[clang] [lld] [llvm] [WebAssembly] WASIP3 and component model threading support (PR #175800)

[Alex Crichton via cfe-commits]

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@@ -120,6 +121,8 @@ void WebAssemblyTargetInfo::getTargetDefines(const LangOptions &Opts,
     Builder.defineMacro("__wasm_tail_call__");
   if (HasWideArithmetic)
     Builder.defineMacro("__wasm_wide_arithmetic__");
+  if (HasComponentModelThreadContext)
+    Builder.defineMacro("__wasm_component_model_thread_context__");
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alexcrichton wrote:

I think this'll be useful to have in wasi-libc, yeah, to enable conditional builds of wasm32-wasip3 with/without this feature.

https://github.com/llvm/llvm-project/pull/175800