Add -z defs linker option when building shared lib
The -z defs linker option makes the linking of a shared library fail if
there are unresolved symbol references.
BUG=aomedia:3064
Change-Id: Ib96854a80faffff5c76a72388429307ddce72825
diff --git a/CMakeLists.txt b/CMakeLists.txt
index adf2591..df67220 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -721,6 +721,17 @@
endif()
if(BUILD_SHARED_LIBS)
+ if(NOT MSVC AND NOT APPLE)
+ # The -z defs linker option reports unresolved symbol references from object
+ # files when building a shared library.
+ if("${CMAKE_VERSION}" VERSION_LESS "3.13")
+ # target_link_options() is not available before CMake 3.13.
+ target_link_libraries(aom PRIVATE -Wl,-z,defs)
+ else()
+ target_link_options(aom PRIVATE LINKER:-z,defs)
+ endif()
+ endif()
+
include("${AOM_ROOT}/build/cmake/exports.cmake")
setup_exports_target()
endif()
