202 lines
6.3 KiB
CMake
202 lines
6.3 KiB
CMake
#.rst:
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# FindThreads
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# -----------
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#
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# This module determines the thread library of the system.
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#
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# The following import target is created
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#
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# ::
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#
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# CMake::Threads
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#
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# The following variables are set
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#
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# ::
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#
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# THREADS_FOUND
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# THREADS_LIBRARIES
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# THREADS_DEFINITIONS
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#
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# Legacy variables
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#
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# ::
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#
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# CMAKE_THREAD_LIBS_INIT - the thread library
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# CMAKE_THREAD_DEFS_INIT - the thread compile definitions
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# CMAKE_USE_SPROC_INIT - are we using sproc?
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# CMAKE_USE_WIN32_THREADS_INIT - using WIN32 threads?
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# CMAKE_USE_PTHREADS_INIT - are we using pthreads
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# CMAKE_HP_PTHREADS_INIT - are we using hp pthreads
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#
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# For systems with multiple thread libraries, caller can set
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#
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# ::
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#
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# CMAKE_THREAD_PREFER_PTHREAD
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#=============================================================================
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# Copyright 2002-2014 Kitware, Inc.
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#
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# Distributed under the OSI-approved BSD License (the "License");
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# see accompanying file Copyright.txt for details.
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#
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# This software is distributed WITHOUT ANY WARRANTY; without even the
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# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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# See the License for more information.
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#=============================================================================
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# (To distribute this file outside of CMake, substitute the full
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# License text for the above reference.)
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include(CheckIncludeFiles)
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include(CheckLibraryExists)
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include(CheckSymbolExists)
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set(Threads_FOUND FALSE)
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set(CMAKE_REQUIRED_QUIET_SAVE ${CMAKE_REQUIRED_QUIET})
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set(CMAKE_REQUIRED_QUIET ${Threads_FIND_QUIETLY})
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# Do we have sproc?
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if(CMAKE_SYSTEM_NAME MATCHES IRIX AND NOT CMAKE_THREAD_PREFER_PTHREAD)
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check_include_files("sys/types.h;sys/prctl.h" CMAKE_HAVE_SPROC_H)
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endif()
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if(CMAKE_HAVE_SPROC_H AND NOT CMAKE_THREAD_PREFER_PTHREAD)
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# We have sproc
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set(CMAKE_USE_SPROC_INIT 1)
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else()
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# Do we have pthreads?
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check_include_files("pthread.h" CMAKE_HAVE_PTHREAD_H)
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if(CMAKE_HAVE_PTHREAD_H)
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#
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# We have pthread.h
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# Let's check for the library now.
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#
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set(CMAKE_HAVE_THREADS_LIBRARY)
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# Check if pthread functions are in normal C library
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check_symbol_exists(pthread_create pthread.h CMAKE_HAVE_LIBC_CREATE)
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if(CMAKE_HAVE_LIBC_CREATE)
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set(CMAKE_THREAD_LIBS_INIT "")
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set(CMAKE_HAVE_THREADS_LIBRARY 1)
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set(Threads_FOUND TRUE)
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endif()
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if(NOT Threads_FOUND AND NOT THREADS_HAVE_PTHREAD_ARG)
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message(STATUS "Check if compiler accepts -pthread")
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try_run(THREADS_PTHREAD_ARG THREADS_HAVE_PTHREAD_ARG
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${CMAKE_BINARY_DIR}
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${CMAKE_CURRENT_LIST_DIR}/CheckForPthreads.c
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COMPILE_DEFINITIONS -pthread
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CMAKE_FLAGS -DLINK_LIBRARIES:STRING=-pthread
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COMPILE_OUTPUT_VARIABLE OUTPUT)
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if(THREADS_HAVE_PTHREAD_ARG)
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if(THREADS_PTHREAD_ARG STREQUAL "2")
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message(STATUS "Check if compiler accepts -pthread - yes")
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else()
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message(STATUS "Check if compiler accepts -pthread - no")
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file(APPEND
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${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
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"Determining if compiler accepts -pthread returned ${THREADS_PTHREAD_ARG} instead of 2. The compiler had the following output:\n${OUTPUT}\n\n")
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set(THREADS_HAVE_PTHREAD_ARG)
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endif()
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else()
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message(STATUS "Check if compiler accepts -pthread - no")
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file(APPEND
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${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
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"Determining if compiler accepts -pthread failed with the following output:\n${OUTPUT}\n\n")
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endif()
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endif()
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if(NOT Threads_FOUND AND THREADS_HAVE_PTHREAD_ARG)
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set(Threads_FOUND TRUE)
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set(CMAKE_THREAD_LIBS_INIT "-pthread")
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set(CMAKE_THREAD_DEFS_INIT "-pthread")
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endif()
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if(NOT Threads_FOUND)
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if(NOT CMAKE_HAVE_THREADS_LIBRARY)
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# Do we have -lpthreads
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check_library_exists(pthreads pthread_create "" CMAKE_HAVE_PTHREADS_CREATE)
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if(CMAKE_HAVE_PTHREADS_CREATE)
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set(CMAKE_THREAD_LIBS_INIT "-lpthreads")
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set(CMAKE_HAVE_THREADS_LIBRARY 1)
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set(Threads_FOUND TRUE)
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endif()
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# Ok, how about -lpthread
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check_library_exists(pthread pthread_create "" CMAKE_HAVE_PTHREAD_CREATE)
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if(CMAKE_HAVE_PTHREAD_CREATE)
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set(CMAKE_THREAD_LIBS_INIT "-lpthread")
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set(CMAKE_HAVE_THREADS_LIBRARY 1)
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set(Threads_FOUND TRUE)
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endif()
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if(CMAKE_SYSTEM MATCHES "SunOS.*")
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# On sun also check for -lthread
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check_library_exists(thread thr_create "" CMAKE_HAVE_THR_CREATE)
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if(CMAKE_HAVE_THR_CREATE)
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set(CMAKE_THREAD_LIBS_INIT "-lthread")
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set(CMAKE_HAVE_THREADS_LIBRARY 1)
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set(Threads_FOUND TRUE)
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endif()
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endif()
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endif()
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endif()
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endif()
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endif()
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if(CMAKE_THREAD_LIBS_INIT OR CMAKE_HAVE_LIBC_CREATE)
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set(CMAKE_USE_PTHREADS_INIT 1)
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set(Threads_FOUND TRUE)
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endif()
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if(CMAKE_SYSTEM_NAME MATCHES "Windows")
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set(CMAKE_USE_WIN32_THREADS_INIT 1)
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set(Threads_FOUND TRUE)
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endif()
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if(CMAKE_USE_PTHREADS_INIT)
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if(CMAKE_SYSTEM_NAME MATCHES "HP-UX")
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# Use libcma if it exists and can be used. It provides more
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# symbols than the plain pthread library. CMA threads
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# have actually been deprecated:
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# http://docs.hp.com/en/B3920-90091/ch12s03.html#d0e11395
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# http://docs.hp.com/en/947/d8.html
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# but we need to maintain compatibility here.
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# The CMAKE_HP_PTHREADS setting actually indicates whether CMA threads
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# are available.
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check_library_exists(cma pthread_attr_create "" CMAKE_HAVE_HP_CMA)
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if(CMAKE_HAVE_HP_CMA)
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set(CMAKE_THREAD_LIBS_INIT "-lcma")
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set(CMAKE_HP_PTHREADS_INIT 1)
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set(Threads_FOUND TRUE)
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endif()
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set(CMAKE_USE_PTHREADS_INIT 1)
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endif()
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if(CMAKE_SYSTEM MATCHES "OSF1-V")
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set(CMAKE_USE_PTHREADS_INIT 0)
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set(CMAKE_THREAD_LIBS_INIT )
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endif()
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if(CMAKE_SYSTEM MATCHES "CYGWIN_NT")
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set(CMAKE_USE_PTHREADS_INIT 1)
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set(Threads_FOUND TRUE)
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set(CMAKE_THREAD_LIBS_INIT )
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set(CMAKE_USE_WIN32_THREADS_INIT 0)
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endif()
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endif()
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set(CMAKE_REQUIRED_QUIET ${CMAKE_REQUIRED_QUIET_SAVE})
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include(FindPackageHandleStandardArgs)
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find_package_handle_standard_args(Threads DEFAULT_MSG Threads_FOUND)
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if(THREADS_FOUND)
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set(THREADS_LIBRARIES "${CMAKE_THREAD_LIBS_INIT}")
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set(THREADS_DEFINITIONS "${CMAKE_THREAD_DEFS_INIT}")
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endif()
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