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#334Closes#565
Alex Crichton
b2947d1eb7