diff options
| -rw-r--r-- | src/tools/moc/preprocessor.cpp | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/src/tools/moc/preprocessor.cpp b/src/tools/moc/preprocessor.cpp index 590f17c24f..a47896d722 100644 --- a/src/tools/moc/preprocessor.cpp +++ b/src/tools/moc/preprocessor.cpp @@ -1222,6 +1222,10 @@ Symbols Preprocessor::preprocessed(const QByteArray &filename, QFile *file) // phase 3: preprocess conditions and substitute macros Symbols result; + // Preallocate some space to speed up the code below. + // The magic value was found by logging the final size + // and calculating an average when running moc over FOSS projects. + result.reserve(file->size() / 300000); preprocess(filename, result); mergeStringLiterals(&result); |