w2c2: DWARF doesn't work

I tried with a minimal file:

#include <stdio.h>

int a() {
	return 42;
}

int b() {
	return a();
}

int c() {
	return b();
}

int main() {
	printf("%d\n", c());
}

built with WASI SDK with debug info and regenerated via w2c2 with debug info:

$ /opt/wasi-sdk/bin/clang mini.cpp -o mini.wasm -g
$ ~/w2c2/w2c2/build/w2c2 -g mini.wasm mini.c

I checked that mini.wasm has DWARF info as expected via llvm-dwarfdump, but the resulting mini.c doesn’t have any #line directives that w2c2 -h says would be emitted.

Regular names are still emitted via __asm__, but the 2nd problem is that one of them looks corrupted (?):

...
U32 wasi_snapshot_preview1__fd_write(struct miniInstance*,U32,U32,U32,U32);

void wasi_snapshot_preview1__proc_exit(struct miniInstance*,U32);

void f5(miniInstance*) __asm__("mini_�{��mU");

void f6(miniInstance*) __asm__("mini___imported_wasi_snapshot_preview1_fd_fdstat_get");

U32 f7(miniInstance*) __asm__("mini___imported_wasi_snapshot_preview1_fd_seek");

U32 f8(miniInstance*) __asm__("mini___imported_wasi_snapshot_preview1_fd_write");
...