QtMocScanner: construct file tags only once

The FileTag c'tor hashes its string argument.
Avoid doing this over and over again in a hot code path.

Change-Id: I91cbe246621f4643c1a81d805440f4729d65cbb7
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>

1 files changed, 2 insertions, 0 deletions

diff --git a/src/lib/corelib/buildgraph/qtmocscanner.h b/src/lib/corelib/buildgraph/qtmocscanner.h
index 806ec1f7b..e7d034b16 100644
--- a/src/lib/corelib/buildgraph/qtmocscanner.h
+++ b/src/lib/corelib/buildgraph/qtmocscanner.h
@@ -58,6 +58,7 @@ namespace qbs {
 namespace Internal {
 
 class Artifact;
+struct CommonFileTags;
 
 class QtMocScanner
 {
@@ -72,6 +73,7 @@ private:
     static QScriptValue js_apply(QScriptContext *ctx, QScriptEngine *engine, void *data);
     QScriptValue apply(QScriptEngine *engine, const Artifact *artifact);
 
+    const CommonFileTags &m_tags;
     const ResolvedProductPtr &m_product;
     QScriptValue m_targetScriptValue;
     const Logger &m_logger;