object file is not write on the mounted directory.

[liudonghua123]

Hi, I tried to use clang wasm to compile the c source code.

I can use cli command: wasmer run clang --mapdir /sysroot:./sysroot32 --mapdir /lib:./lib-small --dir . -- -cc1 -triple wasm32-unknown-wasi -emit-obj -mrelax-all -disable-free -clear-ast-before-backend -disable-llvm-verifier -discard-value-names -main-file-name hello.c -mrelocation-model static -mframe-pointer=none -ffp-contract=on -fno-rounding-math -ffp-exception-behavior=ignore -mconstructor-aliases -target-feature +atomics -target-feature +bulk-memory -target-feature +mutable-globals -target-feature +sign-ext -target-cpu generic -target-feature +atomics -target-feature +bulk-memory -target-feature +mutable-globals -fvisibility=hidden -mllvm -treat-scalable-fixed-error-as-warning -debugger-tuning=gdb -v -fcoverage-compilation-dir=/home -resource-dir /lib/clang/16 -D _WASI_EMULATED_MMAN -D _WASI_EMULATED_SIGNAL -D _WASI_EMULATED_PROCESS_CLOCKS -D USE_TIMEGM -isysroot /sysroot -internal-isystem /lib/clang/16/include -internal-isystem /sysroot/include/wasm32-wasi -internal-isystem /sysroot/include -fdebug-compilation-dir=/home -ferror-limit 19 -ftls-model=local-exec -pthread -fgnuc-version=4.2.1 -o test.o -x c test.c to generate the object file, but if I use @wasmer/sdk, the command executed ok with exitCode 0, stdout "", stderr "". But inspect the object file. it's not exists.

The related js code:

        // 2. Run Clang
        // clang ... -o test.o -x c test.c
        term.write("Running clang...\r\n");
        const clangPkg = await Wasmer.fromFile(pkg.clang);
        const clangInstance = await clangPkg.entrypoint.run({
            args: [
                "-cc1", "-triple", "wasm32-unknown-wasi", "-emit-obj", "-disable-free",
                "-isysroot", "/sysroot",
                "-internal-isystem", "/lib/clang/16/include",
                "-internal-isystem", "/sysroot/include/wasm32-wasi",
                "-internal-isystem", "/sysroot/include",
                "-ferror-limit", "19", 
                "-o", "/test.o", "-x", "c", "/test.c"
            ],
            mount: {
                "/": rootDir,
                "/sysroot": sysrootDir,
                "/lib": libDir
            },
            cwd: '/',
        });
        
        const clangResult = await clangInstance.wait();
        if (clangResult.stdout) term.write(clangResult.stdout);
        if (clangResult.stderr) term.write(clangResult.stderr);
        
        if (clangResult.code !== 0) {
             throw new Error(`clang failed with code ${clangResult.code}`);
        }
        term.write("clang done.\r\n");
        try {
            const objFile = await rootDir.readFile("/test.o");
            console.log("Found test.o, size:", objFile.length);
        } catch (e) {
            console.error("test.o still not found in rootDir");
        }
        const res1 = await rootDir.readDir("/");
        console.info(res1)