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codegen-units setting in Cargo.toml causes LLVM error with nightly-i686-pc-windows-msvc #36309

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codegen-units setting in Cargo.toml causes LLVM error with nightly-i686-pc-windows-msvc#36309
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michaelwoerister
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A-codegenArea: Code generationE-needs-testCall for participation: An issue has been fixed and does not reproduce, but no test has been added.O-windowsOperating system: WindowsP-mediumMedium priorityT-compilerRelevant to the compiler team, which will review and decide on the PR/issue.regression-from-stable-to-nightlyPerformance or correctness regression from stable to nightly.

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@Boscop
Boscop
opened on Sep 6, 2016

Using the latest nightly rustc 1.13.0-nightly (cbe4de78e 2016-09-05) I'm getting this error on a project that uses euclid which uses xml-rs:
LLVM ERROR: assembler label 'L__ehtable$_ZN3xml6reader6parser10MarkupData13take_ encoding17hb15412b3bac19ec7E' can not be undefined error: Could not compile xml-rs.
This happens only when I have codegen-units = 4 in my Cargo.toml and only with the 32bit version of the toolchain, only with nightly-i686-pc-windows-msvc not with nightly-x86_64-pc-windows-msvc.
(I tested 4 configs: with/without codegen-units = 4 in Cargo.toml ⨯ 32/64 bit)

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A-codegenArea: Code generationE-needs-testCall for participation: An issue has been fixed and does not reproduce, but no test has been added.O-windowsOperating system: WindowsP-mediumMedium priorityT-compilerRelevant to the compiler team, which will review and decide on the PR/issue.regression-from-stable-to-nightlyPerformance or correctness regression from stable to nightly.

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