CMake在目录中构建，但在使用add_subdirectory时不会

Question

我不知道如何解释原因，但当我在目录中运行cmake时，它工作得很好。如果我上一级并在CMakeLists.txt中使用Add_SubDirectory，那么它就坏了。

我会把台阶放下。

1. mkdir MyFolder
2. git克隆https://github.com/mariadb-corporation/mariadb-connector-c.git

这些步骤证明构建是可行的：

1. cd mariadb-connector-c
2. mkdir内部版本和cd内部版本
3. cmake -G忍者..
4. 忍者

好的，这很有效。因此，下一步尝试上一级：

1. cd ../..(现在位于“MyFolder”中)
2. 添加包含此源的CMakeLists.txt。

cmake_minimum_required(VERSION 3.0.0)
project(mariadb VERSION 1.0.0)

add_subdirectory(mariadb-connector-c)

1. mkdir内部版本和cd内部版本
2. cmake -G忍者..

现在它爆炸了。有人知道为什么会这样吗？

编辑

按照这里的要求，日志作为子项目构建时会出现第一个错误。

Determining if files select.h exist failed with the following output:
Change Dir: /home/questionable/Desktop/Programming/source-mariadb/build/CMakeFiles/CMakeTmp

Run Build Command(s):/usr/bin/ninja cmTC_c650d && [1/2] Building C object CMakeFiles/cmTC_c650d.dir/HAVE_SELECT_H.c.o
FAILED: CMakeFiles/cmTC_c650d.dir/HAVE_SELECT_H.c.o 
/usr/bin/cc   -Wunused -Wlogical-op -Wno-uninitialized -Wall -Wextra -Wformat-security -Wno-init-self -Wwrite-strings -Wshift-count-overflow -Wdeclaration-after-statement -Wno-undef -Wno-unknown-pragmas -o CMakeFiles/cmTC_c650d.dir/HAVE_SELECT_H.c.o   -c /home/questionable/Desktop/Programming/source-mariadb/build/CMakeFiles/CheckIncludeFiles/HAVE_SELECT_H.c
/home/questionable/Desktop/Programming/source-mariadb/build/CMakeFiles/CheckIncludeFiles/HAVE_SELECT_H.c:2:10: fatal error: select.h: No such file or directory
    2 | #include 
      |          ^~~~~~~~~~
compilation terminated.
ninja: build stopped: subcommand failed.


Source:
/* */
#include 


int main(void){return 0;}

Answer 1

我在cmake configure阶段从你的源代码得到的错误是：

CMake Deprecation Warning at mariadb-connector-c/CMakeLists.txt:5 (CMAKE_MINIMUM_REQUIRED):
  Compatibility with CMake < 2.8.12 will be removed from a future version of
  CMake.

  Update the VERSION argument  value or use a ... suffix to tell
  CMake that the project does not need compatibility with older versions.


CMake Warning (dev) at mariadb-connector-c/CMakeLists.txt:19 (PROJECT):
  Policy CMP0048 is not set: project() command manages VERSION variables.
  Run "cmake --help-policy CMP0048" for policy details.  Use the cmake_policy
  command to set the policy and suppress this warning.

  The following variable(s) would be set to empty:

    PROJECT_VERSION
    PROJECT_VERSION_MAJOR
    PROJECT_VERSION_MINOR
    PROJECT_VERSION_PATCH
This warning is for project developers.  Use -Wno-dev to suppress it.

CMake Error at mariadb-connector-c/cmake/install_plugins.cmake:11 (INSTALL):
  INSTALL TARGETS given no LIBRARY DESTINATION for module target "dialog".
Call Stack (most recent call first):
  mariadb-connector-c/cmake/plugins.cmake:82 (INSTALL_PLUGIN)
  mariadb-connector-c/plugins/auth/CMakeLists.txt:30 (REGISTER_PLUGIN)
  mariadb-connector-c/plugins/CMakeLists.txt:7 (INCLUDE)
  mariadb-connector-c/CMakeLists.txt:392 (INCLUDE)


CMake Error at mariadb-connector-c/cmake/install_plugins.cmake:11 (INSTALL):
  INSTALL TARGETS given no LIBRARY DESTINATION for module target
  "client_ed25519".
Call Stack (most recent call first):
  mariadb-connector-c/cmake/plugins.cmake:82 (INSTALL_PLUGIN)
  mariadb-connector-c/plugins/auth/CMakeLists.txt:54 (REGISTER_PLUGIN)
  mariadb-connector-c/plugins/CMakeLists.txt:7 (INCLUDE)
  mariadb-connector-c/CMakeLists.txt:392 (INCLUDE)


CMake Error at mariadb-connector-c/cmake/install_plugins.cmake:11 (INSTALL):
  INSTALL TARGETS given no LIBRARY DESTINATION for module target
  "caching_sha2_password".
Call Stack (most recent call first):
  mariadb-connector-c/cmake/plugins.cmake:82 (INSTALL_PLUGIN)
  mariadb-connector-c/plugins/auth/CMakeLists.txt:70 (REGISTER_PLUGIN)
  mariadb-connector-c/plugins/CMakeLists.txt:7 (INCLUDE)
  mariadb-connector-c/CMakeLists.txt:392 (INCLUDE)


CMake Error at mariadb-connector-c/cmake/install_plugins.cmake:11 (INSTALL):
  INSTALL TARGETS given no LIBRARY DESTINATION for module target
  "sha256_password".
Call Stack (most recent call first):
  mariadb-connector-c/cmake/plugins.cmake:82 (INSTALL_PLUGIN)
  mariadb-connector-c/plugins/auth/CMakeLists.txt:81 (REGISTER_PLUGIN)
  mariadb-connector-c/plugins/CMakeLists.txt:7 (INCLUDE)
  mariadb-connector-c/CMakeLists.txt:392 (INCLUDE)


CMake Error at mariadb-connector-c/cmake/install_plugins.cmake:11 (INSTALL):
  INSTALL TARGETS given no LIBRARY DESTINATION for module target
  "auth_gssapi_client".
Call Stack (most recent call first):
  mariadb-connector-c/cmake/plugins.cmake:82 (INSTALL_PLUGIN)
  mariadb-connector-c/plugins/auth/CMakeLists.txt:106 (REGISTER_PLUGIN)
  mariadb-connector-c/plugins/CMakeLists.txt:7 (INCLUDE)
  mariadb-connector-c/CMakeLists.txt:392 (INCLUDE)


CMake Error at mariadb-connector-c/cmake/install_plugins.cmake:11 (INSTALL):
  INSTALL TARGETS given no LIBRARY DESTINATION for module target
  "mysql_clear_password".
Call Stack (most recent call first):
  mariadb-connector-c/cmake/plugins.cmake:82 (INSTALL_PLUGIN)
  mariadb-connector-c/plugins/auth/CMakeLists.txt:126 (REGISTER_PLUGIN)
  mariadb-connector-c/plugins/CMakeLists.txt:7 (INCLUDE)
  mariadb-connector-c/CMakeLists.txt:392 (INCLUDE)


CMake Error at mariadb-connector-c/cmake/install_plugins.cmake:11 (INSTALL):
  INSTALL TARGETS given no LIBRARY DESTINATION for module target "remote_io".
Call Stack (most recent call first):
  mariadb-connector-c/cmake/plugins.cmake:82 (INSTALL_PLUGIN)
  mariadb-connector-c/plugins/io/CMakeLists.txt:7 (REGISTER_PLUGIN)
  mariadb-connector-c/plugins/CMakeLists.txt:7 (INCLUDE)
  mariadb-connector-c/CMakeLists.txt:392 (INCLUDE)


-- Configuring incomplete, errors occurred!
See also "/home/kamil/tmp/test/build/CMakeFiles/CMakeOutput.log".
See also "/home/kamil/tmp/test/build/CMakeFiles/CMakeError.log".

看起来好像有个问题install.cmake.看起来很奇怪INSTALL_PLUGINDIR未设置，因此DESTINATION参数install没有参数...:/。以下内容：

cmake_minimum_required(VERSION 3.0.0)
project(mariadb VERSION 1.0.0)

set(INSTALL_PLUGINDIR /some/path)
add_subdirectory(mariadb-connector-c)

允许生成项目。