Fangrui Song a79995ca60 [Driver] Allow warning for unclaimed TargetSpecific options
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

Reviewed By: mstorsjo

Differential Revision: https://reviews.llvm.org/D152856
2023-06-16 08:32:25 -07:00
2023-06-15 10:34:33 -07:00
2023-06-16 13:20:32 +02:00

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