如何在使用 cmake 编译时正确获取 -pthread 标志？

Question

已经有关于如何使用 cmake 做线程的问题的答案，但是没有一个例子，我试过的也不起作用。

所以，我将 cmake 项目与目录和测试，并修改了 CMakeLists.txt 用于测试.

我改变了这个：

# Testing library
FetchContent_Declare(
  catch
  GIT_REPOSITORY https://github.com/catchorg/Catch2.git
  GIT_TAG v2.13.6)
FetchContent_MakeAvailable(catch)
# Adds Catch2::Catch2

# Tests need to be added as executables first
add_executable(testlib testlib.cpp)

# I'm using C++17 in the test
target_compile_features(testlib PRIVATE cxx_std_17)

# Should be linked to the main library, as well as the Catch2 testing library
target_link_libraries(testlib PRIVATE modern_library Catch2::Catch2)

# If you register a test, then ctest and make test will run it.
# You can also run examples and check the output, as well.
add_test(NAME testlibtest COMMAND testlib) # Command can be a target

进入这个：

# Testing library
FetchContent_Declare(
  catch
  GIT_REPOSITORY https://github.com/catchorg/Catch2.git
  GIT_TAG v2.13.6)
FetchContent_MakeAvailable(catch)
# Adds Catch2::Catch2

set(THREADS_PREFER_PTHREAD_FLAG ON)
find_package(Threads)


# Tests need to be added as executables first
add_executable(testlib testlib.cpp)

# I'm using C++17 in the test
target_compile_features(testlib PRIVATE cxx_std_17)

# Should be linked to the main library, as well as the Catch2 testing library
target_link_libraries(testlib PRIVATE modern_library Catch2::Catch2 Threads::Threads)

# If you register a test, then ctest and make test will run it.
# You can also run examples and check the output, as well.
add_test(NAME testlibtest COMMAND testlib) # Command can be a target

然后我用 mkdir 构建 cmake -B。 -S..

当我用

make VERBOSE

编译时，我看到

-pthread

标志没有添加到编译和链接中。

那么，如何修改用于测试的 CMakeList.txt 以获得

-pthread

编译和链接标志？