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These variable templates give warnings in C++11 mode when -Wsystem-headers is used: In file included from /home/jwakely/gcc/7/include/c++/7.0.0/memory:77:0, from vt.cc:1: /home/jwakely/gcc/7/include/c++/7.0.0/bits/uses_allocator.h:130:20: warning: variable templates only available with -std=c++14 or -std=gnu++14 constexpr bool __is_uses_allocator_constructible_v = ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ /home/jwakely/gcc/7/include/c++/7.0.0/bits/uses_allocator.h:141:20: warning: variable templates only available with -std=c++14 or -std=gnu++14 constexpr bool __is_nothrow_uses_allocator_constructible_v = ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ We don't need them, so let's only define them for C++14 and up. * include/bits/uses_allocator.h (__is_uses_allocator_constructible_v) (__is_nothrow_uses_allocator_constructible_v): Only define for C++14 and later. Tested powerpc64le-linux, committed to trunk.
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