Add error handling for stderrno when errno is invalid #25762
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sbc100
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Nov 10, 2025
google-yfyang
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sbc100
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Nov 11, 2025
sbc100
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sbc100
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sbc100
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Nov 11, 2025
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It looks this does come at a codesize cost. It is a very small one so maybe fine. Can you run |
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Done. |
sbc100
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Nov 11, 2025
| "a.out.js": 245483, | ||
| "a.out.nodebug.wasm": 574056, | ||
| "total": 819539, | ||
| "a.out.nodebug.wasm": 573907, |
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How did this one get smaller?? Strange.
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possibly heavy optimization takes the return "Unknown error" branch and avoids the more complicated
s = (char *)&errmsgstr + errmsgidx[e];?
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This is to match llvm-libc's behavior when an invalid errno is specified.
When errno is specified as -1, for instance, the current behavior prints "Success". With this change, any invalid errno emits out "Unknown error %d".