HPCC Systems 8.6.x Releases

Welcome to the Red Book for HPCC Systems^® 8.6.x series.

You may benefit from glancing at other Red Book entries when making a large jump between releases.

Here's how to contact us if you find an issue or want to add something to the Red Book:

To raise an issue, use our Community Issue Tracker. Please create yourself an account if you don't already have one, to get automatic updates as your issue progresses through the workflow.
To ask a developer a technical question about something you are doing or have encountered, post in the Forums on Stack Overflow.
We invite you to post your questions on Stack Overflow utilizing the tag hpcc-ecl (https://stackoverflow.com/search?tab=newest&q=hpcc-ecl).
To add a note to the RedBook, please contact Jim DeFabia with full details.

Embedded C++ using the libz library.

In 8.6 there is a change that affects embedded c++ code using routines from the libz library, such as the "uncompress()" routine.
Prior to 8.6, the ECL would compile and run. Using version 8.6 or later, you may get an error similar to the one below about uncompress() or any other libz routine used as "unresolved symbols".

^{Error loading /var/lib/HPCCSystems/queries/<thorname>/libW20220728-123456.so: undefined symbol: uncompress}

^{The solution is to provide an additional line into the embedded c++ code:}

^{#option library 'z'}