bugfix: Kill compile processes that generates too much output #2883
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cmaglie
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Codecov ReportAttention: Patch coverage is
Additional details and impacted files@@ Coverage Diff @@
## master #2883 +/- ##
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Coverage 67.83% 67.84%
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Files 238 238
Lines 22419 22442 +23
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+ Hits 15209 15226 +17
- Misses 6010 6014 +4
- Partials 1200 1202 +2
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This patch fixes how process are killed on MacOS and Windows
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alessio-perugini
approved these changes
Apr 30, 2025
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UPGRADING.mdhas been updated with a migration guide (for breaking changes)configuration.schema.jsonupdated if new parameters are added.What kind of change does this PR introduce?
Previously, compiling a sketch containing an include loop could generate a lot of output and crash the Arduino CLI with an out-of-memory error. This is due to the library-discovery process that buffers the stderr output of the compiler for analysis after the process exits.
To fix this problem, a limit to the compiler output has been set to 100KB of data.
What is the current behavior?
The process never terminates, and it's killed for OOM later by the kernel.
What is the new behavior?
Does this PR introduce a breaking change, and is titled accordingly?
A legitimate sketch may produce a lot of warnings from a single file, going over 100KB. In that extreme case, the sketch could not be compiled anymore with Arduino CLI.
100KB looks like a reasonable limit. By the way, there are no specific stats available about this, so we have to deploy this fix, get feedback from the user, and be ready to increase this limit if needed.
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