support platforms that does not have QProcess support (iOS)

python/core/auto_generated/qgsmaprenderertask.sip.in

@@ -26,8 +26,12 @@ task. This can be used to draw maps without blocking the QGIS interface.
 
     enum ErrorType
     {
+      //! Image allocation failure
       ImageAllocationFail,
-      ImageSaveFail
+      //! Image save failure
+      ImageSaveFail,
+
+      ImageUnsupportedFormat
     };
 
     QgsMapRendererTask( const QgsMapSettings &ms,

python/core/auto_generated/qgsrunprocess.sip.in

@@ -17,6 +17,9 @@ class QgsRunProcess: QObject /NoDefaultCtors/
 A class that executes an external program/script.
 It can optionally capture the standard output and error from the
 process and displays them in a dialog box.
+
+On some platforms (e.g. iOS) , the process execution is skipped
+https://lists.qt-project.org/pipermail/development/2015-July/022205.html
 %End
 
 %TypeHeaderCode
@@ -26,16 +29,15 @@ process and displays them in a dialog box.
 
     static QgsRunProcess *create( const QString &action, bool capture ) /Factory/;
 
+  private:
+    QgsRunProcess( const QString &action, bool capture );
+    ~QgsRunProcess();
   public slots:
     void stdoutAvailable();
     void stderrAvailable();
     void processError( QProcess::ProcessError );
     void processExit( int, QProcess::ExitStatus );
     void dialogGone();
-
-  private:
-    QgsRunProcess( const QString &action, bool capture );
-    ~QgsRunProcess();
 };
 
 /************************************************************************

src/core/qgsapplication.cpp

@@ -61,6 +61,7 @@
 #include <QMessageBox>
 #include <QPalette>
 #include <QProcess>
+#include <QProcessEnvironment>
 #include <QIcon>
 #include <QPixmap>
 #include <QThreadPool>
@@ -270,7 +271,9 @@ void QgsApplication::init( QString profileFolder )
   // store system environment variables passed to application, before they are adjusted
   QMap<QString, QString> systemEnvVarMap;
   QString passfile( QStringLiteral( "QGIS_AUTH_PASSWORD_FILE" ) ); // QString, for comparison
-  Q_FOREACH ( const QString &varStr, QProcess::systemEnvironment() )
+
+  const auto systemEnvironment = QProcessEnvironment::systemEnvironment().toStringList();
+  for ( const QString &varStr : systemEnvironment )
   {
     int pos = varStr.indexOf( QLatin1Char( '=' ) );
     if ( pos == -1 )
@@ -947,7 +950,7 @@ QString QgsApplication::userLoginName()
     sUserName = QString( name );
   }
 
-#else
+#elseif QT_CONFIG(process)
   QProcess process;
 
   process.start( QStringLiteral( "whoami" ) );

src/core/qgsrunprocess.cpp

@@ -26,6 +26,7 @@
 #include <QTextCodec>
 #include <QMessageBox>
 
+#if QT_CONFIG(process)
 QgsRunProcess::QgsRunProcess( const QString &action, bool capture )
 
 {
@@ -162,3 +163,13 @@ void QgsRunProcess::processError( QProcess::ProcessError err )
     QgsDebugMsg( "Got error: " + QString( "%d" ).arg( err ) );
   }
 }
+#else
+QgsRunProcess::QgsRunProcess( const QString &action, bool )
+{
+  QgsDebugMsg( "Skipping command: " + action );
+}
+
+QgsRunProcess::~QgsRunProcess()
+{
+}
+#endif

src/core/qgsrunprocess.h

@@ -28,12 +28,14 @@
 #include "qgis_sip.h"
 
 class QgsMessageOutput;
-
 /**
  * \ingroup core
  * A class that executes an external program/script.
  * It can optionally capture the standard output and error from the
  * process and displays them in a dialog box.
+ *
+ * On some platforms (e.g. iOS) , the process execution is skipped
+ * https://lists.qt-project.org/pipermail/development/2015-July/022205.html
  */
 class CORE_EXPORT QgsRunProcess: public QObject SIP_NODEFAULTCTORS
 {
@@ -50,23 +52,25 @@ class CORE_EXPORT QgsRunProcess: public QObject SIP_NODEFAULTCTORS
     static QgsRunProcess *create( const QString &action, bool capture ) SIP_FACTORY
     { return new QgsRunProcess( action, capture ); }
 
-  public slots:
-    void stdoutAvailable();
-    void stderrAvailable();
-    void processError( QProcess::ProcessError );
-    void processExit( int, QProcess::ExitStatus );
-    void dialogGone();
-
   private:
     QgsRunProcess( const QString &action, bool capture ) SIP_FORCE;
     ~QgsRunProcess() override SIP_FORCE;
 
+#if QT_CONFIG(process)
     // Deletes the instance of the class
     void die();
 
     QProcess *mProcess = nullptr;
     QgsMessageOutput *mOutput = nullptr;
     QString mCommand;
+
+public slots:
+    void stdoutAvailable();
+    void stderrAvailable();
+    void processError( QProcess::ProcessError );
+    void processExit( int, QProcess::ExitStatus );
+    void dialogGone();
+#endif // !(QT_CONFIG(process)
 };
 
 #endif

src/core/qgsuserprofilemanager.cpp

@@ -196,6 +196,7 @@ QgsUserProfile *QgsUserProfileManager::userProfile()
 
 void QgsUserProfileManager::loadUserProfile( const QString &name )
 {
+#if QT_CONFIG(process)
   QString path = QDir::toNativeSeparators( QCoreApplication::applicationFilePath() );
   QStringList arguments;
   arguments << QCoreApplication::arguments();
@@ -203,10 +204,13 @@ void QgsUserProfileManager::loadUserProfile( const QString &name )
   // on Windows this might not be case so we need to handle that
   // http://doc.qt.io/qt-5/qcoreapplication.html#arguments
   arguments.removeFirst();
-
   arguments << QStringLiteral( "--profile" ) << name;
   QgsDebugMsg( QStringLiteral( "Starting instance from %1 with %2" ).arg( path ).arg( arguments.join( " " ) ) );
   QProcess::startDetached( path, arguments, QDir::toNativeSeparators( QCoreApplication::applicationDirPath() ) );
+#else
+  Q_UNUSED( name )
+  Q_ASSERT( "Starting the user profile is not supported on the platform" );
+#endif //QT_CONFIG(process)
 }
 
 void QgsUserProfileManager::setActiveUserProfile( const QString &profile )