fixed mixed static/shared builds.

v0.4.9

Reorder thread shutdown so that only truly necessary memory is still …

Made AWS_ENABLE_LTO an option

AWS_ENABLE_LTO=ON|OFF now controls LTO globally (#504)

* AWS_ENABLE_LTO=ON|OFF now controls LTO globally

* Made AWS_ENABLE_LTO an option

Added support for thread exit callbacks

Added support for thread exit callbacks (#503)

* Added support for thread exit callbacks

* Added user data support to aws_thread_call_once

LTO support for Clang/GCC

LTO support (#499)

* Added IPO/LTO support to cmake

* Removed the requirement that release builds produce good backtrace output

* Check for IPO policy in older versions of CMake

* Add policy existence check to c flags

Bug fixes and unified library init/shutdown

Move allocator functions to their own file (#488)

* Move the allocator related functions to allocator.c

* Add overrides for the allocator functions

* PR Comments

Atomics support extended back to gcc 4.1.2 on Intel

Relaxed constraints on gcc+x86/x64 to gcc 4.1.2 (#482)

* Relaxed constraints on gcc+x86/x64 to gcc 4.1.2, added ARM and Itanium detection for gcc 4.4

Use CMake Threads module instead of manual pthreads linking

v0.4.3

Depend on pthreads via Threads rather than manually (#473)

Fix error info

Fixed issue where the wrong info was returned for some error codes.

Logging refactor

Add yaml file for aws_byte_buf_cat proof (#448)

* Proof harness for aws_byte_buf_cat with a fixed number of arguments

Task logging

Adds string tags to tasks and task logging for easier identification