Opened 4 years ago

Last modified 4 years ago

#9322 new Bugs

spinlock_gcc_arm.hpp fails when building iOS arm64

Reported by: Joe Radjavitch <joerad11@…> Owned by: Peter Dimov
Milestone: To Be Determined Component: smart_ptr
Version: Boost 1.54.0 Severity: Problem
Keywords: Cc:


I am using boost in my iOS and Android applications and building for arm64 in iOS fails in spinlock_gcc_arm because the the SWP instruction and LDREX are not part of the arm64 instruction set. I do not have enough knowledge about the ARM assembly instructions to implement a proper fix for this myself and was hopeful someone with more expertise could provide a fix for the next release (or a patch for the current, if possible).

Attachments (0)

Change History (11)

comment:1 Changed 4 years ago by viboes

Component: Nonesmart_ptr
Owner: set to Peter Dimov

comment:2 Changed 4 years ago by Peter Dimov

What compiler are you using?

comment:3 Changed 4 years ago by anonymous

Hello...I am trying to build using Xcode 5, which uses LLVM 5.0. Thanks.

comment:4 Changed 4 years ago by Peter Dimov

Does it support std::atomic?

comment:5 Changed 4 years ago by anonymous

Yes, I believe it does.

comment:6 Changed 4 years ago by Peter Dimov

I've added the ability to direct shared_ptr to use an std::atomic implementation by using #define BOOST_SP_USE_STD_ATOMIC. You can find the commit at Eventually, this implementation will be selected by default when std::atomic is autodetected to be present and functional, but for now, you can apply this patch, define the macro and see if that helps.

comment:7 Changed 4 years ago by anonymous

Running clang Apple LLVM version 5.0 (clang-500.2.79) (based on LLVM 3.3svn) like this:

clang++ -fvisibility=hidden" "-fvisibility-inlines-hidden" "-DBOOST_SP_USE_STD_ATOMIC" "-std=c++11" "-stdlib=libc++"

I get the following error:

In file included from ./boost/shared_ptr.hpp:17:
In file included from ./boost/smart_ptr/shared_ptr.hpp:34:
./boost/smart_ptr/detail/spinlock_pool.hpp:80:89: error: call to deleted constructor of 'std::atomic_flag' (aka 'std::__1::atomic_flag')
./boost/smart_ptr/detail/spinlock_std_atomic.hpp:81:38: note: expanded from macro 'BOOST_DETAIL_SPINLOCK_INIT'
/Applications/ note: expanded from macro 'ATOMIC_FLAG_INIT'
#define ATOMIC_FLAG_INIT {false}
/Applications/ note: function has been explicitly marked deleted here
    atomic_flag(const atomic_flag&) = delete;

comment:8 Changed 4 years ago by Peter Dimov

I get the same with clang 3.4 for Windows; looks like a clang bug, as MSVC and g++ have no problems with this code.

comment:10 Changed 4 years ago by Peter Dimov

What is the actual .cpp file that fails with the above error?

Modify Ticket

Change Properties
Set your email in Preferences
as new The owner will remain Peter Dimov.

Add Comment

E-mail address and name can be saved in the Preferences.

Note: See TracTickets for help on using tickets.