[flang-commits] [flang] [flang] fix skip-external-rtti-definition for ppc (PR #146826)

[Tom Eccles via flang-commits]

https://github.com/tblah approved this pull request.

Looks sensible to me. Normally I would say wait for @kkwli, but it seems worth fixing the buildbot failure asap

https://github.com/llvm/llvm-project/pull/146826