You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
217 lines
6.9 KiB
217 lines
6.9 KiB
#.rst:
|
|
# FindThreads
|
|
# -----------
|
|
#
|
|
# This module determines the thread library of the system.
|
|
#
|
|
# The following variables are set
|
|
#
|
|
# ::
|
|
#
|
|
# CMAKE_THREAD_LIBS_INIT - the thread library
|
|
# CMAKE_USE_SPROC_INIT - are we using sproc?
|
|
# CMAKE_USE_WIN32_THREADS_INIT - using WIN32 threads?
|
|
# CMAKE_USE_PTHREADS_INIT - are we using pthreads
|
|
# CMAKE_HP_PTHREADS_INIT - are we using hp pthreads
|
|
#
|
|
# The following import target is created
|
|
#
|
|
# ::
|
|
#
|
|
# Threads::Threads
|
|
#
|
|
# For systems with multiple thread libraries, caller can set
|
|
#
|
|
# ::
|
|
#
|
|
# CMAKE_THREAD_PREFER_PTHREAD
|
|
#
|
|
# If the use of the -pthread compiler and linker flag is prefered then the
|
|
# caller can set
|
|
#
|
|
# ::
|
|
#
|
|
# THREADS_PREFER_PTHREAD_FLAG
|
|
#
|
|
# Please note that the compiler flag can only be used with the imported
|
|
# target. Use of both the imported target as well as this switch is highly
|
|
# recommended for new code.
|
|
|
|
#=============================================================================
|
|
# Copyright 2002-2009 Kitware, Inc.
|
|
# Copyright 2011-2014 Rolf Eike Beer <eike@sf-mail.de>
|
|
#
|
|
# Distributed under the OSI-approved BSD License (the "License");
|
|
# see accompanying file Copyright.txt for details.
|
|
#
|
|
# This software is distributed WITHOUT ANY WARRANTY; without even the
|
|
# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
|
|
# See the License for more information.
|
|
#=============================================================================
|
|
# (To distribute this file outside of CMake, substitute the full
|
|
# License text for the above reference.)
|
|
|
|
include (CheckIncludeFiles)
|
|
include (CheckLibraryExists)
|
|
include (CheckSymbolExists)
|
|
set(Threads_FOUND FALSE)
|
|
set(CMAKE_REQUIRED_QUIET_SAVE ${CMAKE_REQUIRED_QUIET})
|
|
set(CMAKE_REQUIRED_QUIET ${Threads_FIND_QUIETLY})
|
|
|
|
# Do we have sproc?
|
|
if(CMAKE_SYSTEM_NAME MATCHES IRIX AND NOT CMAKE_THREAD_PREFER_PTHREAD)
|
|
CHECK_INCLUDE_FILES("sys/types.h;sys/prctl.h" CMAKE_HAVE_SPROC_H)
|
|
endif()
|
|
|
|
# Internal helper macro.
|
|
# Do NOT even think about using it outside of this file!
|
|
macro(_check_threads_lib LIBNAME FUNCNAME VARNAME)
|
|
if(NOT Threads_FOUND)
|
|
CHECK_LIBRARY_EXISTS(${LIBNAME} ${FUNCNAME} "" ${VARNAME})
|
|
if(${VARNAME})
|
|
set(CMAKE_THREAD_LIBS_INIT "-l${LIBNAME}")
|
|
set(CMAKE_HAVE_THREADS_LIBRARY 1)
|
|
set(Threads_FOUND TRUE)
|
|
endif()
|
|
endif ()
|
|
endmacro()
|
|
|
|
# Internal helper macro.
|
|
# Do NOT even think about using it outside of this file!
|
|
macro(_check_pthreads_flag)
|
|
if(NOT Threads_FOUND)
|
|
# If we did not found -lpthread, -lpthread, or -lthread, look for -pthread
|
|
if(NOT DEFINED THREADS_HAVE_PTHREAD_ARG)
|
|
message(STATUS "Check if compiler accepts -pthread")
|
|
try_run(THREADS_PTHREAD_ARG THREADS_HAVE_PTHREAD_ARG
|
|
${CMAKE_BINARY_DIR}
|
|
${CMAKE_CURRENT_LIST_DIR}/CheckForPthreads.c
|
|
CMAKE_FLAGS -DLINK_LIBRARIES:STRING=-pthread
|
|
COMPILE_OUTPUT_VARIABLE OUTPUT)
|
|
|
|
if(THREADS_HAVE_PTHREAD_ARG)
|
|
if(THREADS_PTHREAD_ARG STREQUAL "2")
|
|
set(Threads_FOUND TRUE)
|
|
message(STATUS "Check if compiler accepts -pthread - yes")
|
|
else()
|
|
message(STATUS "Check if compiler accepts -pthread - no")
|
|
file(APPEND
|
|
${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
|
|
"Determining if compiler accepts -pthread returned ${THREADS_PTHREAD_ARG} instead of 2. The compiler had the following output:\n${OUTPUT}\n\n")
|
|
endif()
|
|
else()
|
|
message(STATUS "Check if compiler accepts -pthread - no")
|
|
file(APPEND
|
|
${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
|
|
"Determining if compiler accepts -pthread failed with the following output:\n${OUTPUT}\n\n")
|
|
endif()
|
|
|
|
endif()
|
|
|
|
if(THREADS_HAVE_PTHREAD_ARG)
|
|
set(Threads_FOUND TRUE)
|
|
set(CMAKE_THREAD_LIBS_INIT "-pthread")
|
|
endif()
|
|
endif()
|
|
endmacro()
|
|
|
|
if(CMAKE_HAVE_SPROC_H AND NOT CMAKE_THREAD_PREFER_PTHREAD)
|
|
# We have sproc
|
|
set(CMAKE_USE_SPROC_INIT 1)
|
|
else()
|
|
# Do we have pthreads?
|
|
CHECK_INCLUDE_FILES("pthread.h" CMAKE_HAVE_PTHREAD_H)
|
|
if(CMAKE_HAVE_PTHREAD_H)
|
|
|
|
#
|
|
# We have pthread.h
|
|
# Let's check for the library now.
|
|
#
|
|
set(CMAKE_HAVE_THREADS_LIBRARY)
|
|
if(NOT THREADS_HAVE_PTHREAD_ARG)
|
|
# Check if pthread functions are in normal C library
|
|
CHECK_SYMBOL_EXISTS(pthread_create pthread.h CMAKE_HAVE_LIBC_CREATE)
|
|
if(CMAKE_HAVE_LIBC_CREATE)
|
|
set(CMAKE_THREAD_LIBS_INIT "")
|
|
set(CMAKE_HAVE_THREADS_LIBRARY 1)
|
|
set(Threads_FOUND TRUE)
|
|
else()
|
|
|
|
# Check for -pthread first if enabled. This is the recommended
|
|
# way, but not backwards compatible as one must also pass -pthread
|
|
# as compiler flag then.
|
|
if (THREADS_PREFER_PTHREAD_FLAG)
|
|
_check_pthreads_flag()
|
|
endif ()
|
|
|
|
_check_threads_lib(pthreads pthread_create CMAKE_HAVE_PTHREADS_CREATE)
|
|
_check_threads_lib(pthread pthread_create CMAKE_HAVE_PTHREAD_CREATE)
|
|
if(CMAKE_SYSTEM_NAME MATCHES "SunOS")
|
|
# On sun also check for -lthread
|
|
_check_threads_lib(thread thr_create CMAKE_HAVE_THR_CREATE)
|
|
endif()
|
|
endif()
|
|
endif()
|
|
|
|
_check_pthreads_flag()
|
|
endif()
|
|
endif()
|
|
|
|
if(CMAKE_THREAD_LIBS_INIT OR CMAKE_HAVE_LIBC_CREATE)
|
|
set(CMAKE_USE_PTHREADS_INIT 1)
|
|
set(Threads_FOUND TRUE)
|
|
endif()
|
|
|
|
if(CMAKE_SYSTEM_NAME MATCHES "Windows")
|
|
set(CMAKE_USE_WIN32_THREADS_INIT 1)
|
|
set(Threads_FOUND TRUE)
|
|
endif()
|
|
|
|
if(CMAKE_USE_PTHREADS_INIT)
|
|
if(CMAKE_SYSTEM_NAME MATCHES "HP-UX")
|
|
# Use libcma if it exists and can be used. It provides more
|
|
# symbols than the plain pthread library. CMA threads
|
|
# have actually been deprecated:
|
|
# http://docs.hp.com/en/B3920-90091/ch12s03.html#d0e11395
|
|
# http://docs.hp.com/en/947/d8.html
|
|
# but we need to maintain compatibility here.
|
|
# The CMAKE_HP_PTHREADS setting actually indicates whether CMA threads
|
|
# are available.
|
|
CHECK_LIBRARY_EXISTS(cma pthread_attr_create "" CMAKE_HAVE_HP_CMA)
|
|
if(CMAKE_HAVE_HP_CMA)
|
|
set(CMAKE_THREAD_LIBS_INIT "-lcma")
|
|
set(CMAKE_HP_PTHREADS_INIT 1)
|
|
set(Threads_FOUND TRUE)
|
|
endif()
|
|
set(CMAKE_USE_PTHREADS_INIT 1)
|
|
endif()
|
|
|
|
if(CMAKE_SYSTEM MATCHES "OSF1-V")
|
|
set(CMAKE_USE_PTHREADS_INIT 0)
|
|
set(CMAKE_THREAD_LIBS_INIT )
|
|
endif()
|
|
|
|
if(CMAKE_SYSTEM MATCHES "CYGWIN_NT")
|
|
set(CMAKE_USE_PTHREADS_INIT 1)
|
|
set(Threads_FOUND TRUE)
|
|
set(CMAKE_THREAD_LIBS_INIT )
|
|
set(CMAKE_USE_WIN32_THREADS_INIT 0)
|
|
endif()
|
|
endif()
|
|
|
|
set(CMAKE_REQUIRED_QUIET ${CMAKE_REQUIRED_QUIET_SAVE})
|
|
include(${CMAKE_CURRENT_LIST_DIR}/FindPackageHandleStandardArgs.cmake)
|
|
FIND_PACKAGE_HANDLE_STANDARD_ARGS(Threads DEFAULT_MSG Threads_FOUND)
|
|
|
|
if(THREADS_FOUND AND NOT TARGET Threads::Threads)
|
|
add_library(Threads::Threads INTERFACE IMPORTED)
|
|
|
|
if(THREADS_HAVE_PTHREAD_ARG)
|
|
set_property(TARGET Threads::Threads PROPERTY INTERFACE_COMPILE_OPTIONS "-pthread")
|
|
endif()
|
|
|
|
if(CMAKE_THREAD_LIBS_INIT)
|
|
set_property(TARGET Threads::Threads PROPERTY INTERFACE_LINK_LIBRARIES "${CMAKE_THREAD_LIBS_INIT}")
|
|
endif()
|
|
endif()
|