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Chapter 5. Changes in LLVM Toolset

LLVM Toolset has been updated from version 13.0.1 to 14.0.6 on RHEL 7, RHEL 8, and RHEL 9.

Notable changes include:

  • On 64-bit x86, support for AVX512-FP16 instructions has been added.
  • Support for the Armv9-A, Armv9.1-A and Armv9.2-A architectures has been added.
  • On PowerPC, added __ibm128 type to represent IBM double-double format, also available as __attribute__mode(IF).

clang changes:

  • 'if consteval' for C++2b is now implemented.
  • On 64-bit x86, support for AVX512-FP16 instructions has been added.
  • Completed support of OpenCL C 3.0 and C++ for OpenCL 2021 at experimental state.
  • The -E -P preprocessor output now always omits blank lines, matching GCC behavior. Previously, up to 8 consecutive blank lines could appear in the output.
  • Support -Wdeclaration-after-statement with C99 and later standards, and not just C89, matching GCC’s behavior. A notable use case is supporting style guides that forbid mixing declarations and code, but want to move to newer C standards.

For detailed information regarding the updates, see the upstream LLVM 14.0.0 Release Notes.

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