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Having this set to true disrupts compiler development workflows for people who use `llvm.download-ci-llvm = true`
because we don't provide ci-llvm on the `rustc-alt-builds` server. Therefore, it is kept off by default.
Signed-off-by: onur-ozkan <work@onurozkan.dev>
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This profile originally made sense when download-ci-llvm = if-unchanged
didn't exist and we had the bad tradeoff of "never modify or always
compile".
Thankfully, these grim times are over and we have discovered clean
water, so the only differentiator between the two profiles is the
codegen profile having LLVM assertions. Adding them doesn't cause that
much of a slowdown, <10% on UI tests from an unscientific benchmark.
It also had LLVM warnings when compiling, which makes sense for every
compiler contributor brave enough to compile LLVM.
The way I removed is by just issueing a nice error message. Given that
everyone with this profile should be a contributor and not someone like
a distro who is more upset when things break, this should be fine.
If it isn't, we can always fall back to just letting codegen mean
compiler.
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This is very helpful for profiling. I've hacked this in many times, so
let's add it properly.
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Signed-off-by: onur-ozkan <work@onurozkan.dev>
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If there's an ICE while bootstrapping, it's most likely because of a change to the compiler.
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Otherwise no one will be able to find the setting.
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