CMake/Modules/FindThreads.cmake

# This module determines the thread library of the system.
# The following variables are set
# CMAKE_THREAD_LIBS_INIT        - the thread library to link into an application (-lpthread )
# CMAKE_USE_SPROC_INIT          - are we using sproc?
# CMAKE_USE_WIN32_THREADS_INIT  - are we using WIN32 threads
# CMAKE_USE_PTHREADS_INIT       - are we using pthreads
# CMAKE_HP_PTHREADS_INIT             - are we using hp pthreads

INCLUDE (${CMAKE_ROOT}/Modules/CheckIncludeFile.cmake)
INCLUDE (${CMAKE_ROOT}/Modules/CheckLibraryExists.cmake)

IF(CMAKE_SYSTEM MATCHES IRIX)
  CHECK_INCLUDE_FILE("sys/prctl.h"  CMAKE_HAVE_SPROC_H)
ENDIF(CMAKE_SYSTEM MATCHES IRIX)

CHECK_INCLUDE_FILE("pthread.h" CMAKE_HAVE_PTHREAD_H)
IF(CMAKE_HAVE_PTHREAD_H)
  IF(NOT CMAKE_HAVE_SPROC_H)
    CHECK_LIBRARY_EXISTS(pthreads pthread_create "" CMAKE_HAVE_PTHREADS_CREATE)
    IF(CMAKE_HAVE_PTHREADS_CREATE)
      SET(CMAKE_THREAD_LIBS_INIT "-lpthreads")
    ENDIF(CMAKE_HAVE_PTHREADS_CREATE)
    CHECK_LIBRARY_EXISTS(pthread pthread_create "" CMAKE_HAVE_PTHREAD_CREATE)
    IF(CMAKE_HAVE_PTHREAD_CREATE)
      SET(CMAKE_THREAD_LIBS_INIT "-lpthread")
    ENDIF(CMAKE_HAVE_PTHREAD_CREATE)
    IF(CMAKE_SYSTEM MATCHES "SunOS.*")
      CHECK_LIBRARY_EXISTS(thread thr_create "" CMAKE_HAVE_THR_CREATE)
      IF(CMAKE_HAVE_THR_CREATE)
        SET(CMAKE_THREAD_LIBS_INIT "-lthread")
      ENDIF(CMAKE_HAVE_THR_CREATE)
    ENDIF(CMAKE_SYSTEM MATCHES "SunOS.*")
  ENDIF(NOT CMAKE_HAVE_SPROC_H)
ENDIF(CMAKE_HAVE_PTHREAD_H)

IF(CMAKE_HAVE_SPROC_H)
  SET(CMAKE_USE_SPROC_INIT 1)
ENDIF(CMAKE_HAVE_SPROC_H)
IF(CMAKE_THREAD_LIBS_INIT)
  SET(CMAKE_USE_PTHREADS_INIT 1)
ENDIF(CMAKE_THREAD_LIBS_INIT)

IF(CMAKE_SYSTEM MATCHES "Windows")
  SET(CMAKE_USE_WIN32_THREADS_INIT 1)
ENDIF(CMAKE_SYSTEM MATCHES "Windows")

IF(CMAKE_USE_PTHREADS_INIT)
  IF(CMAKE_SYSTEM MATCHES "HP-UX-*")
    SET(CMAKE_THREAD_LIBS_INIT "-lcma")
    SET(CMAKE_USE_PTHREADS_INIT 1)
    SET(CMAKE_HP_PTHREADS_INIT 1)
  ENDIF(CMAKE_SYSTEM MATCHES "HP-UX-*")

  IF(CMAKE_SYSTEM MATCHES "OSF1-V*")
    SET(CMAKE_USE_PTHREADS_INIT 0)
    SET(CMAKE_THREAD_LIBS_INIT )
  ENDIF(CMAKE_SYSTEM MATCHES "OSF1-V*")

  IF(CMAKE_SYSTEM MATCHES "FreeBSD*")
    SET(CMAKE_USE_PTHREADS_INIT 0)
    SET(CMAKE_THREAD_LIBS_INIT )
  ENDIF(CMAKE_SYSTEM MATCHES "FreeBSD*")

  IF(CMAKE_SYSTEM MATCHES "CYGWIN_NT*")
    SET(CMAKE_USE_PTHREADS_INIT 1)
    SET(CMAKE_THREAD_LIBS_INIT )
    SET(CMAKE_USE_WIN32_THREADS_INIT 0)
  ENDIF(CMAKE_SYSTEM MATCHES "CYGWIN_NT*")
ENDIF(CMAKE_USE_PTHREADS_INIT)