OK, thanks. Is there a workaround for this issue on the gcc user side? (I guess I could always avoid using libstdc++ and go with libc++ instead.) I don't have any constraints when it comes to ABI breakage. Regards, /Johan Alfredsson On Fri, Sep 15, 2017 at 3:34 PM, Marc Glisse <marc.glisse@xxxxxxxx> wrote: > On Fri, 15 Sep 2017, Marc Glisse wrote: > > On Fri, 15 Sep 2017, Johan Alfredsson wrote: >> >> I ran into a symbol name difference linking an executable compiled with >>> clang 5.0 vs. compiling with gcc 7.1.0 on Solaris/SPARC. >>> >>> In bits/locale_facets_nonio.tcc, there is the following template: >>> >>> template<typename _CharT, typename _OutIter> >>> _OutIter >>> time_put<_CharT, _OutIter>:: >>> put(iter_type __s, ios_base& __io, char_type __fill, const tm* __tm, >>> const _CharT* __beg, const _CharT* __end) const >>> >>> Looking at the symbol in libstdc++.so corresponding to the instantiation >>> of >>> time_put<char, std::ostreambuf_iterator<char, std::char_traits<char>>>, >>> it >>> is >>> >>> _ZNKSt8time_putIcSt19ostreambuf_iteratorIcSt11char_ >>> traitsIcEEE3putES3_RSt8ios_basePK2tmPKcSB_ >>> >>> This corresponds to (according to c++filt): >>> >>> std::time_put<char, std::ostreambuf_iterator<char, >>> std::char_traits<char> > >>> >>>> ::put(std::ostreambuf_iterator<char, std::char_traits<char> >, >>>> >>> std::ios_base&, tm const*, char const*, char const*) const >>> >>> Now, linking the executable compiled with clang 5.0 results in an error >>> about a missing symbol. That symbol is: >>> >>> std::time_put<char, std::ostreambuf_iterator<char, >>> std::char_traits<char> > >>> >>>> ::put(std::ostreambuf_iterator<char, std::char_traits<char> >, >>>> >>> std::ios_base&, std::tm const*, char const*, char const*) const >>> >>> where the difference is that the type tm is now std::tm. >>> >>> It seems to me that std::tm should be the proper type here, but I might >>> be >>> wrong. >>> >>> Comments? >>> >> >> This was done on purpose when we changed __cplusplus from 1 to 199711, to >> avoid breaking the ABI. On Solaris, we will mangle std::tm as if it was >> ::tm until the next ABI break (probably not soon). >> > > https://bugs.llvm.org/show_bug.cgi?id=33767 > > -- > Marc Glisse >
