https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68737
--- Comment #19 from dave.anglin at bell dot net --- On 2018-09-04 12:35 PM, redi at gcc dot gnu.org wrote: > https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68737 > > --- Comment #18 from Jonathan Wakely <redi at gcc dot gnu.org> --- > I don't think we care about glibc < 2.0.6 though. > > __max_digits * 4 is not enough for: > > std::cout << std::fixed << std::numeric_limits<long double>::max(); > > That needs 4940 bytes, but we don't want to unconditionally alloca that > amount. > > Maybe: > > --- a/libstdc++-v3/include/bits/locale_facets.tcc > +++ b/libstdc++-v3/include/bits/locale_facets.tcc > @@ -1008,6 +1008,11 @@ _GLIBCXX_BEGIN_NAMESPACE_LDBL > __len = std::__convert_from_v(_S_get_c_locale(), __cs, __cs_size, > __fbuf, __v); > > +#ifdef __hpux > + if (__len == -1) > + __len = __cs_size = 5000; > +#endif > + > // If the buffer was not large enough, try again with the correct > size. > if (__len >= __cs_size) > { > @@ -1020,6 +1025,11 @@ _GLIBCXX_BEGIN_NAMESPACE_LDBL > __len = std::__convert_from_v(_S_get_c_locale(), __cs, > __cs_size, > __fbuf, __v); > } > + > +#ifdef __hpux > + if (__len == -1) > + return __s; > +#endif > #else > // Consider the possibility of long ios_base::fixed outputs > const bool __fixed = __io.flags() & ios_base::fixed; > Testing.
