[PATCH] D152856: [Driver] Allow warning for unclaimed TargetSpecific options

[Fangrui Song via Phabricator via cfe-commits]

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For unclaimed target-agnostic options, we can apply clang_ignored_gcc_optimization_f_Group
to accept but warn about them.

  % clang -c -fexpensive-optimizations a.c
  clang: warning: optimization flag '-fexpensive-optimizations' is not supported [-Wignored-optimization-argument]

For an unclaimed target-specific option, one target may want to accept but warn
about it. Add `llvm::opt::Arg::IgnoredTargetSpecific` to support this warning
need.

Close https://github.com/llvm/llvm-project/issues/63282


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D152856

Files:
  clang/include/clang/Driver/Options.td
  clang/lib/Driver/Driver.cpp
  clang/lib/Driver/ToolChains/Arch/LoongArch.cpp
  clang/lib/Driver/ToolChains/MinGW.cpp
  llvm/include/llvm/Option/Arg.h
  llvm/lib/Option/Arg.cpp

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