cmake 返回“未定義的 pthread_create 引用”錯誤

Question

我正在嘗試構建 webrtc 項目： https://github.com/mpromonet/webrtc-streamer?fbclid=IwAR2HBwWIZvRhSlmKBllQj2knaBPn6oeEvS24STPLTZHb

當我運行cmake. 我收到以下錯誤：

WEBRTCBUILD = Release
WEBRTCROOT = /home/mohamed/Desktop/upwork/SoftwareExperts/test3/webrtc-streamer/../webrtc
WEBRTCDESKTOPCAPTURE= ON
CMAKE_CXX_COMPILER_ID=GNU
ALSA_FOUND = FALSE
CMake Error: The following variables are used in this project, but they are set to NOTFOUND.
Please set them or make sure they are set and tested correctly in the CMake files:
WEBRTC_LIBRARY
    linked by target "webrtc-streamer" in directory /home/mohamed/Desktop/upwork/SoftwareExperts/test3/webrtc-streamer

-- Configuring incomplete, errors occurred!
See also "/home/mohamed/Desktop/upwork/SoftwareExperts/test3/webrtc-streamer/CMakeFiles/CMakeOutput.log".
See also "/home/mohamed/Desktop/upwork/SoftwareExperts/test3/webrtc-streamer/CMakeFiles/CMakeError.log".

此后“CMakeError.log”的內容

Determining if the pthread_create exist failed with the following output:
Change Dir: /home/mohamed/Desktop/upwork/SoftwareExperts/test3/webrtc-streamer/CMakeFiles/CMakeTmp

Run Build Command:"/usr/bin/make" "cmTC_13271/fast"
/usr/bin/make -f CMakeFiles/cmTC_13271.dir/build.make CMakeFiles/cmTC_13271.dir/build
make[1]: Entering directory '/home/mohamed/Desktop/upwork/SoftwareExperts/test3/webrtc-streamer/CMakeFiles/CMakeTmp'
Building C object CMakeFiles/cmTC_13271.dir/CheckSymbolExists.c.o
/usr/bin/cc    -fPIE   -o CMakeFiles/cmTC_13271.dir/CheckSymbolExists.c.o   -c /home/mohamed/Desktop/upwork/SoftwareExperts/test3/webrtc-streamer/CMakeFiles/CMakeTmp/CheckSymbolExists.c
Linking C executable cmTC_13271
/usr/bin/cmake -E cmake_link_script CMakeFiles/cmTC_13271.dir/link.txt --verbose=1
/usr/bin/cc       CMakeFiles/cmTC_13271.dir/CheckSymbolExists.c.o  -o cmTC_13271 -rdynamic 
CMakeFiles/cmTC_13271.dir/CheckSymbolExists.c.o: In function `main':
CheckSymbolExists.c:(.text+0x1b): undefined reference to `pthread_create'
collect2: error: ld returned 1 exit status
CMakeFiles/cmTC_13271.dir/build.make:97: recipe for target 'cmTC_13271' failed
make[1]: *** [cmTC_13271] Error 1
make[1]: Leaving directory '/home/mohamed/Desktop/upwork/SoftwareExperts/test3/webrtc-streamer/CMakeFiles/CMakeTmp'
Makefile:126: recipe for target 'cmTC_13271/fast' failed
make: *** [cmTC_13271/fast] Error 2

   
File /home/mohamed/Desktop/upwork/SoftwareExperts/test3/webrtc-streamer/CMakeFiles/CMakeTmp/CheckSymbolExists.c:
/* */
#include <pthread.h>

int main(int argc, char** argv)
{
  (void)argv;
#ifndef pthread_create
  return ((int*)(&pthread_create))[argc];
#else
  (void)argc;
  return 0;
#endif
}

在 CMakeLists.txt 之后： https://github.com/mpromonet/webrtc-streamer/blob/master/CMakeLists.txt

pthread 庫安裝在我的 ubuntu PC 上，因為使用 -lpthread 編譯測試文件“test.c”沒有問題

我錯過了什么？

Answer 1

您需要將“pthread”添加到 CMakeLists.txt 中的“target_link_libraries”部分。

[編輯]

正如@arrowd 所建議的，正確的方法是使用“FindThreads”： https://cmake.org/cmake/help/latest/module/FindThreads.html