misc: don't export symbols from plugins

Type: improvement
Change-Id: I2a176fe2871d2e54b010bffc4f1f7a3616f0c455
Signed-off-by: Damjan Marion <damarion@cisco.com>
diff --git a/src/cmake/plugin.cmake b/src/cmake/plugin.cmake
index 1bcff55..516588c 100644
--- a/src/cmake/plugin.cmake
+++ b/src/cmake/plugin.cmake
@@ -45,6 +45,7 @@
   endforeach()
   add_library(${plugin_name} SHARED ${PLUGIN_SOURCES} ${api_includes})
   set_target_properties(${plugin_name} PROPERTIES NO_SONAME 1)
+  target_compile_options(${plugin_name} PRIVATE "-fvisibility=hidden")
   set(deps "")
   if(PLUGIN_API_FILES)
     list(APPEND deps ${plugin_name}_api_headers)