[all-commits] [llvm/llvm-project] 68c507: unwind: use a more portable endianness check in EHABI

[Saleem Abdulrasool via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 68c50708d1f2b9aee3f10ec710df0b1387f701e5
      https://github.com/llvm/llvm-project/commit/68c50708d1f2b9aee3f10ec710df0b1387f701e5
  Author: Saleem Abdulrasool <compnerd at compnerd.org>
  Date:   2020-05-29 (Fri, 29 May 2020)

  Changed paths:
    M libunwind/src/Unwind-EHABI.cpp

  Log Message:
  -----------
  unwind: use a more portable endianness check in EHABI

The ARM specific code was trying to determine endianness using the
`__LITTLE_ENDIAN__` macro which is not guaranteed to be defined.
When not defined, it makes libunwind to build the big-endian code even
when the compiler builds for a little-endian target.

This change allows building libunwind with the `musl-gcc` toolchain
which does not define `__LITTLE_ENDIAN__`.  Use `__BYTE_ORDER__`
instead.

Patch by Idan Freiberg!