Question

我想使用Point Cloud Library编译一个简单的项目。不幸的是，它使用的是旧版本的boost库，因为我目前已通过官方存储库安装。

所以我在/opt/oldlibs/boost/libs中安装了较旧的库。我尝试在CMakeLists.txt中设置这个新路径，但不知何故cmake仍然使用/usr/lib中安装的当前版本。我在CMakeLists.txt文件中做错了什么？

cmake_minimum_required(VERSION 2.8 FATAL_ERROR)
cmake_policy(SET CMP0053 OLD)

project(cloud_viewer)

find_package(PCL 1.2 REQUIRED)

include_directories(${PCL_INCLUDE_DIRS})
link_directories(${PCL_LIBRARY_DIRS})
add_definitions(${PCL_DEFINITIONS})

# Add old boost library
link_directories("/usr/oldlibs/libs")
set(Boost_NO_SYSTEM_PATHS TRUE)
if (Boost_NO_SYSTEM_PATHS)
  set(BOOST_ROOT "/opt/oldlibs/boost")
  set(BOOST_INCLUDE_DIRS "/usr/include/boost")
  set(BOOST_LIBRARY_DIRS "${BOOST_ROOT}/libs")
endif (Boost_NO_SYSTEM_PATHS)
find_package(Boost REQUIRED regex date_time system filesystem thread graph program_options serialization iostreams chrono atomic)
include_directories(${BOOST_INCLUDE_DIRS})

add_executable (cloud_viewer cloud_viewer.cpp)
target_link_libraries (cloud_viewer ${PCL_LIBRARIES})

cmake的（部分）输出是：

-- Boost version: 1.64.0
-- Found the following Boost libraries:
--   regex
--   date_time
--   system
--   filesystem
--   thread
--   graph
--   program_options
--   serialization
--   iostreams
--   chrono
--   atomic

但我需要1.63。我做错了什么？我使用arch linux，我目前的cmake版本是3.8.2。

修改

我更新了CMakeLists.txt：

cmake_minimum_required(VERSION 2.8 FATAL_ERROR)
cmake_policy(SET CMP0053 OLD)

project(cloud_viewer)

find_package(PCL 1.2 REQUIRED)

include_directories(${PCL_INCLUDE_DIRS})
link_directories(${PCL_LIBRARY_DIRS})
add_definitions(${PCL_DEFINITIONS})

# Add old boost library
set(BOOST_VERSION_REQUIRED "1.63.0")

set(Boost_NO_SYSTEM_PATHS TRUE)
if (Boost_NO_SYSTEM_PATHS)
  set(BOOST_ROOT "/opt/oldlibs/boost")
  set(BOOST_INCLUDE_DIRS "${BOOST_ROOT}/include")
  set(BOOST_LIBRARY_DIRS "${BOOST_ROOT}/lib")
endif (Boost_NO_SYSTEM_PATHS)

include_directories(${BOOST_INCLUDE_DIRS})
find_package(Boost ${BOOST_VERSION_REQUIRED} EXACT REQUIRED regex date_time system filesystem thread graph program_options serialization iostreams chrono atomic)

add_executable (cloud_viewer cloud_viewer.cpp)
target_link_libraries (cloud_viewer ${PCL_LIBRARIES})

Cmake现在明白我想使用旧版本，但仍无法找到它。我有其他错误吗？我通过从/var/cache/pacman/pkg/' and extracted it to / opt / oldlibs / boost /`中提取by packman缓存版本来安装旧包。

usr目录如下所示：

usr
├── oldlib
│   ├── boost
│   │   ├── bin
│   │   ├── include (contains all header files)
│   │   ├── lib (contains all libraries, static and shared)
│   │   └── share

这是cmake输出的一部分：

CMake Error at /usr/share/cmake-3.8/Modules/FindBoost.cmake:1842 (message):
  Unable to find the requested Boost libraries.

  Boost version: 1.64.0

  Boost include path: /usr/include

  Detected version of Boost is too new.  Requested version was 1.63.
Call Stack (most recent call first):
  CMakeLists.txt:23 (find_package)

我还尝试使用选项cmake运行-DCMAKE_PREFIX_PATH=/opt/oldlibs/boost/lib并改变路径。它没有改变任何东西。

Answer 1

您的find_package()似乎有误，因为您没有在其上指定版本要求：

find_package(Boost REQUIRED regex date_time system filesystem thread graph program_options serialization iostreams chrono atomic)

这要求cmake提升Boost，理解“任何提升都很好”。您知道这个假设不成立，因此您应该指定所需的版本：

set(BOOST_VERSION_REQUIRED "your version value here") # adjust as needed
find_package(Boost ${BOOST_VERSION_REQUIRED} REQUIRED regex date_time system filesystem thread graph program_options serialization iostreams chrono atomic)

如果仍然不起作用（因为cmake的版本控制惯例导致它更喜欢较新的Boost，假设更新更好...），那么你可以指定EXACT到迫使版本。

set(BOOST_VERSION_REQUIRED "your version value here") # adjust as needed
find_package(Boost ${BOOST_VERSION_REQUIRED} EXACT REQUIRED regex date_time system filesystem thread graph program_options serialization iostreams chrono atomic)

全是documented here。

强制cmake使用较旧的boost库

修改

1 个答案: