[clang] [llvm] [PowerPC] Take ABI into account for data layout (PR #149725)

[via cfe-commits]

RolandF77 wrote:

To start I have some questions.

Is the purpose of this PR to enable codegen on BE distros that use Elf V2, or is the purpose to use -mabi to dynamically switch between ABIs on some theoretical platform? If it's the former, I think we don't need to talk about -mabi. I am not opposed to the idea of Elf V2 on BE in principle. There are some practical concerns.

What level of testing has been done of execution of Elf V2 BE LLVM codegen in the native environment? What is the level of commitment to ongoing development/support of this environment? Are you volunteering to configure and maintain a bot for LLVM continuous testing? Without a bot there are likely to be issues with stability. Non-standard ABI variants are not a priority for maintainers, so implementation and bug fixing for this configuration are likely to have to rely on those who are interested.

https://github.com/llvm/llvm-project/pull/149725