CMake FIND_PACKAGE成功但返回错误的路径

Question

我正在尝试使用我的CMakeLists.txt中的以下代码将CMake 2.8.6链接到boost :: program_options

FIND_PACKAGE(Boost COMPONENTS program_options REQUIRED)
INCLUDE_DIRECTORIES (${Boost_INCLUDE_DIR})

ADD_EXECUTABLE (segment segment.cpp)
TARGET_LINK_LIBRARIES (segment ${Boost_LIBRARIES})

find命令似乎成功但将错误的目录传递给链接器.该包实际上是:

`/usr/lib64/libboost_program_options-mt.so.5`

但CMakeFiles/segment.dir/link.txt列出以下内容:

/cm/shared/apps/gcc/4.4.6/bin/c++       CMakeFiles/segment.dir/segment.cpp.o  -o segment -rdynamic /usr/lib64/lib64/libboost_program_options-mt.so.5 -lpthread -lrt -Wl,-rpath,/usr/lib64/lib64

注意lib64路径中的额外内容.此外,路径前面的-l标志似乎缺失.

运行CMake时,它报告它正确找到包,并且该{$Boost_LIBRARIES}变量似乎列出了正确的库:

Boost  found.
Found Boost components:
   program_options
${Boost_LIBRARIES} - optimized;boost_program_options-mt-shared;debug;boost_program_options-mt-shared-debug

生成的CMakeCache.txt文件以:

//The directory containing a CMake configuration file for Boost.
Boost_DIR:PATH=/usr/lib64/boost

//Boost include directory
Boost_INCLUDE_DIR:FILEPATH=/usr/include

这似乎是正确的.但是当运行make时它使用上面link.txt中的路径,我得到错误:

make[2]: *** No rule to make target `/usr/lib64/lib64/libboost_program_options-mt.so.5', needed by `segment'.  Stop.
make[1]: *** [CMakeFiles/segment.dir/all] Error 2
make: *** [all] Error 2

什么可能导致这个额外注入一个子目录进入路径？什么可能导致以这种方式生成link.txt？我该如何修复它(或解决它)？

Answer 1

使用某些较旧版本的boost cmake-2.8.6-rc2或更高版本时,会发生此问题,其中boost程序包查找代码已更改.

可以通过-DBoost_NO_BOOST_CMAKE=ON在cmake命令行上指定来解决该问题.

引入此问题的实际提交是7da796d1fdd7cca07df733d010cd343f6f8787a9,可在此处查看.

Answer 2

问题出在boost-devel分布式文件中:/usr/lib64/boost/Boost-relwithdebinfo.cmake

cmake-2.6软件包根本不使用此文件,因为FindBoost.cmake文件返回(正确)完整路径来增强库.cmake28-2.8.8 FindBoost.cmake文件返回类似"boost_date_time-mt-shared"的库字符串,这些字符串是/usr/lib64/boost/Boost-relwithdebinfo.cmake中定义的目标.

在/usr/lib64/boost/Boost-relwithdebinfo.cmake的最顶部,一个名为_IMPORT_PREFIX的变量是从cmake文件本身的位置定义的,然后像这样使用:

#----------------------------------------------------------------
# Generated CMake target import file for configuration "RelWithDebInfo".
#----------------------------------------------------------------

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

# 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)

# Import target "boost_date_time-static" for configuration "RelWithDebInfo"
SET_PROPERTY(TARGET boost_date_time-static APPEND PROPERTY IMPORTED_CONFIGURATIONS RELWITHDEBINFO)
SET_TARGET_PROPERTIES(boost_date_time-static PROPERTIES
  IMPORTED_LOCATION_RELWITHDEBINFO "${_IMPORT_PREFIX}/lib64/libboost_date_time.a"
  )

这将_IMPORT_PREFIX设置为"/ usr/lib64",它与另一个在其中包含/ lib64 /的字符串连接.我发现如果我只是将文件更改为包含第三个GET_FILENAME_COMPONENT调用,它就可以正常工作.像这样:

#----------------------------------------------------------------
# Generated CMake target import file for configuration "RelWithDebInfo".
#----------------------------------------------------------------

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

# 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)

# Import target "boost_date_time-static" for configuration "RelWithDebInfo"
SET_PROPERTY(TARGET boost_date_time-static APPEND PROPERTY IMPORTED_CONFIGURATIONS RELWITHDEBINFO)
SET_TARGET_PROPERTIES(boost_date_time-static PROPERTIES
  IMPORTED_LOCATION_RELWITHDEBINFO "${_IMPORT_PREFIX}/lib64/libboost_date_time.a"
  )