minor changes to build libhermit without PCI support

src/drivers/mod.rs

@@ -16,17 +16,22 @@
 //#[cfg(not(feature = "newlib"))]
 pub mod net;
 
+#[cfg(feature = "pci")]
 pub mod virtio;
 
+#[cfg(feature = "pci")]
 use crate::drivers::error::DriverError;
+#[cfg(feature = "pci")]
 pub type Result<T> = core::result::Result<T, DriverError>;
 
 /// A common error module for drivers.
 /// [DriverError](enums.drivererror.html) values will be
 /// passed on to higher layers.
+#[cfg(feature = "pci")]
 pub mod error {
 	use crate::drivers::virtio::error::VirtioError;
 	use core::fmt;
+
 	#[derive(Debug)]
 	pub enum DriverError {
 		InitVirtioDevFail(VirtioError),

src/drivers/net/mod.rs

@@ -5,6 +5,8 @@
 // http://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or
 // http://opensource.org/licenses/MIT>, at your option. This file may not be
 // copied, modified, or distributed except according to those terms.
+
+#[cfg(feature = "pci")]
 pub mod virtio_net;
 
 use crate::arch::kernel::percore::*;

src/syscalls/interfaces/mod.rs

@@ -166,6 +166,7 @@ pub trait SyscallInterface: Send + Sync {
 	}
 
 	fn receive_rx_buffer(&self) -> Result<(&'static [u8], usize), ()> {
+		#[cfg(feature = "pci")]
 		match arch::kernel::pci::get_network_driver() {
 			Some(driver) => driver.lock().receive_rx_buffer(),
 			_ => Err(()),
@@ -175,6 +176,7 @@ pub trait SyscallInterface: Send + Sync {
 	}
 
 	fn rx_buffer_consumed(&self, handle: usize) -> Result<(), ()> {
+		#[cfg(feature = "pci")]
 		match arch::kernel::pci::get_network_driver() {
 			Some(driver) => {
 				driver.lock().rx_buffer_consumed(handle);