How can use extenrnal absl library

[linuxpham]

Hi admin,

How can I use an external absl library when compiling your source code?
Because you always force use internal `absl' in third_party folder (_USE_INTERNAL_STRING_VIEW)

error: undefined reference to 'sentencepiece::SentencePieceProcessor::Load(std::basic_string_view<char, std::char_traits<char> >)' collect2: error: ld returned 1 exit status

Thanks !

[taku910]

At this moment, we don't support to external abls, but it is nice to support it.

[linuxpham]

Do you have a plan to support it?

[taku910]

It depends on how many people use it. Could you elaborate the background?

[taku910]

The step is a little complicated, but now we support to build sentencepiece with external abseil.
We have to put the abseil package under third_party sub directory.

> git clone https://github.com/google/sentencepiece.git  
> cd sentencepiece/third_party/
> git clone https://github.com/abseil/abseil-cpp.git 
> rm -fr absl
> ln -s abseil-cpp/absl absl
> cd ..
> mkdir build
> cd build
> cmake .. -DSPM_USE_EXTERNAL_ABSL=ON -DSPM_ENABLE_SHARED=OFF
> make