plugins/spectrum_analyzer: Add cmake option to build it or not

And by default exclude it from build.

Signed-off-by: Dan Nechita <[email protected]>

CMakeLists.txt

@@ -27,6 +27,9 @@ project(iio-oscilloscope
 	LANGUAGES C
 )
 
+############################### Options #######################################
+option(WITH_PLUGIN_SPECTRUM_ANALYZER "Build the Spectrum Analyzer plugin?" OFF)
+
 if (${CMAKE_SYSTEM_NAME} MATCHES "Windows")
 	string(TIMESTAMP BUILD_YEAR "%Y")
 endif()
@@ -302,4 +305,9 @@ foreach(plib_dest xmls filters waveforms block_diagrams)
 	install(DIRECTORY ${plib_dest} DESTINATION ${PLIB_DEST})
 endforeach()
 
+if (WITH_PLUGIN_SPECTRUM_ANALYZER)
+	add_definitions(-DPLUGIN_SPECTRUM_ANALYZER)
+endif()
+
+
 add_subdirectory(plugins)

plugins/spectrum_analyzer.c

@@ -894,11 +894,15 @@ struct osc_plugin plugin;
 
 static bool analyzer_identify(const struct osc_plugin *plugin)
 {
+#ifdef PLUGIN_SPECTRUM_ANALYZER
 	/* Use the OSC's IIO context just to detect the devices */
 	struct iio_context *osc_ctx = get_context_from_osc();
 
 	return !!iio_context_find_device(osc_ctx, PHY_DEVICE) &&
 		!!iio_context_find_device(osc_ctx, CAP_DEVICE);
+#else
+	return false;
+#endif
 }
 
 struct osc_plugin plugin = {