fix: use Swift toolchain's llvm-cov for profraw conversion

Both host and Android SDK use the same nightly Swift snapshot
(DEVELOPMENT-SNAPSHOT-2025-12-15-a), so the host's llvm-cov from
$SWIFT_INSTALLATION/bin should be able to read the profraw files.

Changed from Android NDK's llvm-cov (which has version mismatch) to
the Swift toolchain's llvm-cov that matches the compiler.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <[email protected]>

Author: leogdion

.github/actions/swift-android-action/action.yml

@@ -599,21 +599,23 @@ runs:
           echo "  fi" >> ${SCRIPT_FILE}
           echo "done" >> ${SCRIPT_FILE}
 
-          # Convert profraw to LCOV using Android NDK's llvm-cov (matches Android clang version)
+          # Convert profraw to LCOV using Swift toolchain's llvm-cov (same nightly version)
           echo "echo '==> Converting profraw to LCOV format...'" >> ${SCRIPT_FILE}
           echo "if [ -f '${COVERAGE_DIR}/default.profraw' ]; then" >> ${SCRIPT_FILE}
           echo "  # Find the test binary" >> ${SCRIPT_FILE}
           echo "  TEST_BINARY=\$(find \${SWIFT_SDK_TARGET}/debug -name '*.xctest' | head -n 1)" >> ${SCRIPT_FILE}
           echo "  if [ -n \"\$TEST_BINARY\" ]; then" >> ${SCRIPT_FILE}
-          echo "    # Use Android NDK's llvm-cov which matches the Android clang version" >> ${SCRIPT_FILE}
-          echo "    NDK_LLVM_COV=\"\${ANDROID_NDK_HOME}/toolchains/llvm/prebuilt/linux-x86_64/bin/llvm-cov\"" >> ${SCRIPT_FILE}
-          echo "    if [ -f \"\$NDK_LLVM_COV\" ]; then" >> ${SCRIPT_FILE}
-          echo "      \"\$NDK_LLVM_COV\" export -format=lcov -instr-profile='${COVERAGE_DIR}/default.profraw' \"\$TEST_BINARY\" > '${COVERAGE_DIR}/coverage.lcov' 2>&1 || {" >> ${SCRIPT_FILE}
-          echo "        echo \"Warning: Failed to convert profraw to LCOV - LLVM version mismatch\"" >> ${SCRIPT_FILE}
+          echo "    # Use Swift toolchain's llvm-cov (matches the Swift compiler that generated profraw)" >> ${SCRIPT_FILE}
+          echo "    SWIFT_LLVM_COV=\"\${SWIFT_INSTALLATION}/bin/llvm-cov\"" >> ${SCRIPT_FILE}
+          echo "    if [ -f \"\$SWIFT_LLVM_COV\" ]; then" >> ${SCRIPT_FILE}
+          echo "      \"\$SWIFT_LLVM_COV\" export -format=lcov -instr-profile='${COVERAGE_DIR}/default.profraw' \"\$TEST_BINARY\" > '${COVERAGE_DIR}/coverage.lcov' 2>&1 && {" >> ${SCRIPT_FILE}
+          echo "        echo \"Successfully converted profraw to LCOV\"" >> ${SCRIPT_FILE}
+          echo "      } || {" >> ${SCRIPT_FILE}
+          echo "        echo \"Warning: Failed to convert profraw to LCOV\"" >> ${SCRIPT_FILE}
           echo "        echo \"Keeping profraw file for artifact upload\"" >> ${SCRIPT_FILE}
           echo "      }" >> ${SCRIPT_FILE}
           echo "    else" >> ${SCRIPT_FILE}
-          echo "      echo \"Warning: Android NDK llvm-cov not found at \$NDK_LLVM_COV\"" >> ${SCRIPT_FILE}
+          echo "      echo \"Warning: Swift llvm-cov not found at \$SWIFT_LLVM_COV\"" >> ${SCRIPT_FILE}
           echo "    fi" >> ${SCRIPT_FILE}
           echo "  else" >> ${SCRIPT_FILE}
           echo "    echo \"Warning: Test binary not found\"" >> ${SCRIPT_FILE}