Compiling CGAL application with emscripten

[Kunza Rizvi]

I am trying to compile a CGAL application on the web using emscripten and web assembly. According to the emscripten documentation, external libraries must be compiled to bitcode first. I am not sure how to achieve that since CGAL has quite a large number of include files. Since I am a beginner in CGAL, I'd appreciate some help and guidance regarding the steps required for CGAL to web compilation.

[Sam Clegg]

You should be able to compile to a library just like you would on a native platform.  i.e. compile each source to an object files and combine them into a library using `emar`,  Then link that library into your final program.

We don't recommend using bitcode (at least not aside from LTO where it's an implementation detail) these days.  Can I ask where you saw the instructions to compile to bitcode?

cheers,

sam

On Tue, Feb 2, 2021 at 1:42 AM Kunza Rizvi <kunza...@gmail.com> wrote:

I am trying to compile a CGAL application on the web using emscripten and web assembly. According to the emscripten documentation, external libraries must be compiled to bitcode first. I am not sure how to achieve that since CGAL has quite a large number of include files. Since I am a beginner in CGAL, I'd appreciate some help and guidance regarding the steps required for CGAL to web compilation.

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[Kunza Rizvi]

I found the conversion to bitcode on a blog post, stackoverflow and the emscripten documentation (though the documentaton did not explicitly state CGAL in particular) 

Here are the corresponding links:

https://stackoverflow.com/questions/31214387/using-emscripten-with-cmake-in-a-simple-project

https://emscripten.org/docs/compiling/Building-Projects.html#using-libraries

https://adamrehn.com/articles/creating-javascript-bindings-for-c-cxx-libraries-with-emscripten/

I looked further into the problem and found that web assembly does not support rounding modes which might break most functions in CGAL. Do you know any work-around for this? I want to use CGAL for basic mesh-related computations in a hole detection and hole filling related project. 

[Alon Zakai]

Thanks, the docs do look a little out of date. I opened https://github.com/emscripten-core/emscripten/pull/13417 for that now.

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