cmake_modules/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 directory of the Pthreads library
  13 #  PTHREADS_DEFINITIONS
  14 #      Preprocessor definitions to define (HAVE_PTHREAD_H is a fairly common
  15 #      one)
  16 #
  17 # This module responds to the PTHREADS_EXCEPTION_SCHEME
  18 # variable on Win32 to allow the user to control the
  19 # library linked against.  The Pthreads-win32 port
  20 # provides the ability to link against a version of the
  21 # library with exception handling.  IT IS NOT RECOMMENDED
  22 # THAT YOU CHANGE PTHREADS_EXCEPTION_SCHEME TO ANYTHING OTHER THAN
  23 # "C" because most POSIX thread implementations do not support stack
  24 # unwinding.
  25 #
  26 #  PTHREADS_EXCEPTION_SCHEME
  27 #      C  = no exceptions (default)
  28 #         (NOTE: This is the default scheme on most POSIX thread
  29 #          implementations and what you should probably be using)
  30 #      CE = C++ Exception Handling
  31 #      SE = Structure Exception Handling (MSVC only)
  32 #
  33
  34 #
  35 # Define a default exception scheme to link against
  36 # and validate user choice.
  37 #
  38 IF(NOT DEFINED PTHREADS_EXCEPTION_SCHEME)
  39     # Assign default if needed
  40     SET(PTHREADS_EXCEPTION_SCHEME "C")
  41 ELSE(NOT DEFINED PTHREADS_EXCEPTION_SCHEME)
  42     # Validate
  43     IF(NOT PTHREADS_EXCEPTION_SCHEME STREQUAL "C" AND
  44        NOT PTHREADS_EXCEPTION_SCHEME STREQUAL "CE" AND
  45        NOT PTHREADS_EXCEPTION_SCHEME STREQUAL "SE")
  46
  47     MESSAGE(FATAL_ERROR "See documentation for FindPthreads.cmake, only C, CE, and SE modes are allowed")
  48
  49     ENDIF(NOT PTHREADS_EXCEPTION_SCHEME STREQUAL "C" AND
  50           NOT PTHREADS_EXCEPTION_SCHEME STREQUAL "CE" AND
  51           NOT PTHREADS_EXCEPTION_SCHEME STREQUAL "SE")
  52
  53      IF(NOT MSVC AND PTHREADS_EXCEPTION_SCHEME STREQUAL "SE")
  54          MESSAGE(FATAL_ERROR "Structured Exception Handling is only allowed for MSVC")
  55      ENDIF(NOT MSVC AND PTHREADS_EXCEPTION_SCHEME STREQUAL "SE")
  56
  57 ENDIF(NOT DEFINED PTHREADS_EXCEPTION_SCHEME)
  58
  59 #
  60 # Find the header file
  61 #
  62 FIND_PATH(PTHREADS_INCLUDE_DIR pthread.h)
  63
  64 #
  65 # Find the library
  66 #
  67 SET(names)
  68 IF(MSVC)
  69     SET(names
  70             pthreadV${PTHREADS_EXCEPTION_SCHEME}2
  71             pthread
  72     )
  73 ELSEIF(MINGW)
  74     SET(names
  75             pthreadG${PTHREADS_EXCEPTION_SCHEME}2
  76             pthread
  77     )
  78 ELSE(MSVC) # Unix / Cygwin / Apple / Etc.
  79     SET(names pthread)
  80 ENDIF(MSVC)
  81
  82 FIND_LIBRARY(PTHREADS_LIBRARY ${names}
  83     DOC "The Portable Threads Library")
  84
  85 INCLUDE(FindPackageHandleStandardArgs)
  86 FIND_PACKAGE_HANDLE_STANDARD_ARGS(Pthreads DEFAULT_MSG
  87     PTHREADS_LIBRARY PTHREADS_INCLUDE_DIR)
  88
  89 IF(PTHREADS_INCLUDE_DIR AND PTHREADS_LIBRARY)
  90     SET(PTHREADS_DEFINITIONS -DHAVE_PTHREAD_H)
  91     SET(PTHREADS_INCLUDE_DIRS ${PTHREADS_INCLUDE_DIR})
  92     SET(PTHREADS_LIBRARIES    ${PTHREADS_LIBRARY})
  93 ENDIF(PTHREADS_INCLUDE_DIR AND PTHREADS_LIBRARY)
  94
  95 MARK_AS_ADVANCED(PTHREADS_INCLUDE_DIR)
  96 MARK_AS_ADVANCED(PTHREADS_LIBRARY)