In Linux ldd has very useful option LD_DEBUG.
LD_DEBUG (glibc since 2.1) Output verbose debugging information about the dynamic linker. If set to all prints all debugging information it has, if set to help prints a help message about which categories can be specified in this environment variable. Since glibc 2.3.4, LD_DEBUG is ignored for set-user-ID/set-group-ID binaries.
Can i do it on FreeBSD?