CODEWITHSUNDEEP
c++xcodexgboost
user247471
user247471

Reputation: 1

Undefined Symbol when Using XGBoost in C++

I want to include the XGBoost library in my C++ project. Here are the steps which I have followed:

  1. Download from GitHub by using git.
  2. Compile XGBoost files using make -j4
  3. In XCode, I add the XGBoost path into path search: search-paths
  4. In my project, when I used to include, the XGBoost file can be found. However, when I execute my code, here is the error message: enter image description here

It saying that undefined symbol with function name in c_api.h
Does anyone know how to solve this problem? If I want to compile these files in Linux, which command I should include in order to link the XGBoost library. Thank you so much for your help!!

Upvotes: 0

Views: 743

Answers (2)

user10063119
user10063119

Reputation:

Select project in navigator, under build settings,

  • Set "Other linker flags" (OTHER_LDFLAGS) to the equivalent of "-L<path> -<flag>". For example, for {fmt}, it would be -L/usr/local/Cellar/fmt/7.0.1/lib -lfmt

    Find it out using pkg-config --libs <libname>.

  • If the lib file(s) is not under path, set "Library search paths" (LIBRARY_SEARCH_PATHS ) to the parent directory of the library.

https://help.apple.com/xcode/mac/current/#/itcaec37c2a6

Upvotes: 0

yflelion
yflelion

Reputation: 1746

Did you set the DYLD_LIBRARY_PATH?

If you want to compile on linux. Saying you did the following in your home:

git clone --recursive https://github.com/dmlc/xgboost
cd xgboost
mkdir build
cd build
cmake ..
make -j4

you include path is:

-I ~/xgboost/include/xgboost

the library will libxgboost.so will be present in ~/xgboost/lib
In order to link with this library you must add:

-L ~/xgboost/lib -lxgboost

Since It is a shared lib (.so) you have to modify your LD_LIBRARY_PATH and export it.

export LD_LIBRARY_PATH=~/xgboost/lib:$LD_LIBRARY_PATH

ps: an other solution if you don't want to modify your LD_LIBRARY_PATH is to add

-Wl,-rpath=~/xgboost/lib

Upvotes: 1

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