mainWithoutEnv

fn mainWithoutEnv(c_argc: c_int, c_argv: [*][*:0]c_char) callconv(.c) c_int {
    const argv = @as([*][*:0]u8, @ptrCast(c_argv))[0..@intCast(c_argc)];
    const environ: [:null]?[*:0]u8 = switch (builtin.os.tag) {
        .wasi, .emscripten => environ: {
            const c_environ = std.c.environ;
            var env_count: usize = 0;
            while (c_environ[env_count] != null) : (env_count += 1) {}
            break :environ c_environ[0..env_count :null];
        },
        else => &.{},
    };
    const env_block: std.process.Environ.Block = .{ .slice = environ };
    if (std.Options.debug_threaded_io) |t| {
        if (@sizeOf(std.Io.Threaded.Argv0) != 0) t.argv0.value = argv[0];
        t.environ = .{ .process_environ = .{ .block = env_block } };
        t.environ_initialized = env_block.isEmpty();
    }
    return callMain(argv, env_block);
}