Version 1 5 7 Released

<!-- .. title: Version 1.5.7 released .. slug: version-1-5-7-released .. date: 2019-02-13 23:50:00 UTC .. tags: Releases .. category: .. link: .. description: .. type: text -->

This is a bugfix release.

Broker

• Fix build failure when using WITH_ADNS=yes
• Ensure that an error occurs if per_listener_settings true is given after other security options. Closes #1149.
• Fix include_dir not sorting config files before loading. This was partially fixed in 1.5 previously.
• Improve documentation around the include_dir option. Closes #1154.
• Fix case where old unreferenced msg_store messages were being saved to the persistence file, bloating its size unnecessarily. Closes #389.

Library

• Fix mosquitto_topic_matches_sub() not returning MOSQ_ERR_INVAL for invalid subscriptions like topic/#abc. This only affects the return value, not the match/no match result, which was already correct.

Build

• Don't require C99 compiler.
• Add rewritten build test script and remove some build warnings.