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doc: update llvm based coverage example

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On some systems the old example of using xargs to pass list of profraw
files can exceed xargs's argument limit resulting in multiple executions
of llvm-profdata merge command which overwrites it's output file losing
coverage information. Switch to using a file with a list of filenames.
This commit is contained in:
Max Edwards
2026-04-24 15:55:16 -04:00
parent 2d5ab09f0d
commit ef21e29298
1 changed files with 2 additions and 1 deletions
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doc/developer-notes.md
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@@ -457,7 +457,8 @@ LLVM_PROFILE_FILE="$(pwd)/build/raw_profile_data/%m_%p.profraw" ctest --test-dir
LLVM_PROFILE_FILE="$(pwd)/build/raw_profile_data/%m_%p.profraw" build/test/functional/test_runner.py # Append "-j N" here for N parallel jobs
# Merge all the raw profile data into a single file
find build/raw_profile_data -name "*.profraw" | xargs llvm-profdata merge -o build/coverage.profdata
find build/raw_profile_data -name "*.profraw" > build/raw_profile_data_files.txt
llvm-profdata merge -f build/raw_profile_data_files.txt -o build/coverage.profdata
```
> **Note:** The "counter mismatch" warning can be safely ignored, though it can be resolved by updating to Clang 19.