summaryrefslogtreecommitdiff
path: root/Modules/FindThreads.cmake
diff options
context:
space:
mode:
Diffstat (limited to 'Modules/FindThreads.cmake')
-rw-r--r--Modules/FindThreads.cmake234
1 files changed, 146 insertions, 88 deletions
diff --git a/Modules/FindThreads.cmake b/Modules/FindThreads.cmake
index f03908ea0..2c6a58beb 100644
--- a/Modules/FindThreads.cmake
+++ b/Modules/FindThreads.cmake
@@ -1,42 +1,134 @@
-# - This module determines the thread library of the system.
+# Distributed under the OSI-approved BSD 3-Clause License. See accompanying
+# file Copyright.txt or https://cmake.org/licensing for details.
+
+#.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
+#
+# ::
+#
+# 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
-
-#=============================================================================
-# Copyright 2002-2009 Kitware, Inc.
#
-# Distributed under the OSI-approved BSD License (the "License");
-# see accompanying file Copyright.txt for details.
+# ::
+#
+# CMAKE_THREAD_PREFER_PTHREAD
+#
+# If the use of the -pthread compiler and linker flag is preferred then the
+# caller can set
#
-# 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)
+# ::
+#
+# 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.
+
include (CheckLibraryExists)
include (CheckSymbolExists)
set(Threads_FOUND FALSE)
+set(CMAKE_REQUIRED_QUIET_SAVE ${CMAKE_REQUIRED_QUIET})
+set(CMAKE_REQUIRED_QUIET ${Threads_FIND_QUIETLY})
+
+if(CMAKE_C_COMPILER_LOADED)
+ include (CheckIncludeFile)
+elseif(CMAKE_CXX_COMPILER_LOADED)
+ include (CheckIncludeFileCXX)
+else()
+ message(FATAL_ERROR "FindThreads only works if either C or CXX language is enabled")
+endif()
# Do we have sproc?
-if(CMAKE_SYSTEM MATCHES IRIX AND NOT CMAKE_THREAD_PREFER_PTHREAD)
+if(CMAKE_SYSTEM_NAME MATCHES IRIX AND NOT CMAKE_THREAD_PREFER_PTHREAD)
+ include (CheckIncludeFiles)
CHECK_INCLUDE_FILES("sys/types.h;sys/prctl.h" CMAKE_HAVE_SPROC_H)
endif()
+# Internal helper macro.
+# Do NOT even think about using it outside of this file!
+macro(_check_threads_lib LIBNAME FUNCNAME VARNAME)
+ if(NOT Threads_FOUND)
+ CHECK_LIBRARY_EXISTS(${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")
+ if(CMAKE_C_COMPILER_LOADED)
+ set(_threads_src ${CMAKE_CURRENT_LIST_DIR}/CheckForPthreads.c)
+ elseif(CMAKE_CXX_COMPILER_LOADED)
+ set(_threads_src ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/FindThreads/CheckForPthreads.cxx)
+ configure_file(${CMAKE_CURRENT_LIST_DIR}/CheckForPthreads.c "${_threads_src}" COPYONLY)
+ endif()
+ try_run(THREADS_PTHREAD_ARG THREADS_HAVE_PTHREAD_ARG
+ ${CMAKE_BINARY_DIR}
+ ${_threads_src}
+ CMAKE_FLAGS -DLINK_LIBRARIES:STRING=-pthread
+ COMPILE_OUTPUT_VARIABLE OUTPUT)
+ unset(_threads_src)
+
+ 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_C_COMPILER_LOADED)
+ CHECK_INCLUDE_FILE("pthread.h" CMAKE_HAVE_PTHREAD_H)
+ else()
+ CHECK_INCLUDE_FILE_CXX("pthread.h" CMAKE_HAVE_PTHREAD_H)
+ endif()
if(CMAKE_HAVE_PTHREAD_H)
#
@@ -51,72 +143,25 @@ else()
set(CMAKE_THREAD_LIBS_INIT "")
set(CMAKE_HAVE_THREADS_LIBRARY 1)
set(Threads_FOUND TRUE)
- endif()
-
- if(NOT CMAKE_HAVE_THREADS_LIBRARY)
- # 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(CMAKE_HAVE_THREADS_LIBRARY 1)
- set(Threads_FOUND TRUE)
- 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()
+ 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()
- 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 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()
+ _check_pthreads_flag()
endif()
endif()
@@ -125,13 +170,13 @@ if(CMAKE_THREAD_LIBS_INIT OR CMAKE_HAVE_LIBC_CREATE)
set(Threads_FOUND TRUE)
endif()
-if(CMAKE_SYSTEM MATCHES "Windows")
+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 MATCHES "HP-UX-*")
+ 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:
@@ -149,12 +194,12 @@ if(CMAKE_USE_PTHREADS_INIT)
set(CMAKE_USE_PTHREADS_INIT 1)
endif()
- if(CMAKE_SYSTEM MATCHES "OSF1-V*")
+ if(CMAKE_SYSTEM MATCHES "OSF1-V")
set(CMAKE_USE_PTHREADS_INIT 0)
set(CMAKE_THREAD_LIBS_INIT )
endif()
- if(CMAKE_SYSTEM MATCHES "CYGWIN_NT*")
+ if(CMAKE_SYSTEM MATCHES "CYGWIN_NT")
set(CMAKE_USE_PTHREADS_INIT 1)
set(Threads_FOUND TRUE)
set(CMAKE_THREAD_LIBS_INIT )
@@ -162,5 +207,18 @@ if(CMAKE_USE_PTHREADS_INIT)
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()
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-18 13:55:39 +0000