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 <ha...@hauke-m.de>
---
 CMakeLists.txt | 1 +
 1 file changed, 1 insertion(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 2de6590..f4dca0d 100644
--- 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)
-- 
2.39.2


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