https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79033
Martin Sebor <msebor at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |ASSIGNED Last reconfirmed| |2017-01-09 CC| |msebor at gcc dot gnu.org Assignee|unassigned at gcc dot gnu.org |msebor at gcc dot gnu.org Ever confirmed|0 |1 --- Comment #1 from Martin Sebor <msebor at gcc dot gnu.org> --- Confirmed. The warning is the result of splitting -Wformat-truncation out of the -Wformat-length warning in r244210. Based on the note ("format output between 22 and 32 bytes") 32 sounds like the right size. Let me do a build with BOOT_CFLAGS='-O0' to see if there are any other problems and fix them all.