wasi-sdk's sysroot build hands its compiler-rt sub-build
CMAKE_C_COMPILER_TARGET but nothing for the ASM language, so the two
wasm/*.S stubs in the builtins (the setjmp/longjmp and C++ exception
tags) were assembled for x86-64. wasm-ld warned on every wasm link that
the archive members were neither Wasm objects nor bitcode, and anything
that reaches those tags, which crafter-build's -wasm-enable-sjlj does,
would fail to link. wasi-sdk's own toolchain never sees it because its
clang defaults to wasm32-wasip1; the sysroot-only mode against a host
clang does. A one-line patch adds CMAKE_ASM_COMPILER_TARGET to that
sub-build; it belongs upstream.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
