From dd6690b6ca7b2cf735867a55a2e92ef1f0c01639 Mon Sep 17 00:00:00 2001
From: Heikki Hannikainen <hessu@hes.iki.fi>
Date: Mon, 1 Jun 2015 10:29:19 +0300
Subject: [PATCH] hackrf: Add cmake magic to figure out if multiple devices
 support is available in libhackrf, so that backwards compatibility with old
 libhackrf is maintained.

Signed-off-by: Heikki Hannikainen <hessu@hes.iki.fi>
---
 cmake/Modules/FindLibHackRF.cmake | 9 +++++++++
 lib/hackrf/hackrf_sink_c.cc       | 4 +++-
 lib/hackrf/hackrf_source_c.cc     | 4 +++-
 3 files changed, 15 insertions(+), 2 deletions(-)

diff --git a/cmake/Modules/FindLibHackRF.cmake b/cmake/Modules/FindLibHackRF.cmake
index 73e97f3..260d6ba 100644
--- a/cmake/Modules/FindLibHackRF.cmake
+++ b/cmake/Modules/FindLibHackRF.cmake
@@ -22,3 +22,12 @@ FIND_LIBRARY(
 INCLUDE(FindPackageHandleStandardArgs)
 FIND_PACKAGE_HANDLE_STANDARD_ARGS(LIBHACKRF DEFAULT_MSG LIBHACKRF_LIBRARIES LIBHACKRF_INCLUDE_DIRS)
 MARK_AS_ADVANCED(LIBHACKRF_LIBRARIES LIBHACKRF_INCLUDE_DIRS)
+
+INCLUDE(CheckFunctionExists)
+set(CMAKE_REQUIRED_LIBRARIES ${LIBHACKRF_LIBRARIES})
+CHECK_FUNCTION_EXISTS(hackrf_device_list LIBHACKRF_HAVE_DEVICE_LIST)
+
+if(LIBHACKRF_HAVE_DEVICE_LIST)
+    message(STATUS "HackRF multiple device support enabled")
+endif(LIBHACKRF_HAVE_DEVICE_LIST)
+
diff --git a/lib/hackrf/hackrf_sink_c.cc b/lib/hackrf/hackrf_sink_c.cc
index 2c8025b..7aa864d 100644
--- a/lib/hackrf/hackrf_sink_c.cc
+++ b/lib/hackrf/hackrf_sink_c.cc
@@ -193,9 +193,11 @@ hackrf_sink_c::hackrf_sink_c (const std::string &args)
   }
 
   _dev = NULL;
+#ifdef LIBHACKRF_HAVE_DEVICE_LIST
   if ( hackrf_serial )
     ret = hackrf_open_by_serial( hackrf_serial->c_str(), &_dev );
   else
+#endif  
     ret = hackrf_open( &_dev );
   HACKRF_THROW_ON_ERROR(ret, "Failed to open HackRF device")
 
@@ -484,7 +486,7 @@ std::vector<std::string> hackrf_sink_c::get_devices()
     _usage++;
   }
 
-#if 1
+#ifdef LIBHACKRF_HAVE_DEVICE_LIST
   hackrf_device_list_t *list = hackrf_device_list();
   
   for (unsigned int i = 0; i < list->devicecount; i++) {
diff --git a/lib/hackrf/hackrf_source_c.cc b/lib/hackrf/hackrf_source_c.cc
index 64b8f14..13df11e 100644
--- a/lib/hackrf/hackrf_source_c.cc
+++ b/lib/hackrf/hackrf_source_c.cc
@@ -144,6 +144,7 @@ hackrf_source_c::hackrf_source_c (const std::string &args)
 
   _dev = NULL;
   
+#ifdef LIBHACKRF_HAVE_DEVICE_LIST
   if (dict.count("hackrf") && dict["hackrf"].length() > 0) {
     hackrf_serial = dict["hackrf"];
     
@@ -169,6 +170,7 @@ hackrf_source_c::hackrf_source_c (const std::string &args)
         hackrf_device_list_free(list);
     }
   } else
+#endif
     ret = hackrf_open( &_dev );
     
   HACKRF_THROW_ON_ERROR(ret, "Failed to open HackRF device")
@@ -399,7 +401,7 @@ std::vector<std::string> hackrf_source_c::get_devices()
     _usage++;
   }
 
-#if 1
+#if LIBHACKRF_HAVE_DEVICE_LIST
   hackrf_device_list_t *list = hackrf_device_list();
   
   for (unsigned int i = 0; i < list->devicecount; i++) {