https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86846
--- Comment #10 from Jonathan Wakely <redi at gcc dot gnu.org> --- Author: redi Date: Tue Aug 14 13:13:37 2018 New Revision: 263536 URL: https://gcc.gnu.org/viewcvs?rev=263536&root=gcc&view=rev Log: PR libstdc++/86846 Alternative to pointer-width atomics Define a class using std::mutex for when std::atomic<memory_resource*> cannot be used to implement the default memory resource. When std::mutex constructor is not constexpr the constant_init trick won't work, so just define a global and use init_priority for it. The compiler warns about using reserved priority, so put the definition in a header file using #pragma GCC system_header to suppress the warning. PR libstdc++/86846 * src/c++17/default_resource.h: New file, defining default_res. * src/c++17/memory_resource.cc [ATOMIC_POINTER_LOCK_FREE != 2] (atomic_mem_res): Define alternative for atomic<memory_resource*> using a mutex instead of atomics. Added: trunk/libstdc++-v3/src/c++17/default_resource.h Modified: trunk/libstdc++-v3/ChangeLog trunk/libstdc++-v3/src/c++17/memory_resource.cc
