trans: Make names of internal symbols independent of CGU translation order #37328
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…order. Every codegen unit gets its own local counter for generating new symbol names. This makes bitcode and object files reproducible at the binary level even when incremental compilation is used.
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r? @nagisa (This should take care of a FIXME you added a while ago) |
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r=me (you’ll have to instruct bors yourself). I was kind of surprised about there only being 2 uses of gensym left. |
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@bors r=nagisa Thanks for the review! |
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📌 Commit 992203b has been approved by |
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…l-names, r=nagisa
trans: Make names of internal symbols independent of CGU translation order
Every codegen unit gets its own local counter for generating new symbol names. This makes bitcode and object files reproducible at the binary level even when incremental compilation is used.
The PR also solves a rare ICE resulting from a naming conflict between a user defined name and a generated one. E.g. try compiling the following program with 1.12.1 stable:
```rust
pub fn str7233() -> &'static str { "foo" }
```
This results in:
> error: internal compiler error: ../src/librustc_trans/common.rs:979: symbol `str7233` is already defined
Running into this is not very likely but it's also easily avoidable.
bors
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Every codegen unit gets its own local counter for generating new symbol names. This makes bitcode and object files reproducible at the binary level even when incremental compilation is used.
The PR also solves a rare ICE resulting from a naming conflict between a user defined name and a generated one. E.g. try compiling the following program with 1.12.1 stable:
This results in:
Running into this is not very likely but it's also easily avoidable.