Enable support for multiple kernels for xeus-cpp-lite

[anutosh491]

Description

Fixes #185

Type of change

Please tick all options which are relevant.

• Bug fix
• New feature
• Added/removed dependencies
• Required documentation updates

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 60.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 81.78%. Comparing base (66510a4) to head (2e28107).

Files with missing lines	Patch %	Lines
src/xinterpreter.cpp	60.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #290      +/-   ##
==========================================
- Coverage   82.00%   81.78%   -0.22%     
==========================================
  Files          20       20              
  Lines         950      950              
  Branches       87       87              
==========================================
- Hits          779      777       -2     
- Misses        171      173       +2     

Files with missing lines	Coverage Δ
src/xinterpreter.cpp	90.10% <60.00%> (-1.10%)	⬇️

Files with missing lines	Coverage Δ
src/xinterpreter.cpp	90.10% <60.00%> (-1.10%)	⬇️

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[github-actions]

clang-tidy review says "All clean, LGTM! 👍"

[anutosh491]

Screen.Recording.2025-04-17.at.1.47.31.PM.mp4

Demo above : Shows 3 xeus-cpp-lite kernels built (all use different flags -std=c++17/20/23)

On top of which xcpp20 is built using the -msimd128 flag (required for running simd code in the browser)

  "argv": [
      "@XEUS_CPP_KERNELSPEC_PATH@xcpp",
      "-resource-dir", "@XEUS_CPP_RESOURCE_DIR@",
      "-std=c++20", "-msimd128"
  ],
  
// instead of 

  "argv": [
      "@XEUS_CPP_KERNELSPEC_PATH@xcpp",
      "-resource-dir", "@XEUS_CPP_RESOURCE_DIR@",
      "-std=c++23", 
  ],

So xcpp20 kernel would work but xcpp23 wouldn't !

[github-actions]

clang-tidy made some suggestions

[github-actions]

clang-tidy made some suggestions

[anutosh491]

clang-format is a bit too much (probably can be ignored here ?)

[anutosh491]

Hey @JohanMabille @martinRenou

As y'all helped me with the design here on the JupyterLite, could y'all review the changes here for me ?

1. After this we should see 3 kernels through our deployment link
2. We are preloading the path to clang's resource-dir (/lib/clang/20 where 20 is latest llvm version) into the file system. This provides the header wasm_simd128.h for xsimd to run in the browser.
3. As a ToDo
   After the next cppinterop release, we would also be able to address this Fix exception handling (throw) in xeus-cpp-lite. #222

So currently xeus-cpp-lite doesn't have exception handling due to missing emscripten flags.
But we should soon be able to make this change

{
  "display_name": "C++20",
  "argv": [
      "@XEUS_CPP_KERNELSPEC_PATH@xcpp",
      "-resource-dir", "@XEUS_CPP_RESOURCE_DIR@",
-      "-std=c++20"
+      "-std=c++20", "-mllvm", "-enable-emscripten-cxx-exceptions"
  ],
  

And support this as I tried building on main

[martinRenou]

Really cool to finally get multiple kernel specs support in JupyterLite!

[github-actions]

clang-tidy made some suggestions

[github-actions]

clang-tidy made some suggestions