Avoid stdlib printing to stdout/stderr?

A very minimal code sample like this:

#include <memory>

int main() {
  auto a = std::shared_ptr<int>(new int(3));
  return *a + 40;
}

compiled with WASI SDK like this:

clang++ --target=wasm32-wasi -O3 -flto -Wl,--lto-O3 -fno-exceptions --sysroot=/path/to/wasi-sysroot -o test.wasm ./test.cpp

results in a Wasm module that expects wasi_snapshot_preview1::{fd_close, fd_seek, fd_write} as imports, which feels unexpected to me. I am not sure why these imports are there, because I can’t find any embedded debugging strings, but I am assuming it’s because failed allocations etc will print to stderr? Is there any way to disable that and just fail with unreachable instead?

Reproduce the minimal C++ example with the shown WASI SDK and inspect the resulting imports. Trace which standard-library or wasi-libc components introduce fd_close, fd_seek, and fd_write. Done means determining whether those imports can be removed or disabled, and documenting the supported configuration or limitation; no source file or test is named in the issue.