Thanks to your feedback and submitted issues we have a few bug fixes.

Support variable order curves in the python bindings. (Issue 458)

Support mingw64 by adding a missing include. (Issue 459)

Thanks to your feedback, pull requests, and submitted issues we have A
few bugs and build enhancements.

Combine CMake feedback from several PRs and issues. (PR457)

Protect from potential buffer overrun because of malformed dimensions.
(Issue 453)

Fix a typo in the python bindings but leave the misspelled member
(kkVisibilityVisible) to maintain compatibility. (Issue 440)

Add unicode filename support for Windows (PR450)

Make some of the extra python scripts including the PyAlembic and Maya
unit tests python 3 compatible. (PR438)

Thanks to your feedback pull requests and submitted issues we
have a few bug fixes and build enhancements.

CMake:

Introduce CPacke to top level CMake. (PR 425)

AbcCoreOgawa:

Fix typo in a comment. (PR 417)

AbcGeom:

Fix bug with OCurves, ONuPatch, OPoints, OPolyMesh, and OSubD were not properly
incrementing their number of set samples when using setFromPrevious. (PR 433)

Util:

Fix default values for float PODTraits. (PR 422)

Windows:

Support compiling with mingw. (PR 434)
Explicitly call CreateFileA and CreateFileMappingA (instead of CreateFile and
CreateFileMapping) since we are using std::string to open the file. (PR 435)

AbcStitcher:

Introduce -hold argument which will use the previous set sample instead of
setting an empty sample for missing samples. (PR 432)

Thanks to your feedback pull requests and submitted issues we have a few bug fixes and build enhancements.

Add test for fuzzer issue 53406. (PR415)

Address Issue 402 by not using deprecated kWrapExisting calls when possible.

Add missing vertex for cube test in the python bindings per Issue 407.

Fix several warnings mentioned in Issue 309, 398 and 412. (PR413, PR414 and PR416)

CMake:

Don't explicitly set MACOSX_RPATH as it is set by default in CMake 3+. (PR404)

Use install rpath for Imath 3. (PR405)

Use STRING instead of PATH for ALEMBIC_LIB_INSTALL_DIR. (PR406)

GitHub:

Add CIFuzz as a GitHub action. (PR403)

Thanks to your feedback pull requests and submitted issues we
have a few bug fixes and build enhancements.

CMake:

Add ALEMBIC_DEBUG_WARNINGS_AS_ERRORS to control the build in debug mode.
It is set to ON by default to preserve the current behavior.
Use add_compile_options instead of the older add_definitions. (PR371)

Fix the include dirs for AbcCoreHDF5 tests. (PR382)

Fix issue hinted at in Issue 223: use PROJECT_SOURCE_DIR instead of
CMAKE_SOURCE_DIR when embedding Alembic within another CMake project. (PR393)

AbcCoreOgawa:

On Windows _BitScanForward64 is only available when _WIN64 is defined.
When it is not, fall back on using _BitScanForward. (PR 373)

Fuzzer issue 49213 turned up some new malformed MetaData memory problems.
Indexed MetaData on the write side only allows 254 (plus the default empty one)
small (up to 256 bytes), we now throw if we encounter malformed MetaData.
We were also allowing empty property and object names through on the read side
even though the writer forbids this.
Finally integrate a couple of tests flagged by Taotao Gu's local fuzzer.
(PR391 and PR397)

Fuzzer issue 52939 showed that with certain malformed MetaData the pair
separator should NOT occur before the assign separator. (PR396)

PyAlembic:

N2f and N2d properties were not being correctly bound.(PR390)

Thanks to your feedback and submitted issues we have a few bug fixes.

Make sure we export the IlmBase requirement in CMake when using OpenEXR 2 to
fulfill the Imath requirement. (Issue 355)

Address report from GCC Undefined Behavior Sanitizer by initializing a couple
of bools in OXform. (Issue 357)

Fix compile issue when using C++17 with Microsoft Visual Studio and use a
hopefully much faster find first bit set when using that compiler. (Issue 358)

Thanks to your feedback and submitted issues we have a few bug fixes.

Ogawa:
One of the fuzzer tests were was failing with 32 bit builds because of adifferent exception message.
Fix a bug with 32 bit memory mapped Windows builds.

CMake:
Look for boost python a little differently, falling back on existing behavior.

Thanks to your feedback and submitted issues we have a few bug fixes.

CMake:

Get the python bindings building on MacOS. (Issue 340)

Fix the capitalization of the Imath find_depencency in AlembicConfig.cmake
so that Imath will be found when used by external projects.
(Issue 341 and 343)

Ogawa:

Address Fuzzer issue 33685 sanity check that we have a valid group to avoid
infinite recursion during traversal.

Thanks to your feedback and issues we have a few bug fixes and enhancements.

API:

We are dropping support for the ancient TR1 and expect the compilers to at least support C++std11, we currently default to C++std14. Because we now assume at least C++std11, we can remove ALEMBIC_LIB_USES_TR1 and ALEMBIC_LIB_USES_BOOST and we instead expect the std versions of things like shared_ptr. (Issue 312)

Ogawa:

Better support emscripten and ARM toolchains by using memcpy to avoid dereferencing non-aligned pointers. (PR 332)

Python:

Support building python3, and make it the default, to build the bindings against python2 use: -DUSE_PYALEMBIC=ON -DPYALEMBIC_PYTHON_MAJOR=2

Switch from nonzero to bool for the python3 bindings. (Issue 273)

Workaround the testCollections crash. (Issue 274)

Make the unit tests python 2 and python 3 compatible. (Issue 276)

Rework the python testing framework so they can be run from CMake. (Issue 278)

Switch from next to next for the python3 bindings. (Issue 279)

Utils:

AbcStitcher:

Propagate MetaData from the first of our ordered input archives over to the stitched output. (PR 324)

CMake:

Update the minimum requirement to 3.13

Overhaul to support the recently released Imath 3.
(https://github.com/AcademySoftwareFoundation/Imath)

Fix for using Alembic as a 3rd party with Imath 3. (Issue 337)

Use Boost_VERSION_MACRO instead of Boost_VERSION. (PR 338)

Thanks to your feedback and issues we have a few bug fixes and enhancements.

API:

We are dropping support for the ancient TR1 and expect the compilers to at
least support C++std11, we currently default to C++std14. Because we now
assume at least C++std11, we can remove ALEMBIC_LIB_USES_TR1 and
ALEMBIC_LIB_USES_BOOST and we instead expect the std versions of things like
shared_ptr. (Issue 312)

Ogawa:

Better support emscripten and ARM toolchains by using memcpy to avoid
dereferencing non-aligned pointers. (PR 332)

Python:

Support building python3, and make it the default, to build the bindings
against python2 use: -DUSE_PYALEMBIC=ON -DPYALEMBIC_PYTHON_MAJOR=2

Switch from nonzero to bool for the python3 bindings. (Issue 273)

Workaround the testCollections crash. (Issue 274)

Make the unit tests python 2 and python 3 compatible. (Issue 276)

Rework the python testing framework so they can be run from CMake. (Issue 278)

Switch from next to next for the python3 bindings. (Issue 279)

Utils:

AbcStitcher:

Propagate MetaData from the first of our ordered input archives over to the
stitched output. (PR 324)

CMake:

Update the minimum requirement to 3.13

Overhaul to support the recently released Imath 3.
(https://github.com/AcademySoftwareFoundation/Imath)

Fix for using Alembic as a 3rd party with Imath 3. (Issue 337)

Use Boost_VERSION_MACRO instead of Boost_VERSION. (PR 338)