Support building wasm backend using emscripten
Currently, our wasm backend only works if the target toolchain is wasi-sdk
. Using emscripten
as the target toolchain requires some extra patches, and it'll fail at link-time with certain unresolved symbol warnings, likely caused by some incoherent feature macros across the tree (e.g. asserting that certain functionality like POSIX signal doesn't exist on wasm32_HOST_ARCH
, but also using HAVE_SIGNAL_H
, when emscripten
sysroot does provide it).
The main reason for adding emscripten
support is for better sanitizer support. According to https://emscripten.org/docs/debugging/Sanitizers.html, emscripten
supports UBSAN and ASAN, both may be useful when debugging the wasm backend.