refactor GitHub workflow and script: adjust LLVM coverage report paths for consistency and simplify file generation logic

Author: allnes

.github/workflows/ubuntu.yml

@@ -389,12 +389,12 @@ jobs:
             --llvm-profdata llvm-profdata-20 \
             --llvm-cov llvm-cov-20
           # Check if files were generated
-          ls -la coverage.lcov
+          ls -la build/coverage.lcov
           ls -la build/cov-report/
       - name: Upload coverage reports to Codecov
         uses: codecov/[email protected]
         with:
-          files: ./coverage.lcov
+          files: ./build/coverage.lcov
           verbose: true
           name: llvm-codecov
       - name: Upload coverage report artifact

scripts/generate_llvm_coverage.py

@@ -80,7 +80,8 @@ def generate_coverage_reports(
     subprocess.run(cmd, check=True)
 
     # Generate LCOV report
-    lcov_file = Path(output_dir).parent / "coverage.lcov"
+    # Place coverage.lcov in the current working directory (build dir)
+    lcov_file = Path("coverage.lcov")
     print(f"\nGenerating LCOV report: {lcov_file}")
     cmd = [
         llvm_cov, "export",