cmake: Fail if undefined symbols are used

Make the linking of the shared library fail when undefined symbols are
used. Linking undefined symbols in a shared library normally works and
the linking of the binary using the shared library fails. We also
compile some example applications and they failed already.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 2de65905a40d8893155877a2b0894bcedec56f39..f4dca0dba358db483fcef82e8fabde4dff587fdd 100644 (file)
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -10,6 +10,7 @@ ENDIF()
 ADD_DEFINITIONS(-Wno-unused-parameter -Wmissing-declarations)
 
 SET(CMAKE_SHARED_LIBRARY_LINK_C_FLAGS "")
+SET(CMAKE_SHARED_LINKER_FLAGS "-Wl,--no-undefined")
 
 IF(MBEDTLS)
   ADD_DEFINITIONS(-DHAVE_MBEDTLS)