Changelog for libobjc4_6-1.9-bp153.1.63.x86_64.rpm :

* Tue Mar 19 2019 Jan Engelhardt - Replace historic boilerplate descriptions.- Fixup RPM group of SRPM package.
* Fri Feb 15 2019 Luigi Baldoni - Update to version 1.9
* Support for 64-bit ARM (AArch64) processors, including assembly fast paths for message sending.
* Improved the dispatch table representation to improve performance and cache usage on the fast path.
* The implementation of `imp_implementationWithBlock`, the function that allows blocks to be used as methods, no longer requires physical pages to be mapped both writeable and executable.
* Numerous improvements to the interaction between runtime functions and ARC.
* Support for Thumb-2 interworking on ARM. Note that the library must be compiled for ARMv7 or ARMv6T2 for this code to be enabled. Once it has been, other Objective-C binaries linked with the library can be compiled as ARM or Thumb-2 code. This will also generate Thumb-2 message send functions, improving instruction cache usage.
* Significant improvements to ARC, including + The runtime no longer acquires a global lock on every object deallocation (a global lock is still used for objects that have weak references).
*NOTE:
* This is incompatible with other code directly inspecting the reference count and will break with older versions of GNUstep Base! + Weak references use a scheme closer to C++ `std::weak_pointer` and are lazily zeroed on access. This reduces the space overheads for weak references. + Some additional helper functions are added for use in `NSObject` and other root classes, which simplifies the layering between the runtime and the Foundation (or equivalent) implementation.
* Improvements to how the runtime handles layout of ivars with strong alignment requirements, which should fix issues relating to using vector types in Objective-C objects.
* The option to build a separate libobjcxx has been removed. The runtime will now depend on the C++ standard library implementation if no useable C++ runtime is available. Note that C++ exception interworking does not work because LLVM\'s libc++abi (shipped by Apple) does not provide GNU-compatible hooks and so Objective-C++ exception support will be automatically disabled on this platform. Any other platforms shipping libc++abi should consider either GNU libsupc++ or libcxxrt as an alternative.- Renamed library package to reflect its SONAME- Fixes (boo#1120915)
* Mon Jan 23 2017 aloisioAATTgmx.com- Update to version 1.8.1- Fixed Leap 42.1/42.2 build- Removed _service in favour of a tarball in order to be accepted into Factory- Spec cleanup