From a422ae2211177f1865ec4e6a19405344ccb03c7e Mon Sep 17 00:00:00 2001
From: Romuald Conty <romuald@libnfc.org>
Date: Mon, 18 Mar 2013 23:32:07 +0100
Subject: [PATCH] CMake: only compile usbbus.c when (at least) one USB driver
 is enabled

---
 cmake/modules/LibnfcDrivers.cmake | 1 +
 libnfc/CMakeLists.txt             | 6 +++---
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/cmake/modules/LibnfcDrivers.cmake b/cmake/modules/LibnfcDrivers.cmake
index 8611844..bbb9af3 100644
--- a/cmake/modules/LibnfcDrivers.cmake
+++ b/cmake/modules/LibnfcDrivers.cmake
@@ -14,6 +14,7 @@ IF(LIBNFC_DRIVER_PN53X_USB)
   FIND_PACKAGE(LIBUSB REQUIRED)
   ADD_DEFINITIONS("-DDRIVER_PN53X_USB_ENABLED")
   SET(DRIVERS_SOURCES ${DRIVERS_SOURCES} "drivers/pn53x_usb")
+  SET(USB_REQUIRED TRUE)
 ENDIF(LIBNFC_DRIVER_PN53X_USB)
 
 IF(LIBNFC_DRIVER_ARYGON)
diff --git a/libnfc/CMakeLists.txt b/libnfc/CMakeLists.txt
index 920e15e..db267e0 100644
--- a/libnfc/CMakeLists.txt
+++ b/libnfc/CMakeLists.txt
@@ -12,9 +12,9 @@ SET(CHIPS_SOURCES chips/pn53x)
 INCLUDE_DIRECTORIES(${CMAKE_CURRENT_SOURCE_DIR}/chips)
 
 # Library's buses
-IF(LIBUSB_FOUND)
-  SET(BUSES_SOURCES buses/usbbus)
-ENDIF(LIBUSB_FOUND)
+IF(USB_REQUIRED)
+  LIST(APPEND BUSES_SOURCES buses/usbbus)
+ENDIF(USB_REQUIRED)
 
 IF(UART_REQUIRED)
   LIST(APPEND BUSES_SOURCES buses/uart)