cmake/FindPthreads.cmake

   1 # - Find the Pthreads library
   2 # This module searches for the Pthreads library (including the
   3 # pthreads-win32 port).
   4 #
   5 # This module defines these variables:
   6 #
   7 #  PTHREADS_FOUND
   8 #      True if the Pthreads library was found
   9 #  PTHREADS_LIBRARY
  10 #      The location of the Pthreads library
  11 #  PTHREADS_INCLUDE_DIR
  12 #      The include path of the Pthreads library
  13 #  PTHREADS_DEFINITIONS
  14 #      Preprocessor definitions to define
  15 #
  16 # This module responds to the PTHREADS_EXCEPTION_SCHEME
  17 # variable on Win32 to allow the user to control the
  18 # library linked against.  The Pthreads-win32 port
  19 # provides the ability to link against a version of the
  20 # library with exception handling.  IT IS NOT RECOMMENDED
  21 # THAT YOU USE THIS because most POSIX thread implementations
  22 # do not support stack unwinding.
  23 #
  24 #  PTHREADS_EXCEPTION_SCHEME
  25 #      C  = no exceptions (default)
  26 #         (NOTE: This is the default scheme on most POSIX thread
  27 #          implementations and what you should probably be using)
  28 #      CE = C++ Exception Handling
  29 #      SE = Structure Exception Handling (MSVC only)
  30 #
  31
  32 #
  33 # Define a default exception scheme to link against
  34 # and validate user choice.
  35 #
  36 IF(PTHREADS_INCLUDE_DIR)
  37   # Already in cache, be silent
  38   SET(PTHREADS_FIND_QUIETLY TRUE)
  39 ENDIF(PTHREADS_INCLUDE_DIR)
  40
  41
  42 IF(NOT DEFINED PTHREADS_EXCEPTION_SCHEME)
  43     # Assign default if needed
  44     SET(PTHREADS_EXCEPTION_SCHEME "C")
  45 ELSE(NOT DEFINED PTHREADS_EXCEPTION_SCHEME)
  46     # Validate
  47     IF(NOT PTHREADS_EXCEPTION_SCHEME STREQUAL "C" AND
  48        NOT PTHREADS_EXCEPTION_SCHEME STREQUAL "CE" AND
  49        NOT PTHREADS_EXCEPTION_SCHEME STREQUAL "SE")
  50
  51     MESSAGE(FATAL_ERROR "See documentation for FindPthreads.cmake, only C, CE, and SE modes are allowed")
  52
  53     ENDIF(NOT PTHREADS_EXCEPTION_SCHEME STREQUAL "C" AND
  54           NOT PTHREADS_EXCEPTION_SCHEME STREQUAL "CE" AND
  55           NOT PTHREADS_EXCEPTION_SCHEME STREQUAL "SE")
  56
  57      IF(NOT MSVC AND PTHREADS_EXCEPTION_SCHEME STREQUAL "SE")
  58          MESSAGE(FATAL_ERROR "Structured Exception Handling is only allowed for MSVC")
  59      ENDIF(NOT MSVC AND PTHREADS_EXCEPTION_SCHEME STREQUAL "SE")
  60
  61 ENDIF(NOT DEFINED PTHREADS_EXCEPTION_SCHEME)
  62
  63 #
  64 # Find the header file
  65 #
  66 FIND_PATH(PTHREADS_INCLUDE_DIR pthread.h)
  67
  68 #
  69 # Find the library
  70 #
  71 SET(names)
  72 IF(MSVC)
  73     SET(names
  74             pthreadV${PTHREADS_EXCEPTION_SCHEME}2
  75             pthread
  76     )
  77 ELSEIF(MINGW)
  78     SET(names
  79             pthreadG${PTHREADS_EXCEPTION_SCHEME}2
  80             pthread
  81     )
  82 ELSE(MSVC) # Unix / Cygwin / Apple
  83     SET(names pthread)
  84 ENDIF(MSVC)
  85
  86 FIND_LIBRARY(PTHREADS_LIBRARY ${names}
  87     DOC "The Portable Threads Library")
  88
  89 IF(PTHREADS_INCLUDE_DIR AND PTHREADS_LIBRARY)
  90     SET(PTHREADS_FOUND true)
  91     SET(PTHREADS_DEFINITIONS -DHAVE_PTHREAD_H)
  92     SET(PTHREADS_INCLUDE_DIRS ${PTHREADS_INCLUDE_DIR})
  93     SET(PTHREADS_LIBRARIES    ${PTHREADS_LIBRARY})
  94 ENDIF(PTHREADS_INCLUDE_DIR AND PTHREADS_LIBRARY)
  95
  96 IF(PTHREADS_FOUND)
  97     IF(NOT PTHREADS_FIND_QUIETLY)
  98         MESSAGE(STATUS "Found Pthreads: ${PTHREADS_LIBRARY}")
  99     ENDIF(NOT PTHREADS_FIND_QUIETLY)
 100 ELSE(PTHREADS_FOUND)
 101     IF(PTHREADS_FIND_REQUIRED)
 102         MESSAGE(FATAL_ERROR "Could not find the Pthreads Library")
 103     ENDIF(PTHREADS_FIND_REQUIRED)
 104 ENDIF(PTHREADS_FOUND)