW_GC_INCLUDE_DIRS})
  if(BOEHM_GC_INCLUDE_DIR)
    set(HAVE_GC_H TRUE)
  endif()
else()
  set(HAVE_GC_GC_H TRUE)
endif()

# For FreeBSD we need to use gc-threaded
if(${CMAKE_SYSTEM_NAME} STREQUAL "FreeBSD")
  # checks if 'gc' supports 'GC_get_parallel' and if it does then use it
  include(${CMAKE_ROOT}/Modules/CheckCSourceCompiles.cmake)
  # not sure if this links properly...
  find_library(
    BOEHM_GC_LIBRARIES
    NAMES gc
    HINTS ${PC_BDW_GC_LIBDIR} ${PC_BDW_GC_LIBRARY_DIRS})
  message(STATUS "GC library ${BOEHM_GC_LIBRARIES}")
  set(CMAKE_REQUIRED_LIBRARIES "gc")
  set(CMAKE_REQUIRED_DEFINITIONS "-DGC_THREADS")
  set(CMAKE_REQUIRED_INCLUDES "${BOEHM_GC_INCLUDE_DIR}")
  set(CMAKE_REQUIRED_FLAGS "-L${PC_BDW_GC_LIBRARY_DIRS}")
  message(STATUS "Boehm GC include dir: ${CMAKE_REQUIRED_INCLUDES}")
  check_c_source_runs(
    "#include <gc.h>
int main() {
int i= GC_get_parallel();
return 0;
}
"
    GC_GET_PARALLEL_WORKS)
  if(NOT GC_GET_PARALLEL_WORKS)
    message(STATUS "Try gc-threaded")

    # bdw-gc-threaded is the proper name for FreeBSD pkg-config
    pkg_check_modules(PC_BDW_GC_THREADED bdw-gc-threaded)
    find_library(
      BOEHM_GC_THREADED_LIBRARIES
      NAMES gc-threaded
      HINTS ${PC_BDW_GC_THREADED_LIBDIR} ${PC_BDW_GC_THREADED_THREADED_DIRS})

    message(STATUS "GC threaded library ${BOEHM_GC_THREADED_LIBRARIES}")
    if(BOEHM_GC_THREADED_LIBRARIES)
      # OK just use it
      set(BOEHM_GC_LIBRARIES "${BOEHM_GC_THREADED_LIBRARIES}")
    endif()
  endif()
else()
  find_library(
    BOEHM_GC_LIBRARIES
    NAMES gc
    HINTS ${PC_BDW_GC_LIBDIR} ${PC_BDW_GC_LIBRARY_DIRS})
  # OpenSolaris uses bgc as Boehm GC runtime in its package manager. so try it
  if(NOT BOEHM_GC_LIBRARIES)
    find_library(
      BOEHM_GC_LIBRARIES
      NAMES bgc
      HINTS ${PC_BDW_GC_LIBDIR} ${PC_BDW_GC_LIBRARY_DIRS})
  endif()
endif()

message(STATUS "Found GC library: ${BOEHM_GC_LIBRARIES}")

include(FindPackageHandleStandardArgs)
find_package_handle_standard_args(Boehm_GC DEFAULT_MSG BOEHM_GC_LIBRARIES
                                  BOEHM_GC_INCLUDE_DIR)

mark_as_advanced(BOEHM_GC_LIBRARIES BOEHM_GC_INCLUDE_DIR)