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FindThreads: Try pthreads with no special option first (#11333) 

QNX has the phtread stuff in the standard library.  The best way would
IMHO be to check if a program that uses pthread_* can be successfully
linked without specifying any linker option before trying out the
different flags.
This commit is contained in:
Rolf Eike Beer 2011-04-25 11:33:15 -04:00 committed by David Cole
parent 7dcbb66315
commit fd61be7140
1 changed files with 29 additions and 20 deletions
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49
Modules/FindThreads.cmake
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@ -23,6 +23,7 @@
INCLUDE (CheckIncludeFiles)
INCLUDE (CheckLibraryExists)
INCLUDE (CheckSymbolExists)
SET(Threads_FOUND FALSE)
# Do we have sproc?
@ -44,33 +45,41 @@ ELSE()
#
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")
# 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)
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")
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()
ENDIF(CMAKE_SYSTEM MATCHES "SunOS.*")
# 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()
ENDIF(CMAKE_SYSTEM MATCHES "SunOS.*")
ENDIF(NOT CMAKE_HAVE_THREADS_LIBRARY)
ENDIF(NOT THREADS_HAVE_PTHREAD_ARG)
IF(NOT CMAKE_HAVE_THREADS_LIBRARY)
@ -111,7 +120,7 @@ ELSE()
ENDIF(CMAKE_HAVE_PTHREAD_H)
ENDIF()
IF(CMAKE_THREAD_LIBS_INIT)
IF(CMAKE_THREAD_LIBS_INIT OR CMAKE_HAVE_LIBC_CREATE)
SET(CMAKE_USE_PTHREADS_INIT 1)
SET(Threads_FOUND TRUE)
ENDIF()