gdb: Import AX_CXX_COMPILE_STDCXX from the GNU Autoconf Archive
This macro throws C++11 code at the compiler in order to check whether
it supports C++11. final/override, rvalue references, static_assert,
decltype, auto, constexpr, etc., and adds -std=gnu++11 to CXX if
necessary.
Nothing uses the macro yet. Simply adding it as separate preliminary
step because we'll need local changes.
gdb/ChangeLog
2016-10-28 Pedro Alves <palves@redhat.com>
* ax_cxx_compile_stdcxx.m4: New file.
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