[ARROW-4023] [Gandiva] Address long CI times in macOS builds

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Not A Problem
• Fix Version/s: 0.13.0
• Component/s: C++ - Gandiva
• External issue URL: https://github.com/apache/arrow/issues/20625
• Assignee: Unassigned
• Reporter: Wes McKinney
• Created: 13/Dec/18 22:26
• Updated: 11/Jan/23 07:31
• Resolved: 08/Feb/19 04:41

Description

I noticed that installing the toolchain and building Gandiva on macOS in Travis CI took over 30 minutes in a recent build

https://travis-ci.org/apache/arrow/jobs/467681438#L113

The overall build took ~45 minutes, so this build isn't far away from timing out.

It seems that this could be partly caused by installing some heavy dependencies like llvmdev from conda-forge. conda-forge has been getting a lot slower lately.

We should see if using defaults to install llvmdev will improve build times, or if there's a faster way to get the toolchain bootstrapped.