[IMPALA-13354] Add mode to build the toolchain with Clang

• Type: Task
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: Impala 4.5.0
• Component/s: Infrastructure
• Epic Link: Clang toolchain build
• Epic Color: ghx-label-11
• Assignee: Unassigned
• Reporter: Joe McDonnell
• Created: 03/Sep/24 22:38
• Updated: 03/Sep/24 23:04

Description

A first possible increment for building the toolchain with Clang would continue to use libstdc++ from our toolchain GCC. In that world, a patch would need to do:

1. Build clang after building GCC in init-compiler.sh
2. Setup CC/CXX to point to clang
3. Add --gcc-toolchain to the CFLAGS/CXXFLAGS
4. Add variables in init.sh to toggle building with clang and the clang version (e.g. USE_CLANG and CLANG_VERSION)
5. Modify the COMPILER and COMPILER_VERSION so tarballs have distinct names
6. Add a way to build modern LLVM from a unified tarball