How do I force cmake to include “-pthread” option during compilation?

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The Threads module in the latest versions (>= 3.1) of CMake generates the Threads::Threads imported target. Linking your target against Threads::Threads adds all the necessary compilation and linking flags. It can be done like this:

set(CMAKE_THREAD_PREFER_PTHREAD TRUE)
set(THREADS_PREFER_PTHREAD_FLAG TRUE)
find_package(Threads REQUIRED)

add_executable(test test.cpp)
target_link_libraries(test Threads::Threads)

Use of the imported target is highly recommended for new code, according to the CMake docs

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