https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78795
--- Comment #6 from Vincent Lefèvre <vincent-gcc at vinc17 dot net> --- Hmm... I can see the changes in the GCC 4.9 release notes. Something not obvious (the last time I had tested LTO was with GCC 4.8). And I would have expected libtool to select the right ar/ranlib/nm tools, but that's a libtool issue.