Added checking for Volk presence according to @dholm #4 pull request.

CMakeLists.txt

@@ -89,6 +89,7 @@ set(GRC_BLOCKS_DIR      ${GR_PKG_DATA_DIR}/grc/blocks)
 # Find gnuradio build dependencies
 ########################################################################
 find_package(GnuradioRuntime)
+find_package(Volk)
 find_package(CppUnit)
 find_package(Doxygen)
 
@@ -103,6 +104,9 @@ find_package(Doxygen)
 if(NOT GNURADIO_RUNTIME_FOUND)
     message(FATAL_ERROR "GnuRadio Runtime required to compile gsm")
 endif()
+if(NOT VOLK_FOUND)
+    message(FATAL_ERROR "Volk library required to compile gsm")
+endif()
 if(NOT CPPUNIT_FOUND)
     message(FATAL_ERROR "CppUnit required to compile gsm")
 endif()

cmake/Modules/FindVolk.cmake

@@ -0,0 +1,26 @@
+INCLUDE(FindPkgConfig)
+PKG_CHECK_MODULES(PC_VOLK volk)
+
+FIND_PATH(
+    VOLK_INCLUDE_DIRS
+    NAMES volk/volk.h
+    HINTS $ENV{VOLK_DIR}/include
+        ${PC_VOLK_INCLUDEDIR}
+    PATHS /usr/local/include
+          /usr/include
+)
+
+FIND_LIBRARY(
+    VOLK_LIBRARIES
+    NAMES volk
+    HINTS $ENV{VOLK_DIR}/lib
+        ${PC_VOLK_LIBDIR}
+    PATHS /usr/local/lib
+          /usr/local/lib64
+          /usr/lib
+          /usr/lib64
+)
+
+INCLUDE(FindPackageHandleStandardArgs)
+FIND_PACKAGE_HANDLE_STANDARD_ARGS(VOLK DEFAULT_MSG VOLK_LIBRARIES VOLK_INCLUDE_DIRS)
+MARK_AS_ADVANCED(VOLK_LIBRARIES VOLK_INCLUDE_DIRS)

lib/CMakeLists.txt

@@ -42,7 +42,7 @@ list(APPEND gsm_sources
 )
 
 add_library(gnuradio-gsm SHARED ${gsm_sources})
-target_link_libraries(gnuradio-gsm ${Boost_LIBRARIES} ${GNURADIO_RUNTIME_LIBRARIES}  
+target_link_libraries(gnuradio-gsm ${Boost_LIBRARIES} ${GNURADIO_RUNTIME_LIBRARIES} ${VOLK_LIBRARIES}
     boost_iostreams
     boost_system
     boost_filesystem