Modules/FindThreads.cmake

   1 # - This module determines the thread library of the system.
   2 # The following variables are set
   3 #  CMAKE_THREAD_LIBS_INIT     - the thread library
   4 #  CMAKE_USE_SPROC_INIT       - are we using sproc?
   5 #  CMAKE_USE_WIN32_THREADS_INIT - using WIN32 threads?
   6 #  CMAKE_USE_PTHREADS_INIT    - are we using pthreads
   7 #  CMAKE_HP_PTHREADS_INIT     - are we using hp pthreads
   8
   9 INCLUDE (CheckIncludeFiles)
  10 INCLUDE (CheckLibraryExists)
  11 SET(Threads_FOUND FALSE)
  12
  13 # Do we have sproc?
  14 IF(CMAKE_SYSTEM MATCHES IRIX)
  15   CHECK_INCLUDE_FILES("sys/types.h;sys/prctl.h"  CMAKE_HAVE_SPROC_H)
  16 ENDIF(CMAKE_SYSTEM MATCHES IRIX)
  17
  18 IF(CMAKE_HAVE_SPROC_H)
  19   # We have sproc
  20   SET(CMAKE_USE_SPROC_INIT 1)
  21 ELSE(CMAKE_HAVE_SPROC_H)
  22   # Do we have pthreads?
  23   CHECK_INCLUDE_FILES("pthread.h" CMAKE_HAVE_PTHREAD_H)
  24   IF(CMAKE_HAVE_PTHREAD_H)
  25     # We have pthread.h
  26     # Let's check for the library now.
  27     SET(CMAKE_HAVE_THREADS_LIBRARY)
  28     IF(NOT THREADS_HAVE_PTHREAD_ARG)
  29       # Do we have -lpthreads
  30       CHECK_LIBRARY_EXISTS(pthreads pthread_create "" CMAKE_HAVE_PTHREADS_CREATE)
  31       IF(CMAKE_HAVE_PTHREADS_CREATE)
  32         SET(CMAKE_THREAD_LIBS_INIT "-lpthreads")
  33         SET(CMAKE_HAVE_THREADS_LIBRARY 1)
  34         SET(Threads_FOUND TRUE)
  35       ENDIF(CMAKE_HAVE_PTHREADS_CREATE)
  36       # Ok, how about -lpthread
  37       CHECK_LIBRARY_EXISTS(pthread pthread_create "" CMAKE_HAVE_PTHREAD_CREATE)
  38       IF(CMAKE_HAVE_PTHREAD_CREATE)
  39         SET(CMAKE_THREAD_LIBS_INIT "-lpthread")
  40         SET(Threads_FOUND TRUE)
  41         SET(CMAKE_HAVE_THREADS_LIBRARY 1)
  42       ENDIF(CMAKE_HAVE_PTHREAD_CREATE)
  43       IF(CMAKE_SYSTEM MATCHES "SunOS.*")
  44         # On sun also check for -lthread
  45         CHECK_LIBRARY_EXISTS(thread thr_create "" CMAKE_HAVE_THR_CREATE)
  46         IF(CMAKE_HAVE_THR_CREATE)
  47           SET(CMAKE_THREAD_LIBS_INIT "-lthread")
  48           SET(CMAKE_HAVE_THREADS_LIBRARY 1)
  49           SET(Threads_FOUND TRUE)
  50         ENDIF(CMAKE_HAVE_THR_CREATE)
  51       ENDIF(CMAKE_SYSTEM MATCHES "SunOS.*")
  52     ENDIF(NOT THREADS_HAVE_PTHREAD_ARG)
  53
  54     IF(NOT CMAKE_HAVE_THREADS_LIBRARY)
  55       # If we did not found -lpthread, -lpthread, or -lthread, look for -pthread
  56       IF("THREADS_HAVE_PTHREAD_ARG" MATCHES "^THREADS_HAVE_PTHREAD_ARG")
  57         MESSAGE(STATUS "Check if compiler accepts -pthread")
  58         TRY_RUN(THREADS_PTHREAD_ARG THREADS_HAVE_PTHREAD_ARG
  59           ${CMAKE_BINARY_DIR}
  60           ${CMAKE_ROOT}/Modules/CheckForPthreads.c
  61           CMAKE_FLAGS -DLINK_LIBRARIES:STRING=-pthread
  62           COMPILE_OUTPUT_VARIABLE OUTPUT)
  63         IF(THREADS_HAVE_PTHREAD_ARG)
  64           IF(THREADS_PTHREAD_ARG MATCHES "^2$")
  65             SET(Threads_FOUND TRUE)
  66             MESSAGE(STATUS "Check if compiler accepts -pthread - yes")
  67           ELSE(THREADS_PTHREAD_ARG MATCHES "^2$")
  68             MESSAGE(STATUS "Check if compiler accepts -pthread - no")
  69             FILE(APPEND
  70               ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
  71               "Determining if compiler accepts -pthread returned ${THREADS_PTHREAD_ARG} instead of 2. The compiler had the following output:\n${OUTPUT}\n\n")
  72           ENDIF(THREADS_PTHREAD_ARG MATCHES "^2$")
  73         ELSE(THREADS_HAVE_PTHREAD_ARG)
  74           MESSAGE(STATUS "Check if compiler accepts -pthread - no")
  75           FILE(APPEND
  76             ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
  77             "Determining if compiler accepts -pthread failed with the following output:\n${OUTPUT}\n\n")
  78         ENDIF(THREADS_HAVE_PTHREAD_ARG)
  79       ENDIF("THREADS_HAVE_PTHREAD_ARG" MATCHES "^THREADS_HAVE_PTHREAD_ARG")
  80       IF(THREADS_HAVE_PTHREAD_ARG)
  81         SET(Threads_FOUND TRUE)
  82         SET(CMAKE_THREAD_LIBS_INIT "-pthread")
  83       ENDIF(THREADS_HAVE_PTHREAD_ARG)
  84     ENDIF(NOT CMAKE_HAVE_THREADS_LIBRARY)
  85   ENDIF(CMAKE_HAVE_PTHREAD_H)
  86 ENDIF(CMAKE_HAVE_SPROC_H)
  87
  88 IF(CMAKE_THREAD_LIBS_INIT)
  89   SET(CMAKE_USE_PTHREADS_INIT 1)
  90   SET(Threads_FOUND TRUE)
  91 ENDIF(CMAKE_THREAD_LIBS_INIT)
  92
  93 IF(CMAKE_SYSTEM MATCHES "Windows")
  94   SET(CMAKE_USE_WIN32_THREADS_INIT 1)
  95   SET(Threads_FOUND TRUE)
  96 ENDIF(CMAKE_SYSTEM MATCHES "Windows")
  97
  98 IF(CMAKE_USE_PTHREADS_INIT)
  99   IF(CMAKE_SYSTEM MATCHES "HP-UX-*")
 100     # Use libcma if it exists and can be used.  It provides more
 101     # symbols than the plain pthread library.  CMA threads
 102     # have actually been deprecated:
 103     #   http://docs.hp.com/en/B3920-90091/ch12s03.html#d0e11395
 104     #   http://docs.hp.com/en/947/d8.html
 105     # but we need to maintain compatibility here.
 106     # The CMAKE_HP_PTHREADS setting actually indicates whether CMA threads
 107     # are available.
 108     CHECK_LIBRARY_EXISTS(cma pthread_attr_create "" CMAKE_HAVE_HP_CMA)
 109     IF(CMAKE_HAVE_HP_CMA)
 110       SET(CMAKE_THREAD_LIBS_INIT "-lcma")
 111       SET(CMAKE_HP_PTHREADS_INIT 1)
 112       SET(Threads_FOUND TRUE)
 113     ENDIF(CMAKE_HAVE_HP_CMA)
 114     SET(CMAKE_USE_PTHREADS_INIT 1)
 115   ENDIF(CMAKE_SYSTEM MATCHES "HP-UX-*")
 116
 117   IF(CMAKE_SYSTEM MATCHES "OSF1-V*")
 118     SET(CMAKE_USE_PTHREADS_INIT 0)
 119     SET(CMAKE_THREAD_LIBS_INIT )
 120   ENDIF(CMAKE_SYSTEM MATCHES "OSF1-V*")
 121
 122   IF(CMAKE_SYSTEM MATCHES "CYGWIN_NT*")
 123     SET(CMAKE_USE_PTHREADS_INIT 1)
 124     SET(Threads_FOUND TRUE)
 125     SET(CMAKE_THREAD_LIBS_INIT )
 126     SET(CMAKE_USE_WIN32_THREADS_INIT 0)
 127   ENDIF(CMAKE_SYSTEM MATCHES "CYGWIN_NT*")
 128 ENDIF(CMAKE_USE_PTHREADS_INIT)
 129
 130 INCLUDE(FindPackageHandleStandardArgs)
 131 FIND_PACKAGE_HANDLE_STANDARD_ARGS(Threads DEFAULT_MSG Threads_FOUND)