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Rebuild LLVM when it changed #54959

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Ekleog opened this issue Oct 10, 2018 · 2 comments · Fixed by #59303
Closed

Rebuild LLVM when it changed #54959

Ekleog opened this issue Oct 10, 2018 · 2 comments · Fixed by #59303
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A-docs Area: Documentation for any part of the project, including the compiler, standard library, and tools C-enhancement Category: An issue proposing an enhancement or a PR with one. P-medium Medium priority T-bootstrap Relevant to the bootstrap subteam: Rust's build system (x.py and src/bootstrap)

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@Ekleog
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Ekleog commented Oct 10, 2018

I've spent the past few hours looking through documentation for how to build rustc with a patched LLVM without success. Currently, the best I'm at is:

submodules = false
fast-submodules = false

And then build with:

./x.py build --stage 1 src/llvm src/libstd

But even that doesn't rebuild anything unless I rm -Rf build. Which completely loses incremental compilation results.

Is there any way to make this development workflow better? Rebuilding from scratch at every change is… painful.
@kennytm
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kennytm commented Oct 10, 2018 •
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You need to modify src/rustllvm/llvm-rebuild-trigger to rebuild LLVM.

(tagging this issue as a documentation problem.)

@kennytm kennytm added C-enhancement Category: An issue proposing an enhancement or a PR with one. T-bootstrap Relevant to the bootstrap subteam: Rust's build system (x.py and src/bootstrap) A-docs Area: Documentation for any part of the project, including the compiler, standard library, and tools labels Oct 10, 2018
@Ekleog
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Ekleog commented Oct 10, 2018

Thanks! Leaving open for the documentation problem :)

@steveklabnik steveklabnik added the P-medium Medium priority label Dec 27, 2018
@euclio euclio mentioned this issue Mar 19, 2019
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bors added a commit that referenced this issue Mar 29, 2019
@bors
Auto merge of #59303 - euclio:remove-rebuild-trigger, r=cuviper
2002b4b 
replace llvm-rebuild-trigger with submodule commit hash

As mentioned in #59285.

This PR removes the need to update the `llvm-rebuild-trigger` file. Instead, the latest commit hash of the appropriate LLVM submodule will be stored in the stamp file and used to detect if a build is required.

Fixes #42405.
Fixes #54959.
Fixes #55537.
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A-docs Area: Documentation for any part of the project, including the compiler, standard library, and tools C-enhancement Category: An issue proposing an enhancement or a PR with one. P-medium Medium priority T-bootstrap Relevant to the bootstrap subteam: Rust's build system (x.py and src/bootstrap)
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replace llvm-rebuild-trigger with submodule commit hash euclio/rust
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@steveklabnik @kennytm @Ekleog