[PATCH] D149119: [CMake] Use llvm-nm to extract symbols for staged LTO builds on Windows

[Igor Kudrin via Phabricator via cfe-commits]

ikudrin added a comment.

In D149119#4312518 <https://reviews.llvm.org/D149119#4312518>, @simon_tatham wrote:

> Do LLVM's current portability goals include the constraint that you can only build LLVM for a platform it can also target? If not, then there surely still needs to be //some// kind of escape hatch so that you can avoid needing `llvm-nm` to already support the object file format of the host platform.
>
> I suppose you could say that in that unusual situation it's up to you to adapt `extract_symbols.py` so that it has some other way to get the answers.

If I understand it right, the main targets to use `extract_symbols.py` are AIX and Windows. For both these platforms `llvm-nm` and `llvm-readobj` can be built. Support for more exotic situations can be added relatively easily should it be required.


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