Object library install dir

Code
1

Hey

I want to install an object library but i met a problem with the directory where the object file are installed

install(TARGETS ${PROJECT_TARGET_NAME}
        EXPORT "${PROJECT_TARGET_NAME}Targets"
        DESTINATION ${CMAKE_INSTALL_LIBDIR}/$<CONFIG>
        FILE_SET headers
        DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
        FILE_SET headers_generated_export
        DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
        FILE_SET headers_generated_version
        DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
        OBJECTS
        DESTINATION "obj"
)

I thought my OBJECTS file will be installed on the obj directory but they are installed on
obj/objects-<CONFIG>/${PROJECT_TARGET_NAME}/

Any ideas ?

Thanks in advance and have a good day !

2

After some investigation, this is not possible to change that directory.

Here is the source code

std::string computeInstallObjectDir(cmGeneratorTarget* gt,
                                    std::string const& config)
{
  std::string objectDir = "objects";
  if (!config.empty()) {
    objectDir += "-";
    objectDir += config;
  }
  objectDir += "/";
  objectDir += gt->GetName();
  return objectDir;
}

case cmStateEnums::OBJECT_LIBRARY: {
      // Compute all the object files inside this target
      std::vector<std::string> objects;
      this->Target->GetTargetObjectNames(config, objects);

      files.Type = cmInstallType_FILES;
      files.NoTweak = true;
      files.FromDir = this->Target->GetObjectDirectory(config);
      files.ToDir = computeInstallObjectDir(this->Target, config);
      for (std::string& obj : objects) {
        files.From.emplace_back(obj);
        files.To.emplace_back(std::move(obj));
      }
      return files;
    }

Does anyone know why the path is hard-computed especially for object library ?

3

The OBJECTS DESTINATION option to install(TARGETS) specifies a base directory under which to install object files. Within that the layout is designed to avoid conflicts in cases like same-named sources in different directories.

CMake Issue 25407 requests more granular controls over this behavior.