[PATCH] D139450: Warn about unsupported ibmlongdouble

[Tulio Magno Quites Machado Filho via Phabricator via cfe-commits]

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When -mabi=ieeelongdouble is enabled by default, libc++ does not support
-mabi=ibmlongdouble.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D139450

Files:
  clang/lib/Driver/ToolChains/PPCLinux.cpp
  clang/lib/Driver/ToolChains/PPCLinux.h
  clang/test/Driver/lit.local.cfg
  clang/test/Driver/ppc-float-abi-warning.cpp
  clang/test/lit.site.cfg.py.in

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