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Ltrace upstream uses libunwind-ptrace.a to support unwinding. This version of ltrace is not in Fedora yet, but should get there eventually. I can drop the unwind support for the time being, but it would be great if it were available long-term. I know Fedora generally frowns upon shipping .a's, but this functionality is not available in any DSO to my knowledge.
/usr/include/libunwind-ptrace.h /* Helper routines which make it easy to use libunwind via ptrace(). They're available only if UNW_REMOTE_ONLY is _not_ defined and they aren't really part of the libunwind API. They are implemented in a archive library called libunwind-ptrace.a. */ ltrace: checking libunwind.h usability... yes checking libunwind.h presence... yes checking for libunwind.h... yes checking libunwind-ptrace.h usability... yes checking libunwind-ptrace.h presence... yes checking for libunwind-ptrace.h... yes checking whether to use libunwind support... yes checking for backtrace in -lunwind... yes checking for _UPT_create in -lunwind-ptrace... yes checking for _Ux86_64_init_remote in -lunwind-x86_64... yes + checking for _Ux86_init_remote in -lunwind-x86... yes