https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78977
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P1
CC| |jakub at gcc dot gnu.org,
| |msebor at gcc dot gnu.org
Component|c++ |middle-end
Target Milestone|--- |7.0
Summary|g++7 snprintf() of double |[7 Regression] g++7
|produces wrong code with |snprintf() of double
|-O3 |produces wrong code with
| |-O3
--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
You haven't provided a self-contained test, so it is hard to know exactly, but
I bet it is the -fprintf-return-value optimization. Try
-fno-printf-return-value if it helps, if it does, then we really need
self-contained small test.
Perhaps FreeBSD libc snprintf prints %g differently from what GCC expects,
rounds it differently etc.
