QbsProjectManager: Allow to switch on qbs profiling via env variable

We don't want to expose an option for this in the GUI, as the output is
not easily discoverable and the information is mostly interesting for
qbs developers.

Change-Id: I79a11e3ad12880b9862690cf18bdd3188aa9c03c
Reviewed-by: Jake Petroules <jake.petroules@qt.io>

src/plugins/qbsprojectmanager/qbsbuildstep.cpp

@@ -412,6 +412,7 @@ void QbsBuildStep::build()
     options.setChangedFiles(m_changedFiles);
     options.setFilesToConsider(m_changedFiles);
     options.setActiveFileTags(m_activeFileTags);
+    options.setLogElapsedTime(!qgetenv(Constants::QBS_PROFILING_ENV).isEmpty());
 
     QString error;
     m_job = qbsProject()->build(options, m_products, error);

src/plugins/qbsprojectmanager/qbsprojectmanagerconstants.h

@@ -65,5 +65,7 @@ const char QBS_FORCE_PROBES_KEY[] = "qbspm.forceProbes";
 static const char QBS_GROUP_ICON[] = ":/qbsprojectmanager/images/groups.png";
 static const char QBS_PRODUCT_OVERLAY_ICON[] = ":/qbsprojectmanager/images/productgear.png";
 
+const char QBS_PROFILING_ENV[] = "QTC_QBS_PROFILING";
+
 } // namespace Constants
 } // namespace QbsProjectManager

src/plugins/qbsprojectmanager/qbsprojectparser.cpp

@@ -109,6 +109,7 @@ void QbsProjectParser::parse(const QVariantMap &config, const Environment &env,
     params.setLibexecPath(libExecDirectory());
     params.setProductErrorMode(qbs::ErrorHandlingMode::Relaxed);
     params.setPropertyCheckingMode(qbs::ErrorHandlingMode::Relaxed);
+    params.setLogElapsedTime(!qgetenv(Constants::QBS_PROFILING_ENV).isEmpty());
 
     m_qbsSetupProjectJob = m_project.setupProject(params, QbsManager::logSink(), 0);