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Chapter 5. Changes in LLVM Toolset
LLVM Toolset has been updated from version 11.0.0 to 12.0.1 on RHEL 7 and RHEL 8. RHEL 9 Beta is distributed with LLVM Toolset 12.0.1. Notable changes include:
-
The new compiler flag
-march=x86-64-v[234]has been added. -
The compiler flag
-fasynchronous-unwind-tablesof theclangcompiler is now the default on Linux AArch64/PowerPC. -
The
clangcompiler now supports the C++20 likelihood attributes [[likely]] and [[unlikely]]. -
The new function attribute
tune-cpuhas been added. It allows microarchitectural optimizations to be applied independently from thetarget-cpuattribute or TargetMachine CPU. -
The new sanitizer
-fsanitize=unsigned-shift-basehas been added to the integer sanitizer-fsanitize=integerto improve security. - Code generation on PowerPC targets has been optimized.
- The WebAssembly backend is now enabled in LLVM. With this enhancement, you can generate WebAssembly binaries with LLVM and Clang.
For detailed information regarding the updates, see the upstream LLVM 12.0.0 Release Notes.
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