add QMakeOption::do_cache

... because qmake has it.

Change-Id: Idc2c9f6a041ff1d60d95e8a2ad400f7d41f3d2d2
Reviewed-by: Daniel Teske <daniel.teske@nokia.com>

src/shared/proparser/qmakeevaluator.cpp

@@ -914,6 +914,7 @@ QMakeEvaluator::VisitReturn QMakeEvaluator::visitProFile(
                 // ### init QMAKE_EXT_{C,H,CPP,OBJ}
                 // ### init TEMPLATE_PREFIX
 
+              if (m_option->do_cache) {
                 QString qmake_cache = m_option->cachefile;
                 if (qmake_cache.isEmpty() && !m_outputDir.isEmpty())  { //find it as it has not been specified
                     QDir dir(m_outputDir);
@@ -941,6 +942,7 @@ QMakeEvaluator::VisitReturn QMakeEvaluator::visitProFile(
                     }
                 }
                 m_option->cachefile = qmake_cache;
+              }
 
                 loadSpec();
 

src/shared/proparser/qmakeglobals.cpp

@@ -93,6 +93,8 @@ QMakeGlobals::QMakeGlobals()
 {
     initStatics();
 
+    do_cache = true;
+
 #ifdef Q_OS_WIN
     dirlist_sep = QLatin1Char(';');
     dir_sep = QLatin1Char('\\');

src/shared/proparser/qmakeglobals.h

@@ -56,6 +56,7 @@ public:
     QMakeGlobals();
     ~QMakeGlobals();
 
+    bool do_cache;
     QString dir_sep;
     QString dirlist_sep;
     QString qmakespec;