MaskRay wrote:

> I don't really understand the rationale for this, and it's kind of annoying. 
> Most of the compiler's flags behave in the "last one wins" fashion (such as 
> `-O2` and `-O0`) and it's always been convenient to add the flag you want at 
> the end. Why treat action flags any differently? Also, even if this is 
> worthwhile for some reason I haven't considered, why is it an error rather 
> than a warning?

@bogner Some action options are shared between driver and cc1 but the behaviors 
could be quite different. See my example in the description.

```
%clang_cc1 -S -emit-llvm a.c     # -S is overridden
%clang_cc1 -emit-llvm -S a.c     # -emit-llvm is overridden
%clang_cc1 -fsyntax-only -S a.c  # -fsyntax-only is overridden
```

The strictness helps ensure that `%clang_cc1` tests do not have misleading, 
overridden action options.

https://github.com/llvm/llvm-project/pull/91140
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