如果我直接在命令行上用 g++ 编译,我可以看到我需要的一切都在那里:
$ g++ -pthread test.cpp
$ ldd a.out
linux-vdso.so.1 => (0x00007fffd05b3000)
libstdc++.so.6 => /usr/lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007f4a1ba8d000)
libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007f4a1b870000)
...more...
然后我尝试为这个 5 行测试应用程序创建一个简单的 cmake 文件:
$ cat CMakeLists.txt
PROJECT ( Test CXX )
CMAKE_MINIMUM_REQUIRED ( VERSION 2.8 )
FIND_PACKAGE ( Threads REQUIRED )
ADD_EXECUTABLE ( test test.cpp )
TARGET_LINK_LIBRARIES ( test ${CMAKE_THREAD_LIBS_INIT} )
但是,我无法弄清楚为什么 CMake 找不到它需要使用的内容Threads
:
$ cd build/
$ cmake ..
CMake Error at /usr/share/cmake-2.8/Modules/FindPackageHandleStandardArgs.cmake:97 (MESSAGE):
Could NOT find Threads (missing: Threads_FOUND)
Call Stack (most recent call first):
/usr/share/cmake-2.8/Modules/FindPackageHandleStandardArgs.cmake:288 (_FPHSA_FAILURE_MESSAGE)
/usr/share/cmake-2.8/Modules/FindThreads.cmake:166 (FIND_PACKAGE_HANDLE_STANDARD_ARGS)
CMakeLists.txt:4 (FIND_PACKAGE)
-- Configuring incomplete, errors occurred!