Unable to Build WASM Locally on macOS

[DeanBDean]

Hello, I am currently unable to build the wasm library locally on macOS 14.5. Here are the steps I have tried

Run

./scripts/build_wasm_docker.sh

And

# install emscripten via instructions from BUILDING.md
emcmake cmake -B build-web-debug . -D CMAKE_BUILD_TYPE=Debug
cmake --build build-web-debug --config Debug

And

emcmake cmake -B build-web .
cmake --build build-web

All of these give the same error message

[  0%] Building CXX object external/astc-encoder/Source/CMakeFiles/astcenc-none-static.dir/astcenc_averages_and_directions.cpp.o
clang++: error: overriding '-ffp-model=precise' option with '-ffp-contract=off' [-Werror,-Woverriding-option]
make[2]: *** [external/astc-encoder/Source/CMakeFiles/astcenc-none-static.dir/astcenc_averages_and_directions.cpp.o] Error 1
make[1]: *** [external/astc-encoder/Source/CMakeFiles/astcenc-none-static.dir/all] Error 2
make: *** [all] Error 2

I have been able to do the build on Ubuntu in WSL. I also confirmed this same error on a coworker's Macbook with the same OS version. Please let me know if I can provide any more information

[MarkCallow]

This was fixed by PR #933 5 days ago. You need to pull the latest main. It is clang 20-related. The Emscripten docker image was updated to that version recently. Presumably you do not have the latest Emscripten Docker image installed on your WSL Ubuntu system.

[DeanBDean]

Ah, thank you so much, sorry for the bad report. I can confirm I hadn't pulled in that latest commit. When I did that, it just worked. Just FYI, on the WSL side, I actually installed emscripten manually and didn't use the Docker image.

[MarkCallow]

Thank you for the update. Glad it's working again.

Emscripten is actually based on clang. It was updated to a clang 20 recently. Most likely you haven't updated your WSL Ubuntu to the latest Emscripten SDK. The Docker image was updated though. Sorry for my misleading description earlier.