[ncp] allow a vendor defined subclass of ncp_uart or ncp_spi to access ncp_base members (#2412)

src/ncp/ncp_base.hpp

@@ -167,7 +167,7 @@ public:
      */
     bool ShouldDeferHostSend(void);
 
-private:
+protected:
     typedef otError (NcpBase::*PropertyHandler)(void);
 
     struct PropertyHandlerEntry
@@ -674,7 +674,6 @@ protected:
     SpinelDecoder mDecoder;
     bool mHostPowerStateInProgress;
 
-private:
     enum
     {
         kTxBufferSize = OPENTHREAD_CONFIG_NCP_TX_BUFFER_SIZE,  // Tx Buffer size (used by mTxFrameBuffer).

src/ncp/ncp_spi.cpp

@@ -53,6 +53,8 @@
 namespace ot {
 namespace Ncp {
 
+#if OPENTHREAD_ENABLE_SPINEL_VENDOR_SUPPORT == 0
+
 static otDEFINE_ALIGNED_VAR(sNcpRaw, sizeof(NcpSpi), uint64_t);
 
 extern "C" void otNcpInit(otInstance *aInstance)
@@ -68,6 +70,8 @@ extern "C" void otNcpInit(otInstance *aInstance)
     }
 }
 
+#endif // OPENTHREAD_ENABLE_SPINEL_VENDOR_SUPPORT == 0
+
 static void spi_header_set_flag_byte(uint8_t *header, uint8_t value)
 {
     header[0] = value;

src/ncp/ncp_uart.cpp

@@ -51,6 +51,8 @@
 namespace ot {
 namespace Ncp {
 
+#if OPENTHREAD_ENABLE_SPINEL_VENDOR_SUPPORT == 0
+
 static otDEFINE_ALIGNED_VAR(sNcpRaw, sizeof(NcpUart), uint64_t);
 
 extern "C" void otNcpInit(otInstance *aInstance)
@@ -66,6 +68,8 @@ extern "C" void otNcpInit(otInstance *aInstance)
     }
 }
 
+#endif // OPENTHREAD_ENABLE_SPINEL_VENDOR_SUPPORT == 0
+
 NcpUart::UartTxBuffer::UartTxBuffer(void)
     : Hdlc::Encoder::BufferWriteIterator()
 {