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CMake: Ensure we use "-pthread" instead of "-lpthread" for thread support #14540

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Dec 7, 2022
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CMake: Ensure we use "-pthread" instead of "-lpthread" for thread support #14540

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19 changes: 18 additions & 1 deletion cmake/configure/configure_00_threads.cmake
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Original file line number Diff line number Diff line change
Expand Up @@ -21,12 +21,29 @@
# Clear the test flags because FindThreads.cmake will use a C compiler:
clear_cmake_required()

find_package(Threads)
#
# Ensure that we use "-pthread" instead of "-lpthread". We require
# "-pthread" for certain versions of gcc (and standard library thread
# support). Otherwise the order of libraries might be wrong on the final
# link interface and we end up with linker errors such as the following:
# /usr/bin/ld: [...]/step-69.cc.o: undefined reference to symbol 'pthread_create@@GLIBC_2.2.5'
# /usr/bin/ld: /usr/lib/x86_64-linux-gnu/libpthread.so: error adding symbols: DSO missing from command line
#
set(THREADS_PREFER_PTHREAD_FLAG true)

find_package(Threads)
reset_cmake_required()

add_flags(DEAL_II_LINKER_FLAGS "${CMAKE_THREAD_LIBS_INIT}")

#
# Make sure that we compile with "-pthread" as well. The "-pthread"
# compiler flag might add certain preprocessor definitions when compiling.
#
if("${CMAKE_THREAD_LIBS_INIT}" MATCHES "-pthread")
add_flags(DEAL_II_CXX_FLAGS "${CMAKE_THREAD_LIBS_INIT}")
endif()

if(NOT Threads_FOUND)
message(FATAL_ERROR
"\nFatal configuration error: CMake was unable to detect any threading "
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