https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78696
Martin Sebor <msebor at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |ASSIGNED Assignee|unassigned at gcc dot gnu.org |msebor at gcc dot gnu.org --- Comment #4 from Martin Sebor <msebor at gcc dot gnu.org> --- The optimization can be disabled for format strings containing floating point directives by using -frounding-math. The locale-specific radix character is a POSIX extension to C that I missed. I agree that it means that the optimization cannot be enabled when there are floating point directives in the format string that may include it.