https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89090
--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> --- Author: redi Date: Tue Feb 5 14:44:56 2019 New Revision: 268536 URL: https://gcc.gnu.org/viewcvs?rev=268536&root=gcc&view=rev Log: PR libstdc++/89090 avoid C++17 features in C++11/C++14 code Although GCC and Clang both allow these features pre-C++17 in system headers, Clang does issue warnings with -Wsystem-headers. It can also complicate bisection and/or testcase reduction if # line markers are stripped, because the code won't be known to come from system headers. PR libstdc++/89090 * include/bits/stl_uninitialized.h (__relocate_a_1): Make unused parameter unnamed. Add message to static assertion. * include/bits/vector.tcc (vector::reserve, vector::_M_realloc_insert) (vector::_M_default_append): Use _GLIBCXX17_CONSTEXPR for if constexpr in C++11 code. Modified: trunk/libstdc++-v3/ChangeLog trunk/libstdc++-v3/include/bits/stl_uninitialized.h trunk/libstdc++-v3/include/bits/vector.tcc
