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Alex Crichton 003cf14969 Build a sysroot that supports C++ exceptions by default (#606) ... This commit collects together some LLVM PRs, some changes in the build configuration here, and some thoughts from #565 and related issues. Specifically the changes here are: * The patch for llvm/llvm-project#168449 is updated to its upstream (unlanded) form. * Patches for the (landed) llvm/llvm-project#185770 and llvm/llvm-project#185775 are added. * The `WASI_SDK_EXCEPTIONS` configuration is now either `ON`, `OFF`, or `DUAL`. The default depends on the version of Clang in use, where 23.0.0+ (which isn't released officially yet) will be `DUAL` and otherwise it's `OFF`. CI for our custom-built patched toolchain defaults to `DUAL`. * In `DUAL` mode libcxx is built twice into two different directories, once with exceptions and once without. This is supported by LLVM patches and means that Clang will select the right set of libraries based on compiler flags. The end result here is that the produced toolchain from this repository, by default, supports C++ exceptions. Additionally if exceptions-related flags are not passed then the final binary will not use C++ exceptions nor require the wasm exception-handling proposal. There's still follow-up work from #565, such as: * Subjectively it feels wordy to pass `-fwasm-exceptions` vs `-fexceptions`. * Personally I think `-mllvm -wasm-use-legacy-eh=false` should become the default upstream. * Subjectively I don't think that `-lunwind` should be necessary and it should be injected automatically with `-fwasm-exceptions` (or `-fexceptions`). * Shared libraries for exceptions remain disabled due to build errors I do not personally know how to resolve. I'll file follow-up issues for these once this has landed since they're more minor compared to the main body of "anything works". Closes #334 Closes #565 --------- Co-authored-by: Joel Dice <joel.dice@akamai.com>		4 weeks ago
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docker	ci: add riscv64-linux build via cross-compilation on ubuntu-24.04 (#621)	4 weeks ago
build.sh	Build a sysroot that supports C++ exceptions by default (#606)	4 weeks ago
docker-build.sh	ci: add riscv64-linux build via cross-compilation on ubuntu-24.04 (#621)	4 weeks ago
merge-artifacts.sh	ci: add riscv64-linux build via cross-compilation on ubuntu-24.04 (#621)	4 weeks ago