[PATCH] D89942: Disable LTO and LLD for bootstrap builds on systems unsupported by LLD

[Timm Bäder via Phabricator via cfe-commits]

tbaeder added a comment.

In D89942#2629146 <https://reviews.llvm.org/D89942#2629146>, @beanz wrote:

> If we know SystemZ + LLD + LTO is a bad configuration, "fixing" the configuration and logging a message seems like the wrong move when the only way to get into that state is to specifically request options.

But that's not true. The `3-stage-base.cmake` sets `BOOTSTRAP_LLVM_ENABLE_LTO` to `ON`, which doesn't work on SystemZ. This is the initial problem I had. I was not interested in having LTO enabled or not, but the cache enables it and that breaks on SystemZ.

> It seems to me, your intent is to make the stage3 build work for SystemZ, and that seems like something we should accomplish entirely inside the stage3 CMake caches.

I vaguely remember trying to do all this in the `3-stage-base.cmake` but things like `LLVM_NATIVE_ARCH` etc. are not available in there, I am not sure if the previous `if(APPLE)` check was working either.


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https://reviews.llvm.org/D89942