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Reduce compiler warnings when boost uses std-atomics

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This works around for compilers with non-static-data-member
initialization.

spinlock_t is-a struct { lockType _; } and BOOST_DETAIL_SPINLOCK_INIT
initializes the first member of the struct.
All defines of BOOST_DETAIL_SPINLOCK_INIT include c-style curly braces
to initialize the struct's data member.

However, modern C++ compiler interpret the braces differently resulting
in copy constriction of the initializer.
This commit is contained in:
Robin Gareus 2019-07-28 20:10:09 +02:00
parent 684b364a8a
commit 6d4b94df13
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1 changed files with 9 additions and 2 deletions
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11
libs/pbd/spinlock.cc
View file

@ -28,10 +28,17 @@
using namespace PBD;
spinlock_t::spinlock_t ()
#ifdef BOOST_SMART_PTR_DETAIL_SPINLOCK_STD_ATOMIC_HPP_INCLUDED
/* C++11 non-static data member initialization,
* with non-copyable std::atomic ATOMIC_FLAG_INIT
*/
: l {BOOST_DETAIL_SPINLOCK_INIT} {}
#else
/* default C++ assign struct's first member */
{
boost::detail::spinlock init = BOOST_DETAIL_SPINLOCK_INIT;
std::memcpy (&l, &init, sizeof (init));
l = BOOST_DETAIL_SPINLOCK_INIT;
}
#endif
SpinLock::SpinLock (spinlock_t& lock)
: _lock (lock)