I can't catkin_make

edit

system:vmware15.5pro ubuntu18.04.2 ros melodic

Base path: /home/liu/testpkg
Source space: /home/liu/testpkg/src
Build space: /home/liu/testpkg/build
Devel space: /home/liu/testpkg/devel
Install space: /home/liu/testpkg/install
####
#### Running command: "make cmake_check_build_system" in "/home/liu/testpkg/build"
####
-- Using CATKIN_DEVEL_PREFIX: /home/liu/testpkg/devel
-- Using CMAKE_PREFIX_PATH: /opt/ros/melodic
-- This workspace overlays: /opt/ros/melodic

-- Found PythonInterp: /usr/bin/python2 (found suitable version "2.7.17", minimum required is "2") 
-- Using PYTHON_EXECUTABLE: /usr/bin/python2
-- Using Debian Python package layout
-- Using empy: /usr/bin/empy
-- Using CATKIN_ENABLE_TESTING: ON
-- Call enable_testing()
-- Using CATKIN_TEST_RESULTS_DIR: /home/liu/testpkg/build/test_results
-- Found gtest sources under '/usr/src/googletest': gtests will be built
-- Found gmock sources under '/usr/src/googletest': gmock will be built
-- Found PythonInterp: /usr/bin/python2 (found version "2.7.17") 
-- Using Python nosetests: /usr/bin/nosetests-2.7

-- catkin 0.7.20
-- BUILD_SHARED_LIBS is on
-- BUILD_SHARED_LIBS is on
-- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-- ~~  traversing 1 packages in topological order:
-- ~~  - learning_topic
-- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-- +++ processing catkin package: 'learning_topic'
-- ==> add_subdirectory(learning_topic)
-- Using these message generators: gencpp;geneus;genlisp;gennodejs;genpy
CMake Error at /opt/ros/melodic/share/genmsg/cmake/genmsg-extras.cmake:94 (message):
  add_message_files() directory not found:

  /home/liu/testpkg/src/learning_topic/msg
Call Stack (most recent call first):
  learning_topic/CMakeLists.txt:80 (add_message_files)


-- Configuring incomplete, errors occurred!
See also "/home/liu/testpkg/build/CMakeFiles/CMakeOutput.log".
See also "/home/liu/testpkg/build/CMakeFiles/CMakeError.log".
Makefile:530: recipe for target 'cmake_check_build_system' failed
make: *** [cmake_check_build_system] Error 1
Invoking "make cmake_check_build_system" failed

and i found a solution of commenting out the following lines,which didn't work

## add_message_files
## add_service_files
## generate_messages

what should i do?

here is the error log:

Determining if the pthread_create exist failed with the following output:
Change Dir: /home/liu/testpkg/build/CMakeFiles/CMakeTmp



 Run Build Command:"/usr/bin/make" "cmTC_9f8ac/fast"
    /usr/bin/make -f CMakeFiles/cmTC_9f8ac.dir/build.make CMakeFiles/cmTC_9f8ac.dir/build
    make[1]: 进入目录“/home/liu/testpkg/build/CMakeFiles/CMakeT

mp”
Building C object CMakeFiles/cmTC_9f8ac.dir/CheckSymbolExists.c.o
/usr/bin/cc    -o CMakeFiles/cmTC_9f8ac.dir/CheckSymbolExists.c.o   -c /home/liu/testpkg/build/CMakeFiles/CMakeTmp/CheckSymbolExists.c


 Linking C executable cmTC_9f8ac
    /usr/bin/cmake -E cmake_link_script CMakeFiles/cmTC_9f8ac.dir/link.txt --verbose=1
    /usr/bin/cc      -rdynamic CMakeFiles/cmTC_9f8ac.dir/CheckSymbolExists.c.o  -o cmTC_9f8ac 
    CMakeFiles/cmTC_9f8ac.dir/CheckSymbolExists.c.o：在函数‘main’中：
    CheckSymbolExists.c:(.text+0x1b)：对‘pthread_create’未定义的引用
    collect2: error: ld returned 1 exit status


     CMakeFiles/cmTC_9f8ac.dir/build.make:97: recipe for target 'cmTC_9f8ac' fail

    ed
    make[1]: *** [cmTC_9f8ac] Error 1
    make[1]: 离开目录“/home/liu/testpkg/build/CMakeFiles/CMakeTmp”
    Makefile:126: recipe for target 'cmTC_9f8ac/fast' failed
    make: *** [cmTC_9f8ac/fast] Error 2

    File /home/liu/testpkg/build/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
    }

    Determining if the function pthread_create exists in the pthreads failed with the following output:
    Change Dir: /home/liu/testpkg/build/CMakeFiles/CMakeTmp

    Run Build Command:"/usr ...