uart_ow: Make onewire functionality optional but on by default

Signed-off-by: Brendan Le Foll <brendan.le.foll@intel.com>

src/CMakeLists.txt

@@ -9,6 +9,11 @@ if (FIRMATA)
   add_subdirectory (firmata)
 endif ()
 
+if (ONEWIRE)
+  set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -DONEWIRE=1")
+  add_subdirectory (uart_ow)
+endif ()
+
 include_directories(
   ${mraa_LIB_INCLUDE_DIRS}
 )
@@ -23,7 +28,6 @@ set (mraa_LIB_SRCS_NOAUTO
   ${PROJECT_SOURCE_DIR}/src/uart/uart.c
   ${PROJECT_SOURCE_DIR}/src/iio/iio.c
   ${mraa_LIB_SRCS_NOAUTO}
-  ${PROJECT_SOURCE_DIR}/src/uart_ow/uart_ow.c
 )
 
 set (mraa_LIB_X86_SRCS_NOAUTO

src/javascript/binding.gyp.cmake

@@ -29,6 +29,7 @@
       'defines' : [ 'SWIG',
                     'SWIGJAVASCRIPT',
                     'FIRMATA=ON',
+                    'ONEWIRE=ON',
                     'BUILDING_NODE_EXTENSION=1',
                     'SWIG_V8_VERSION=0x0<(v8_version)',
                     'V8_VERSION=0x0<(v8_version)'

src/uart_ow/CMakeLists.txt

@@ -0,0 +1,7 @@
+if (ONEWIRE)
+  message (STATUS "INFO - Adding onewire backend support")
+  set (mraa_LIB_SRCS_NOAUTO ${mraa_LIB_SRCS_NOAUTO}
+    ${PROJECT_SOURCE_DIR}/src/uart_ow/uart_ow.c
+    PARENT_SCOPE
+  )
+endif ()