Question

我正在使用/ usr和/ lib在PC上交叉编译一个库（ORBSLAM3）来自rpi4（使用rsync之后）。我将它们放在一个名为“ rootf”的文件夹中。先决条件库已经安装过，因此现在位于〜/ rootf / usr和〜/ rootf / lib中。我需要使用〜/ rootf /作为根来编译ORBSLAM3。

问题是我不熟悉cmake，所以我已经挣扎了一段时间。

编译过程是这样的：

在ORBSLAM3的顶层使用Toolchain-rpi.cmake处理CMakeLists.txt。
在CMakeLists.txt中，它通过find_package（需要穿山甲）找到穿山甲

find_package（）实际上是正确的。成功找到

/home/ethan/raspberrypi/rootfs/usr/local/lib/cmake/Pangolin/PangolinTargets.cmake

此CMakeLists.txt中的CMAKE_PREFIX_PATH是正确的，

/home/ethan/raspberrypi/rootfs/usr/local/lib;/home/ethan/raspberrypi/rootfs/usr/lib/arm-linux-gnueabihf

在ubuntu上卸载pangolin之后，我得到了：

CMake Error at /home/ethan/raspberrypi/rootfs/usr/local/lib/cmake/Pangolin/PangolinTargets.cmake:80 (message):
  The imported target "pangolin" references the file

     "/usr/local/lib/libpangolin.so"

  but this file does not exist.  Possible reasons include:

  * The file was deleted, renamed, or moved to another location.

由于Pangolin最初是安装在板上的，因此libpangolin.so上的文件位于/usr/local/lib/libpangolin.so。我猜想当我使用PangolinTargets.cmake时，它正在做同样的事情。

我在PangolinTargets.cmake中输出CMAKE_SYSROOT，CMAKE_PREFIX_PATH，_IMPORT_PREFIX。这就是我的期望。

CMAKE_SYSROOT = /home/ethan/raspberrypi/rootfs 
CMAKE_PREFIX_PATH = ;/home/ethan/raspberrypi/rootfs/usr/local/lib;/home/ethan/raspberrypi/rootfs/usr/lib/arm-linux-gnueabihf 
_IMPORT_PREFIX = /home/ethan/raspberrypi/rootfs/usr/local

即使我将/ home / ethan / raspberrypi / rootfs添加为以下路径的前缀，也没有任何改变。

set_target_properties(pangolin PROPERTIES
  INTERFACE_INCLUDE_DIRECTORIES "/usr/include;/usr/include;/usr/include;/usr/local/include/eigen3;${_IMPORT_PREFIX}/include"
  INTERFACE_LINK_LIBRARIES "rt;pthread;/usr/lib/arm-linux-gnueabihf/libGL.so;/usr/lib/arm-linux-gnueabihf/libGLU.so;
  INTERFACE_SYSTEM_INCLUDE_DIRECTORIES "/usr/include;/usr/include;/usr/include;/usr/local/include/eigen3"
)

这是PangolinTargets.cmake的内容。我不确定哪个部分导致仅搜索/ usr。谢谢大家。

# Generated by CMake

if("${CMAKE_MAJOR_VERSION}.${CMAKE_MINOR_VERSION}" LESS 2.5)
   message(FATAL_ERROR "CMake >= 2.6.0 required")
endif()
cmake_policy(PUSH)
cmake_policy(VERSION 2.6)
#----------------------------------------------------------------
# Generated CMake target import file.
#----------------------------------------------------------------

# Commands may need to know the format version.
set(CMAKE_IMPORT_FILE_VERSION 1)

# Protect against multiple inclusion, which would fail when already imported targets are added once more.
set(_targetsDefined)
set(_targetsNotDefined)
set(_expectedTargets)
foreach(_expectedTarget pangolin)
  list(APPEND _expectedTargets ${_expectedTarget})
  if(NOT TARGET ${_expectedTarget})
    list(APPEND _targetsNotDefined ${_expectedTarget})
  endif()
  if(TARGET ${_expectedTarget})
    list(APPEND _targetsDefined ${_expectedTarget})
  endif()
endforeach()
if("${_targetsDefined}" STREQUAL "${_expectedTargets}")
  unset(_targetsDefined)
  unset(_targetsNotDefined)
  unset(_expectedTargets)
  set(CMAKE_IMPORT_FILE_VERSION)
  cmake_policy(POP)
  return()
endif()
if(NOT "${_targetsDefined}" STREQUAL "")
  message(FATAL_ERROR "Some (but not all) targets in this export set were already defined.\nTargets Defined: ${_targetsDefined}\nTargets not yet defined: ${_targetsNotDefined}\n")
endif()
unset(_targetsDefined)
unset(_targetsNotDefined)
unset(_expectedTargets)


# Compute the installation prefix relative to this file.
get_filename_component(_IMPORT_PREFIX "${CMAKE_CURRENT_LIST_FILE}" PATH)
get_filename_component(_IMPORT_PREFIX "${_IMPORT_PREFIX}" PATH)
get_filename_component(_IMPORT_PREFIX "${_IMPORT_PREFIX}" PATH)
get_filename_component(_IMPORT_PREFIX "${_IMPORT_PREFIX}" PATH)
if(_IMPORT_PREFIX STREQUAL "/")
  set(_IMPORT_PREFIX "")
endif()

# Create imported target pangolin
add_library(pangolin SHARED IMPORTED)

set_target_properties(pangolin PROPERTIES
  INTERFACE_INCLUDE_DIRECTORIES "/usr/include;/usr/include;/usr/include;/usr/local/include/eigen3;${_IMPORT_PREFIX}/include"
  INTERFACE_LINK_LIBRARIES "rt;pthread;/usr/lib/arm-linux-gnueabihf/libGL.so;/usr/lib/arm-linux-gnueabihf/libGLU.so;/usr/lib/arm-linux-gnueabihf/libGLEW.so;/usr/lib/arm-linux-gnueabihf/libEGL.so;/usr/lib/arm-linux-gnueabihf/libSM.so;/usr/lib/arm-linux-gnueabihf/libICE.so;/usr/lib/arm-linux-gnueabihf/libX11.so;/usr/lib/arm-linux-gnueabihf/libXext.so;rt;pthread;/usr/lib/arm-linux-gnueabihf/libdc1394.so;/usr/lib/arm-linux-gnueabihf/libpng.so;/usr/lib/arm-linux-gnueabihf/libz.so;/usr/lib/arm-linux-gnueabihf/libjpeg.so;/usr/lib/arm-linux-gnueabihf/libtiff.so;/usr/lib/arm-linux-gnueabihf/libIlmImf.so"
  INTERFACE_SYSTEM_INCLUDE_DIRECTORIES "/usr/include;/usr/include;/usr/include;/usr/local/include/eigen3"
)

if(CMAKE_VERSION VERSION_LESS 2.8.12)
  message(FATAL_ERROR "This file relies on consumers using CMake 2.8.12 or greater.")
endif()

# Load information for each installed configuration.
get_filename_component(_DIR "${CMAKE_CURRENT_LIST_FILE}" PATH)
file(GLOB CONFIG_FILES "${_DIR}/PangolinTargets-*.cmake")
foreach(f ${CONFIG_FILES})
  include(${f})
endforeach()

# Cleanup temporary variables.
set(_IMPORT_PREFIX)

# Loop over all imported files and verify that they actually exist
foreach(target ${_IMPORT_CHECK_TARGETS} )
  foreach(file ${_IMPORT_CHECK_FILES_FOR_${target}} )
    if(NOT EXISTS "${file}" )
      message(FATAL_ERROR "The imported target \"${target}\" references the file
   \"${file}\"
but this file does not exist.  Possible reasons include:
* The file was deleted, renamed, or moved to another location.
* An install or uninstall procedure did not complete successfully.
* The installation package was faulty and contained
   \"${CMAKE_CURRENT_LIST_FILE}\"
but not all the files it references.
")
    endif()
  endforeach()
  unset(_IMPORT_CHECK_FILES_FOR_${target})
endforeach()
unset(_IMPORT_CHECK_TARGETS)

# This file does not depend on other imported targets which have
# been exported from the same project but in a separate export set.

# Commands beyond this point should not need to know the version.
set(CMAKE_IMPORT_FILE_VERSION)
cmake_policy(POP)

Answer 1

如何显示我们使用find_package（）搜索的文件的路径？

CMAKE_PREFIX_PATH

用分号分隔的目录列表，指定要由find_package（）搜索的安装前缀...

set(CMAKE_PREFIX_PATH /home/users/rootf/usr/local/lib)
# additionalllly I also do a precaution
set(CMAKE_IGNORE_PATH / /bin /include /usr/lib /usr/local/lib)

您还可以使用CMAKE_FIND_USE_*_PATH变量进行操作。

cmake交叉编译树莓派

1 个答案: