CMake：设置（CMAKE_CXX_STANDARD_REQUIRED True）导致配置错误[重复]

Question

CMake Error at CMakeLists.txt:12 (target_include_directories):
  Cannot specify include directories for target "myproject" which is
  not built by this project.


-- Configuring incomplete, errors occurred!
See also "/home/user/project-path/build/CMakeFiles/CMakeOutput.log".
See also "/home/user/project-path/build/CMakeFiles/CMakeError.log".

这个错误似乎是由CMakeLists.txt 中的这一行引起的。删除此行“修复”了问题。

完全披露：我真的不知道这条线是做什么的，或者是否需要。

set(CMAKE_CXX_STANDARD_REQUIRED True)

这是我CMakeLists.txt的全部内容：

cmake_minimum_required(VERSION 3.7)

project(myproject VERSION 1.0)

set(CMAKE_CXX_STANDARD 17)
set(CMAKE_CXX_STANDARD_REQUIRED True)
set(CMAKE_BUILD_TYPE DEBUG)

set(CMAKE_MODULE_PATH /home/user/project-path)

configure_file(version.hpp.in version.hpp)
target_include_directories(myproject PUBLIC "${PROJECT_BINARY_DIR}")

find_package(SDL2 REQUIRED)
find_package(SDL2TTF REQUIRED)
include_directories(myproject ${SDL2_INCLUDE_DIRS} ${SDL2TTF_INCLUDE_DIR})

set(SOURCE_FILES main.cpp)

add_executable(myproject ${SOURCE_FILES})

target_link_libraries(myproject ${SDL2_LIBRARIES} ${SDL2TTF_LIBRARY} fontconfig)

这是来自文件CMakeError.log的一些相关内容

Run Build Command(s):/usr/bin/gmake cmTC_3abe6/fast && /usr/bin/gmake  -f CMakeFiles/cmTC_3abe6.dir/build.make CMakeFiles/cmTC_3abe6.dir/build
gmake[1]: Entering directory '/home/.../build/CMakeFiles/CMakeTmp'
Building C object CMakeFiles/cmTC_3abe6.dir/src.c.o
/usr/bin/cc   -DCMAKE_HAVE_LIBC_PTHREAD -o CMakeFiles/cmTC_3abe6.dir/src.c.o -c /home/.../build/CMakeFiles/CMakeTmp/src.c
Linking C executable cmTC_3abe6
/usr/bin/cmake -E cmake_link_script CMakeFiles/cmTC_3abe6.dir/link.txt --verbose=1
/usr/bin/cc  -DCMAKE_HAVE_LIBC_PTHREAD CMakeFiles/cmTC_3abe6.dir/src.c.o -o cmTC_3abe6 
/usr/bin/ld: CMakeFiles/cmTC_3abe6.dir/src.c.o: in function `main':
src.c:(.text+0x2f): undefined reference to `pthread_create'
/usr/bin/ld: src.c:(.text+0x3b): undefined reference to `pthread_detach'
/usr/bin/ld: src.c:(.text+0x47): undefined reference to `pthread_cancel'
/usr/bin/ld: src.c:(.text+0x58): undefined reference to `pthread_join'
collect2: error: ld returned 1 exit status
gmake[1]: *** [CMakeFiles/cmTC_3abe6.dir/build.make:106: cmTC_3abe6] Error 1
gmake[1]: Leaving directory '/home/.../build/CMakeFiles/CMakeTmp'
gmake: *** [Makefile:140: cmTC_3abe6/fast] Error 2


Source file was:
#include <pthread.h>

void* test_func(void* data)
{
  return data;
}

int main(void)
{
  pthread_t thread;
  pthread_create(&thread, NULL, test_func, NULL);
  pthread_detach(thread);
  pthread_cancel(thread);
  pthread_join(thread, NULL);
  pthread_atfork(NULL, NULL, NULL);
  pthread_exit(NULL);

  return 0;
}

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

Run Build Command(s):/usr/bin/gmake cmTC_f3bc6/fast && /usr/bin/gmake  -f CMakeFiles/cmTC_f3bc6.dir/build.make CMakeFiles/cmTC_f3bc6.dir/build
gmake[1]: Entering directory '/home/.../build/CMakeFiles/CMakeTmp'
Building C object CMakeFiles/cmTC_f3bc6.dir/CheckFunctionExists.c.o
/usr/bin/cc   -DCHECK_FUNCTION_EXISTS=pthread_create -o CMakeFiles/cmTC_f3bc6.dir/CheckFunctionExists.c.o -c /usr/share/cmake-3.18/Modules/CheckFunctionExists.c
Linking C executable cmTC_f3bc6
/usr/bin/cmake -E cmake_link_script CMakeFiles/cmTC_f3bc6.dir/link.txt --verbose=1
/usr/bin/cc  -DCHECK_FUNCTION_EXISTS=pthread_create CMakeFiles/cmTC_f3bc6.dir/CheckFunctionExists.c.o -o cmTC_f3bc6  -lpthreads 
/usr/bin/ld: cannot find -lpthreads
collect2: error: ld returned 1 exit status
gmake[1]: *** [CMakeFiles/cmTC_f3bc6.dir/build.make:106: cmTC_f3bc6] Error 1
gmake[1]: Leaving directory '/home/.../build/CMakeFiles/CMakeTmp'
gmake: *** [Makefile:140: cmTC_f3bc6/fast] Error 2

我知道这段代码是为了测试这个系统是否支持posix线程，它们应该（？）是......

是什么导致了这个问题？

Answer 1

我被这个错误吓跑了。我认为出于某种原因，Debian 10 上缺少 pthreads。事实并非如此。

这解决了问题：

cmake_minimum_required(VERSION 3.7)

project(textgraphicslib VERSION 1.0)

set(CMAKE_CXX_STANDARD 14)
set(CMAKE_CXX_STANDARD_REQUIRED True)
set(CMAKE_BUILD_TYPE DEBUG)

set(CMAKE_MODULE_PATH /home/ecb/Worlds-Best-Text-Editor-3/Text-Graphics-Lib)

find_package(SDL2 REQUIRED)
find_package(SDL2TTF REQUIRED)
include_directories(textgraphicslib ${SDL2_INCLUDE_DIRS} ${SDL2TTF_INCLUDE_DIR})

set(SOURCE_FILES main.cpp fc_helper.cpp sdlfontmanager.cpp sdlfontmanager_fontmanagerinitsuccess.cpp sdlfonttexturemanager.cpp fc_helper.cpp)

add_executable(textgraphicslib ${SOURCE_FILES})

configure_file(version.hpp.in version.hpp)
target_include_directories(textgraphicslib PUBLIC "${PROJECT_BINARY_DIR}")

target_link_libraries(textgraphicslib ${SDL2_LIBRARIES} ${SDL2TTF_LIBRARY} fontconfig)

请注意，configure_file 行已移至 add_executable 之后。我想那里有一个我不知道的订单依赖关系。另请参阅我之前的问题。