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[bootstrap] Improve the error message when ninja is not found to link to installation instructions #89096

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Sep 22, 2021
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[bootstrap] Improve the error message when ninja is not found to link to installation instructions #89096

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[bootstrap] Improve the error message when `ninja` is not found to li…
daira Sep 19, 2021
23d6437
Restore the suggestion to set `ninja = false`.
daira Sep 19, 2021
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9 changes: 7 additions & 2 deletions src/bootstrap/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1494,8 +1494,13 @@ impl Build {
{
eprintln!(
"
Couldn't find required command: ninja
You should install ninja, or set `ninja=false` in config.toml in the `[llvm]` section.
Couldn't find required command: ninja (or ninja-build)

You should install ninja as described at
<https://github.com/ninja-build/ninja/wiki/Pre-built-Ninja-packages>,
or set `ninja = false` in the `[llvm]` section of `config.toml`.
Alternatively, set `download-ci-llvm = true` in that `[llvm]` section
to download LLVM rather than building it.
"
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I don't think this last suggestion is great - it might be useful in addition to suggesting ninja = false, but it shouldn't replace it altogether.

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Adding "ninja = false" didn't actually do anything as far as I could see. Is it working properly?

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It should be working ok. I think an issue is that if you run x.py once with the wrong ninja, then that gets cached in CMakeCache.txt, and then if you set ninja=false, the cached setup remains. Did you delete the llvm directory after changing the configuration? If not, then I suspect that is the cause.

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Yes that's consistent with what I saw. What can we do to improve that?

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I changed it to include both suggestions.

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What can we do to improve that?

Sorry, I'm not too familiar with cmake. I would maybe look at removing CMakeCache.txt at the beginning of the build, but would need to check with the regular llvm developers if that would cause a problem.

);
std::process::exit(1);
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