https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68737
--- Comment #32 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The releases/gcc-8 branch has been updated by Jonathan Wakely <r...@gcc.gnu.org>: https://gcc.gnu.org/g:c54d4e218f18c66ce1ad9d7e7762357fd7edacb7 commit r8-10367-gc54d4e218f18c66ce1ad9d7e7762357fd7edacb7 Author: Jonathan Wakely <jwak...@redhat.com> Date: Mon Jan 28 23:58:57 2019 +0000 PR libstdc++/68737 Do not use vsnprintf on HPUX It doesn't conform to the spec, so use vsprintf with a large buffer instead. PR libstdc++/68737 * config/locale/generic/c_locale.h (__convert_from_v) [_GLIBCXX_USE_C99_STDIO]: Also check _GLIBCXX_HAVE_BROKEN_VSNPRINTF. * config/os/hpux/os_defines.h: Define _GLIBCXX_HAVE_BROKEN_VSNPRINTF. * include/bits/locale_facets.tcc (num_put::_M_insert_float) [_GLIBCXX_USE_C99_STDIO]: Also check _GLIBCXX_HAVE_BROKEN_VSNPRINTF. (cherry picked from commit c98f255154798847bdd1fc6ce33266c1a1ddc13a)