CMake 找不到 PythonLibs

Question

我正在尝试在运行在 VirtualBox 模拟器中的 ubuntu 上构建inria Graphite，我按照说明安装了python-dev软件包，但是当我运行 cmake 时，仍然出现错误：

CMake Error at /usr/share/cmake-2.8/Modules/FindPackageHandleStandardArgs.cmake:108          (message):
Could NOT find PythonLibs (missing: PYTHON_LIBRARIES PYTHON_INCLUDE_DIRS)
(Required is at least version "3.2")
Call Stack (most recent call first):
 /usr/share/cmake-2.8/Modules/FindPackageHandleStandardArgs.cmake:315     (_FPHSA_FAILURE_MESSAGE)
 /usr/share/cmake-2.8/Modules/FindPythonLibs.cmake:208 (FIND_PACKAGE_HANDLE_STANDARD_ARGS)
 src/packages/OGF/gel_python3/CMakeLists.txt:11 (FIND_PACKAGE)

我检查/usr/lib/并发现

tintin@tintin-VirtualBox:/usr/lib$ find . -name "libpython*"
./x86_64-linux-gnu/libpython3.4m.so.1.0
./x86_64-linux-gnu/libpython2.7.so.1.0
./x86_64-linux-gnu/libpython3.4m.a
./x86_64-linux-gnu/libpython2.7.a
./x86_64-linux-gnu/libpython3.4m.so
./x86_64-linux-gnu/libpython2.7.so
./x86_64-linux-gnu/libpython2.7.so.1
./x86_64-linux-gnu/libpython3.4m.so.1

那么为什么 cmake 找不到 PythonLibs，或者我应该如何处理呢？

Answer 1

安装python-dev实际上为我解决了这个问题：

sudo apt-get install python-dev

在这里得到提示：https : //github.com/Valloric/YouCompleteMe/issues/484

Answer 2

问题似乎是 Ubuntu 14.04 默认安装 Python 3.4，而来自 Ubuntu (2.8) 的 CMake 版本只搜索 Python 3.3。解决方法是set(Python_ADDITIONAL_VERSIONS 3.4)在find_package语句之前添加。请注意，我提交了有关此问题的错误。

从 CMake 3.0 开始，CMake 搜索到 Python 3.4，因此手动安装该版本也应该可以解决问题。

Answer 3

对我来说，问题是缓存不好

rm CMakeCache.txt

删除了旧 2.7 版本的缓存，并允许它在我的情况下找到 3.2。

我使用的 cmake 是

find_package(PythonInterp 3.2 REQUIRED)
find_package(PythonLibs 3.2 REQUIRED)
message(STATUS "PYTHON_LIBRARIES = ${PYTHON_LIBRARIES}")
message(STATUS "PYTHON_EXECUTABLE = ${PYTHON_EXECUTABLE}")
message(STATUS "PYTHON_INCLUDE_DIRS = ${PYTHON_INCLUDE_DIRS}")
...
include_directories(${PYTHON_INCLUDE_DIRS})

Answer 4

我最近在 Ubuntu 14.04 64 位上遇到了类似的问题；显然，CMake 默认情况下不会查看依赖于体系结构的安装文件夹：

CMake constructs a set of possible installation prefixes for the package. Under
each prefix several directories are searched for a configuration file. The tables
below show the directories searched.

[...]

  <prefix>/(lib/<arch>|lib|share)/cmake/<name>*/          (U)
  <prefix>/(lib/<arch>|lib|share)/<name>*/                (U)
  <prefix>/(lib/<arch>|lib|share)/<name>*/(cmake|CMake)/  (U)

[...]

In all cases the <name> is treated as case-insensitive and corresponds to any of
the names specified (<package> or names given by NAMES). Paths with lib/<arch>
are enabled if CMAKE_LIBRARY_ARCHITECTURE is set.

（来自find_package 命令的 CMake 2.8.12 在线文档）

解决方案包括在为 PythonLibs 调用 find_package 之前在项目根 CMakeLists.txt 文件中设置此 CMAKE_LIBRARY_ARCHITECTURE （在您的情况下将编辑 src/packages/OGF/gel_python3/CMakeLists.txt ）；例如：

cmake_minimum_required(VERSION 2.8)
project(project_name)

# Check the architecture and set CMAKE_LIBRARY_ARCHITECTURE accordingly
if(UNIX)
  if(CMAKE_SIZEOF_VOID_P EQUAL 8)
    set(CMAKE_LIBRARY_ARCHITECTURE "x86_64-linux-gnu")
  endif()
endif()

find_package(PythonInterp 3.2 REQUIRED)
find_package(PythonLibs 3.2 REQUIRED)

# Rest of your file

这对我来说有效。