Announcing 1.21.0 of libbson and libmongoc, the libraries constituting the MongoDB C Driver.

libbson

Bug Fixes:

• Addressed VS 2013 build failures due to missing C99 features.

Improvements:

• Addressed -Wstrict-prototype warnings in bson-atomic.h.
• Addressed incompatible pointer warnings in bson-atomic.h on GCC 4.8.5.

libmongoc

Bug Fixes:

• Addressed VS 2013 build failures due to missing C99 features.

Features:

• Support conditional $merge and $out aggregation on secondaries.
• Bump minimum wire protocol version from 3 (MongoDB 3.0) to 6 (MongoDB 3.6).
• Bump maximum wire protocol version from 14 (MongoDB 5.1) 13 (MongoDB 5.0) to 15 (MongoDB 5.2).

Improvements:

• Update algorithm used for generation of OID values to reduce collisions.

Links:

• mongo-c-driver-1.21.0.tar.gz
• All the issues resolved in 1.21.0
• Documentation

Thanks to everyone who contributed to this release.

• Ezra Chung
• Colby Pike
• Kevin Albertson
• Roberto C. Sánchez
• David CARLIER
• Jeremy Mikola
• Pau Espin Pedrol
• Ryan Schmidt