[IMPALA-13351] Add support for building the toolchain with Clang

• Type: Epic
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: Impala 4.5.0
• Component/s: Infrastructure
• Epic Name: Clang toolchain build
• Epic Color: ghx-label-8
• Assignee: Unassigned
• Reporter: Joe McDonnell
• Created: 03/Sep/24 22:13
• Updated: 03/Sep/24 22:42

Description

The toolchain currently builds with GCC 10.4.0. Being able to build with Clang could be useful:

1. More extensive TSAN: TSAN is more effective when dependencies have been built with TSAN enable. This can help for cases like Boost.
2. Comparing Clang performance to GCC: Clang has seen significant development from Google and others, and it would be nice to know if Clang is faster than GCC for Impala. Recent versions of Snappy (>=1.1.9) are known to run faster on Clang than GCC by substantial margins.
3. MacOS uses a compiler based on Clang