[all-commits] [llvm/llvm-project] ef2735: [Flang] Detect endianness in the preprocessor (#13...

[Joseph Huber via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: ef2735d2436fd14288d1766a152f3a10f36a4af9
      https://github.com/llvm/llvm-project/commit/ef2735d2436fd14288d1766a152f3a10f36a4af9
  Author: Joseph Huber <huberjn at outlook.com>
  Date:   2025-03-24 (Mon, 24 Mar 2025)

  Changed paths:
    M flang/cmake/modules/FlangCommon.cmake
    M flang/include/flang/Common/api-attrs.h
    M flang/include/flang/Evaluate/common.h

  Log Message:
  -----------
  [Flang] Detect endianness in the preprocessor (#132767)

Summary:
Currently we use `TestBigEndian` in CMake to determine endianness. This
doesn't work on all platforms and is deprecated since CMake 3.20.
Instead of using CMake, we can just use the GNU/Clang preprocessor
definitions.

The only difficulty is MSVC, mostly because they don't support the same
macros. But, as far as I'm aware, MSVC / Windows targets are always
little endian, and if not we can just override it for that specific
target in the future.



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