[PATCH] D139720: [clang][PPC] Checking Unknown Values Passed to -mcpu

[Qiongsi Wu via Phabricator via cfe-commits]

qiongsiwu1 created this revision.
qiongsiwu1 added reviewers: nemanjai, amyk.
qiongsiwu1 added a project: clang.
Herald added subscribers: shchenz, kbarton.
Herald added a project: All.
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Herald added subscribers: cfe-commits, MaskRay.

Currently `ppc::getPPCTargetCPU` returns an empty string when it encounters an unknown value passed to `-mcpu`. This causes `clang` to ignore unknown `-mcpu` values silently.

This patch changes the behaviour of `ppc::getPPCTargetCPU` so that it passes the unknown option to the backend, so the backend can actually check if the CPU string is supported, and report an error when encountering unknown/unsupported CPU string.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D139720

Files:
  clang/lib/Driver/ToolChains/Arch/PPC.cpp
  clang/lib/Driver/ToolChains/Arch/PPC.h
  clang/lib/Driver/ToolChains/CommonArgs.cpp
  clang/test/Driver/ppc-cpus.c

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