[all-commits] [llvm/llvm-project] efbe98: [llvm] simplify and clean-up DemangleConfig.h (#14...

[Andrew Rogers via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: efbe98db0029a97109ec0b4db51f46af1ce8e581
      https://github.com/llvm/llvm-project/commit/efbe98db0029a97109ec0b4db51f46af1ce8e581
  Author: Andrew Rogers <andrurogerz at gmail.com>
  Date:   2025-07-22 (Tue, 22 Jul 2025)

  Changed paths:
    M llvm/include/llvm/Demangle/DemangleConfig.h

  Log Message:
  -----------
  [llvm] simplify and clean-up DemangleConfig.h (#149163)

## Purpose
Simplify `DEMANGLE_` macro definitions in
`llvm/Demangle/DemangleConfig.h` for clarity/maintainability.

## Overview
* Alias `DEMANGLE_DUMP_METHOD`, `DEMANGLE_FALLTHROUGH`, and
`DEMANGLE_UNREACHABLE` macros to their `LLVM_` counterparts defined in
`llvm/Support/Compiler.h`
* Remove several `DEMANGLE_`-prefixed macros that were only used within
`DemangleConfig.h`

## Background
* It should be safe for the `Demangle` component library to depend on
`Support`, so there is no need for it to maintain copies of macros
defined in `llvm/Support/Compiler.h`.
* Since the canonical copy `llvm/Demangle/ItaniumDemangle.h` lives under
`libcxxabi`, it cannot directly reference the `LLVM_`-prefixed macros so
we define `DEMANGLE_`-prefixed aliases.

## Validation
* Built llvm-project on Windows with `clang-cl` and MSVC `cl`.
* Built llvm-project on Linux with `clang` and `gcc`.



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