Always decompose nvcc compilations #2300
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…usted). Always decompose via `nvcc --dryrun`, then cache and report the host compiler call as a CUDA compilation
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trxcllnt
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Dec 21, 2024
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| Ok(( | ||
| command, | ||
| None, | ||
| // Never assume the outer `nvcc` call is cacheable. We must decompose the nvcc call into | ||
| // its constituent subcommands with `--dryrun` and only cache the final build product. | ||
| // | ||
| // Always decomposing `nvcc --dryrun` is the only way to ensure caching nvcc invocations | ||
| // is fully sound, because the `nvcc -E` preprocessor output is not sufficient to detect | ||
| // all source code changes. | ||
| // | ||
| // Specifically, `nvcc -E` always defines __CUDA_ARCH__, which means changes to host-only | ||
| // code guarded by an `#ifndef __CUDA_ARCH__` will _not_ be captured in `nvcc -E` output. | ||
| Cacheable::No, | ||
| )) |
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We might now be able to get away with doing less in the preprocess() function, since we effectively don't care about most of what it does.
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sccache 0.9.1 should be dealing with `nvcc -E` correctly see mozilla/sccache#2300 If this works as expected, we can get rid of this code: https://github.com/pytorch/pytorch/pull/142813/files Pull Request resolved: #145012 Approved by: https://github.com/malfet
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Never cache the outer CUDA compilation (because
nvcc -Ecan't be trusted).Always decompose via
nvcc --dryrun, then cache and report the host compiler call as a CUDA compilation.Fixes #2299.