simonpcook wrote:

I think the fake flag hack may have a limitation in that since the 
`--XXX-fake-flag-...` appears in `--print-multi-lib` it may get imported into 
some build system and used as a flag for building particular libraries. For 
example with the above, newlib will not build since `error: unknown argument: 
'--XXX-fake-flag-yaml-has-m'`.

Of course, I can build newlib with a different multilib.yaml file that I later 
distribute the tools with - more an FYI for anyone who hits that one in the 
future.

https://github.com/llvm/llvm-project/pull/98856
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