dlopen returns error "undefined symbol" but symbol is defined

Issue

Our tool our_tool dynamically loads the library liblib_our_tool.so. It complains concerning the symbol _OURTOOL_XYZv defined in the tool itself.

# echo $LD_LIBRARY_PATH
.:/our_tool/local/shlib
# cd /our_tool/local/bin
# ./loadsim include_so=liblib_process_loadsim_smfServer.so
so=liblib_our_tool.so,dlopen error=/our_tool/local/shlib/liblib_our_tool.so: undefined symbol: _OURTOOL_XYZv