Switch default backend from 'fastcomp' to 'upstream' #373
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Before we land this we should have docs probably, but I'm not sure where? |
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Actually, maybe we could have the emsdk say something? Like show a message, "the default backend has changed" on first run after the change? |
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Good idea. Added a bit notice. |
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Looks good, thanks! |
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In offline discussion we had the idea to maybe not always default to upstream, but just from 1.39.0 and onwards. The idea being that say at a version from last year, upstream's support was not that great yet, so it would be bad. Only at 1.39.0 are we confident the new backend is good enough for general use. Let's discuss more and decide next week. |
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Updated so that we now only default for upstream for 'latest' and for 1.39.0 and above. |
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When users as for 'latest' or just '1.39.0' we now default to the upstream llvm backend. For versions before 1.39.0 we continue to default to fastcomp. Fixes: emscripten-core/emscripten#5488
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| if arg in ('latest', 'sdk-latest', 'latest-64bit', 'sdk-latest-64bit', 'latest-fastcomp', 'latest-releases-fastcomp'): | ||
| if arg in ('latest', 'sdk-latest', 'latest-64bit', 'sdk-latest-64bit'): | ||
| # This is effectly the default SDK | ||
| report_upstream_by_default() |
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I think we can report this only if the version is high enough? Can maybe share code with the existing check later down.
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The version check make sense below, but here we know that we want to unconditionally select upstream right? We never want latest to point to fastcomp ever again, do we? And if we do we would revert this code.
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🎉🎉🎉 |
Enable SxS manifests for workloads
When users as for 'latest' or just '1.39.0' we now default to the upstream llvm backend.
For versions before 1.39.0 we continue to default to fastcomp.
Fixes: emscripten-core/emscripten#5488