Merge pull request #7814

0556572 cmake: don't forbid undefined symbols on openbsd (selsta)

CMakeLists.txt

@@ -234,7 +234,9 @@ add_library(l3 OBJECT incorrect_source.cpp)
     file(REMOVE_RECURSE "${TEST_PROJECT}")
   endforeach()
 endfunction()
-forbid_undefined_symbols()
+if (NOT (CMAKE_SYSTEM_NAME MATCHES "kOpenBSD.*|OpenBSD.*"))
+  forbid_undefined_symbols()
+endif()
 
 if (MINGW)
   function(export_all_symbols)