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.
Codecov ReportAll modified and coverable lines are covered by tests ✅
Additional details and impacted files@@ Coverage Diff @@
## main #2300 +/- ##
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- Coverage 30.91% 0 -30.92%
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Files 53 0 -53
Lines 20112 0 -20112
Branches 9755 0 -9755
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- Hits 6217 0 -6217
+ Misses 7922 0 -7922
+ Partials 5973 0 -5973 ☔ View full report in Codecov by Sentry. |
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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.