message: Use for release builds
diff: @@ -38,7 +38,7 @@ buildMatrix = [
  // testing outside Jenkins, so we also explicitly schedule debug builds.
  ['Linux', [
  builds: ['release'],
  - tools: ['gcc', 'clang'],
  + tools: ['gcc8', 'clang'],
  cmakeArgs: releaseBuildFlags,
  ]],
  ['macOS', [
  