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rtl-sdr/cmake/Modules/FindThreads.cmake

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CMake
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# Updated FindThreads.cmake that supports pthread-win32
# Downloaded from http://www.vtk.org/Bug/bug_view_advanced_page.php?bug_id=6399
# - 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
#
# If use of pthreads-win32 is desired, the following variables
# can be set.
#
# THREADS_USE_PTHREADS_WIN32 -
# Setting this to true searches for the pthreads-win32
# port (since CMake 2.8.0)
#
# THREADS_PTHREADS_WIN32_EXCEPTION_SCHEME
# C = no exceptions (default)
# (NOTE: This is the default scheme on most POSIX thread
# implementations and what you should probably be using)
# CE = C++ Exception Handling
# SE = Structure Exception Handling (MSVC only)
# (NOTE: Changing this option from the default may affect
# the portability of your application. See pthreads-win32
# documentation for more details.)
#
#======================================================
# Example usage where threading library
# is provided by the system:
#
# find_package(Threads REQUIRED)
# add_executable(foo foo.cc)
# target_link_libraries(foo ${CMAKE_THREAD_LIBS_INIT})
#
# Example usage if pthreads-win32 is desired on Windows
# or a system provided thread library:
#
# set(THREADS_USE_PTHREADS_WIN32 true)
# find_package(Threads REQUIRED)
# include_directories(${THREADS_PTHREADS_INCLUDE_DIR})
#
# add_executable(foo foo.cc)
# target_link_libraries(foo ${CMAKE_THREAD_LIBS_INIT})
#
INCLUDE (CheckIncludeFiles)
INCLUDE (CheckLibraryExists)
SET(Threads_FOUND FALSE)
IF(WIN32 AND NOT CYGWIN AND THREADS_USE_PTHREADS_WIN32)
SET(_Threads_ptwin32 true)
ENDIF()
# Do we have sproc?
IF(CMAKE_SYSTEM MATCHES IRIX)
CHECK_INCLUDE_FILES("sys/types.h;sys/prctl.h" CMAKE_HAVE_SPROC_H)
ENDIF()
IF(CMAKE_HAVE_SPROC_H)
# We have sproc
SET(CMAKE_USE_SPROC_INIT 1)
ELSEIF(_Threads_ptwin32)
IF(NOT DEFINED THREADS_PTHREADS_WIN32_EXCEPTION_SCHEME)
# Assign the default scheme
SET(THREADS_PTHREADS_WIN32_EXCEPTION_SCHEME "C")
ELSE()
# Validate the scheme specified by the user
IF(NOT THREADS_PTHREADS_WIN32_EXCEPTION_SCHEME STREQUAL "C" AND
NOT THREADS_PTHREADS_WIN32_EXCEPTION_SCHEME STREQUAL "CE" AND
NOT THREADS_PTHREADS_WIN32_EXCEPTION_SCHEME STREQUAL "SE")
MESSAGE(FATAL_ERROR "See documentation for FindPthreads.cmake, only C, CE, and SE modes are allowed")
ENDIF()
IF(NOT MSVC AND THREADS_PTHREADS_WIN32_EXCEPTION_SCHEME STREQUAL "SE")
MESSAGE(FATAL_ERROR "Structured Exception Handling is only allowed for MSVC")
ENDIF(NOT MSVC AND THREADS_PTHREADS_WIN32_EXCEPTION_SCHEME STREQUAL "SE")
ENDIF()
FIND_PATH(THREADS_PTHREADS_INCLUDE_DIR pthread.h)
# Determine the library filename
IF(MSVC)
SET(_Threads_pthreads_libname
pthreadV${THREADS_PTHREADS_WIN32_EXCEPTION_SCHEME}2)
ELSEIF(MINGW)
SET(_Threads_pthreads_libname
pthreadG${THREADS_PTHREADS_WIN32_EXCEPTION_SCHEME}2)
ELSE()
MESSAGE(FATAL_ERROR "This should never happen")
ENDIF()
# Use the include path to help find the library if possible
SET(_Threads_lib_paths "")
IF(THREADS_PTHREADS_INCLUDE_DIR)
GET_FILENAME_COMPONENT(_Threads_root_dir
${THREADS_PTHREADS_INCLUDE_DIR} PATH)
SET(_Threads_lib_paths ${_Threads_root_dir}/lib)
ENDIF()
FIND_LIBRARY(THREADS_PTHREADS_WIN32_LIBRARY
NAMES ${_Threads_pthreads_libname}
PATHS ${_Threads_lib_paths}
DOC "The Portable Threads Library for Win32"
NO_SYSTEM_PATH
)
IF(THREADS_PTHREADS_INCLUDE_DIR AND THREADS_PTHREADS_WIN32_LIBRARY)
MARK_AS_ADVANCED(THREADS_PTHREADS_INCLUDE_DIR)
SET(CMAKE_THREAD_LIBS_INIT ${THREADS_PTHREADS_WIN32_LIBRARY})
SET(CMAKE_HAVE_THREADS_LIBRARY 1)
SET(Threads_FOUND TRUE)
ENDIF()
MARK_AS_ADVANCED(THREADS_PTHREADS_WIN32_LIBRARY)
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)
# Do we have -lpthreads
CHECK_LIBRARY_EXISTS(pthreads pthread_create "" CMAKE_HAVE_PTHREADS_CREATE)
IF(CMAKE_HAVE_PTHREADS_CREATE)
SET(CMAKE_THREAD_LIBS_INIT "-lpthreads")
SET(CMAKE_HAVE_THREADS_LIBRARY 1)
SET(Threads_FOUND TRUE)
ENDIF()
# Ok, how about -lpthread
CHECK_LIBRARY_EXISTS(pthread pthread_create "" CMAKE_HAVE_PTHREAD_CREATE)
IF(CMAKE_HAVE_PTHREAD_CREATE)
SET(CMAKE_THREAD_LIBS_INIT "-lpthread")
SET(Threads_FOUND TRUE)
SET(CMAKE_HAVE_THREADS_LIBRARY 1)
ENDIF()
IF(CMAKE_SYSTEM MATCHES "SunOS.*")
# On sun also check for -lthread
CHECK_LIBRARY_EXISTS(thread thr_create "" CMAKE_HAVE_THR_CREATE)
IF(CMAKE_HAVE_THR_CREATE)
SET(CMAKE_THREAD_LIBS_INIT "-lthread")
SET(CMAKE_HAVE_THREADS_LIBRARY 1)
SET(Threads_FOUND TRUE)
ENDIF()
ENDIF(CMAKE_SYSTEM MATCHES "SunOS.*")
ENDIF(NOT THREADS_HAVE_PTHREAD_ARG)
IF(NOT CMAKE_HAVE_THREADS_LIBRARY)
# If we did not found -lpthread, -lpthread, or -lthread, look for -pthread
IF("THREADS_HAVE_PTHREAD_ARG" MATCHES "^THREADS_HAVE_PTHREAD_ARG")
MESSAGE(STATUS "Check if compiler accepts -pthread")
TRY_RUN(THREADS_PTHREAD_ARG THREADS_HAVE_PTHREAD_ARG
${CMAKE_BINARY_DIR}
${CMAKE_ROOT}/Modules/CheckForPthreads.c
CMAKE_FLAGS -DLINK_LIBRARIES:STRING=-pthread
COMPILE_OUTPUT_VARIABLE OUTPUT)
IF(THREADS_HAVE_PTHREAD_ARG)
IF(THREADS_PTHREAD_ARG MATCHES "^2$")
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("THREADS_HAVE_PTHREAD_ARG" MATCHES "^THREADS_HAVE_PTHREAD_ARG")
IF(THREADS_HAVE_PTHREAD_ARG)
SET(Threads_FOUND TRUE)
SET(CMAKE_THREAD_LIBS_INIT "-pthread")
ENDIF()
ENDIF(NOT CMAKE_HAVE_THREADS_LIBRARY)
ENDIF(CMAKE_HAVE_PTHREAD_H)
ENDIF()
IF(CMAKE_THREAD_LIBS_INIT)
SET(CMAKE_USE_PTHREADS_INIT 1)
SET(Threads_FOUND TRUE)
ENDIF()
IF(CMAKE_SYSTEM MATCHES "Windows"
AND NOT THREADS_USE_PTHREADS_WIN32)
SET(CMAKE_USE_WIN32_THREADS_INIT 1)
SET(Threads_FOUND TRUE)
ENDIF()
IF(CMAKE_USE_PTHREADS_INIT)
IF(CMAKE_SYSTEM 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(CMAKE_HAVE_HP_CMA)
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(CMAKE_USE_PTHREADS_INIT)
INCLUDE(FindPackageHandleStandardArgs)
IF(_Threads_ptwin32)
FIND_PACKAGE_HANDLE_STANDARD_ARGS(Threads DEFAULT_MSG
THREADS_PTHREADS_WIN32_LIBRARY THREADS_PTHREADS_INCLUDE_DIR)
ELSE()
FIND_PACKAGE_HANDLE_STANDARD_ARGS(Threads DEFAULT_MSG Threads_FOUND)
ENDIF()
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