On , 2020Apr22, at 14:54, Wolfgang Bangerth
<[email protected]<mailto:[email protected]>> wrote:
FIND_PACKAGE(Threads) calls a cmake-builtin module that on my system lives in
/usr/share/cmake/Modules/FindThreads.cmake. It contains this piece of code:
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.
# We list some pthread functions in PTHREAD_C_CXX_TEST_SOURCE test code.
# If the pthread functions already exist in C library, we could just use
# them instead of linking to the additional pthread library.
if(CMAKE_C_COMPILER_LOADED)
CHECK_C_SOURCE_COMPILES("${PTHREAD_C_CXX_TEST_SOURCE}"
CMAKE_HAVE_LIBC_PTHREAD)
elseif(CMAKE_CXX_COMPILER_LOADED)
CHECK_CXX_SOURCE_COMPILES("${PTHREAD_C_CXX_TEST_SOURCE}"
CMAKE_HAVE_LIBC_PTHREAD)
endif()
if(CMAKE_HAVE_LIBC_PTHREAD)
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 ()
if(CMAKE_SYSTEM MATCHES "GHS-MULTI")
_check_threads_lib(posix pthread_create CMAKE_HAVE_PTHREADS_CREATE)
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()
What's your version of cmake?
3.16
V.
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