@@ -191,6 +191,16 @@ unsafe extern "C-unwind" {
191191// #[cfg_attr(test, assert_instr(throw, TAG = 0, ptr = core::ptr::null_mut()))]
192192#[ inline]
193193#[ unstable( feature = "wasm_exception_handling_intrinsics" , issue = "122465" ) ]
194+ // FIXME: Since this instruction unwinds, `core` built with `-C panic=unwind`
195+ // cannot be linked with `-C panic=abort` programs. But that's not
196+ // entirely supported anyway, because runtimes without EH support won't
197+ // be able to handle `try` blocks in `-C panic=unwind` crates either.
198+ // We ship `-C panic=abort` `core`, so this doesn't affect users
199+ // directly. Resolving this will likely require patching out both `try`
200+ // and `throw` instructions, at which point we can look into whitelisting
201+ // this function in the compiler to allow linking.
202+ // See https://github.com/rust-lang/rust/issues/118168.
203+ #[ allow( ffi_unwind_calls) ]
194204pub unsafe fn throw < const TAG : i32 > ( ptr : * mut u8 ) -> ! {
195205 static_assert ! ( TAG == 0 ) ; // LLVM only supports tag 0 == C++ right now.
196206 wasm_throw ( TAG , ptr)
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