在CMake中链接外部HDFql库 [英] Linking external HDFql library in CMake

问题描述

我已经下载了 HDFql 库，并将全部内容放在了Linux的/ usr / local /中系统。现在，我希望在ROS应用程序中使用此库，因此我尝试将其链接到我的CMakeList中，如下所示：

I have downloaded the HDFql library and put the whole lot in /usr/local/ in my linux system. I now wish to use this library in a ROS application, so I have tried to link it in my CMakeList, which looks as following:

cmake_minimum_required(VERSION 3.2)
project(data_generator)

add_compile_options(-std=c++11)
set(CMAKE_BUILD_TYPE Release) # Release, RelWithDebInfo
set(CMAKE_CXX_FLAGS "-std=c++11 -pthread ${CMAKE_CXX_FLAGS}")

find_package(catkin_simple REQUIRED)
catkin_simple(ALL_DEPS_REQUIRED)

find_package(OpenCV REQUIRED)
include_directories(${OpenCV_INCLUDE_DIRS})

set(HDFQL_ROOT "/usr/local/hdfql-2.1.0")

include_directories(${HDFQL_ROOT}/include)
find_library(HDFQL_LIB HDFql)

if (HDFQL_LIB)
  message("Library(HDFQL_LIB) found in ${HDFQL_LIB}")
else()
  message(FATAL_ERROR "Library (HDFQL_LIB) not found")
endif()

cs_add_executable(
        ${PROJECT_NAME}
        src/main.cpp
        src/data_create.cpp
        src/event_definitions.cpp
)

target_include_directories(${PROJECT_NAME}
    PUBLIC "${HDFQL_ROOT}/include"
)

target_link_libraries(${PROJECT_NAME}
   ${OpenCV_LIBRARIES}
   ${HDFQL_LIB}
)

# CMake Indexing
FILE(GLOB_RECURSE LibFiles "include/*")
add_custom_target(headers SOURCES ${LibFiles})

cs_install()
cs_export()

当我构建它时，它可以正常工作并输出以下消息：

When I build this, it works fine and outputs the message:

Library(HDFQL_LIB) found in /usr/local/hdfql-2.1.0/lib/libHDFql.so

在我的main.cpp文件中包含以下内容：

with the following in my main.cpp file:

#include <HDFql.hpp>
....
std::cout <<"HDFql version: " << HDFql::Version << std::endl;

输出为： HDFql版本：2.1.0 。

但是，一旦我尝试实际使用库的功能-例如：

However, as soon as I try to actually use functions of the library - for example:

#include <HDFql.hpp>
....
std::cout <<"HDFql version: " << HDFql::Version << std::endl;
HDFql::execute("CREATE FILE /home/user/test.h5");

我收到错误：
main.cpp :(。 text + 0x1858）：未定义对`HDFql :: execute（char const *）'的引用

这对我来说虽然CMake没有包含的问题，它在链接实际库（即包括libHDFql.a / libHDFql.so文件）时遇到麻烦。有人可以告诉我我在这里做错什么吗？

This suggests to me that while CMake has no issue with the includes, it is having trouble linking the actual library (ie including the libHDFql.a/libHDFql.so files). Can anyone tell me what I'm doing wrong here?

非常感谢！

推荐答案

问题是我需要包含库 /usr/local/hdfql-2.1.0/wrapper/cpp/libHDFql.so 使用 /usr/local/hdfql-2.1.0/lib/libHDFql.so 。这非常令人发疯，因为参考手册没有对此进行提及，我花了太长时间才弄清楚这一点。哦，我希望这对其他人有帮助。

The problem was that I needed to include the library /usr/local/hdfql-2.1.0/wrapper/cpp/libHDFql.so, where I was using /usr/local/hdfql-2.1.0/lib/libHDFql.so. It's pretty maddening, since the reference manual doesn't make any mention of this and I spent way too long figuring this out. Ohwell, I hope this helps anyone else with this problem.

作为参考，下面是一个最小的柔cat风格的CMakeList，可以使用：

For reference, here is a minimal catkin-style CMakeLists that will work:

cmake_minimum_required(VERSION 3.2)
project(project_name)

add_compile_options(-std=c++11)

find_package(catkin_simple REQUIRED)
catkin_simple(ALL_DEPS_REQUIRED)

set(HDFQL_ROOT "path/to/hdfql-2.1.0")

include_directories(${HDFQL_ROOT}/include)

set(CMAKE_BUILD_TYPE Release)
set(CMAKE_CXX_FLAGS "-std=c++11 -pthread ${CMAKE_CXX_FLAGS}")

cs_add_executable(
    ${PROJECT_NAME}
    # your source file 1
    # your source file 2 
    # ...
)

target_include_directories(${PROJECT_NAME}
    PUBLIC "${HDFQL_ROOT}/include"
)

target_link_libraries(
   ${PROJECT_NAME}
   ${OpenCV_LIBRARIES}
)

target_link_libraries(
   ${PROJECT_NAME}
   "${HDFQL_ROOT}/wrapper/cpp/libHDFql.so"
)

当然，绝对路径不是很漂亮，替代方法是将 /usr/local/hdfql-2.1.0/lib 添加到环境变量 CMAKE_PREFIX_PATH （例如 export CMAKE_PREFIX_PATH = / usr / local / hdfql-2.1.0 / lib：$ CMAKE_PREFIX_PATH ）。

Of course the absolute paths aren't very pretty, the alternative is to add /usr/local/hdfql-2.1.0/lib to the environment variable CMAKE_PREFIX_PATH (eg export CMAKE_PREFIX_PATH="/usr/local/hdfql-2.1.0/lib:$CMAKE_PREFIX_PATH").

这篇关于在CMake中链接外部HDFql库的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！