We recently released version 6.8.2 of our ASN1C ASN.1 Compiler product. This is a patch release that addressed a number of issues discovered over the past few months. An update of note was adding the capability to to use the -table-unions option when generating C/C++ pure-parser code. Previously, only the legacy table constraints option (-tables) was supported which produced code that was not thread-safe and which was not as performant as code generated using the table unions model.
For a full list of changes that went into this release, please consult the Change Log.