commit b58af75ce35f81f575068f3ce54f1912bfae122b
Author: Adam Piatyszek <adam_piatyszek@mentor.com>
Date:   Wed Sep 18 09:28:57 2019 +0100

    QCommandLineParser: allow overriding the default executable in usage
    
    Implement setApplicationExecutable(const QString&) method to override
    the default executable name used by helpText().
    
    Change-Id: I5ef695219978b6f56b9a94198a25fe6f6c9c0696

diff --git a/src/corelib/tools/qcommandlineparser.cpp b/src/corelib/tools/qcommandlineparser.cpp
index 279d6565da..ed1d275f47 100644
--- a/src/corelib/tools/qcommandlineparser.cpp
+++ b/src/corelib/tools/qcommandlineparser.cpp
@@ -60,7 +60,8 @@ class QCommandLineParserPrivate
 {
 public:
     inline QCommandLineParserPrivate()
-        : singleDashWordOptionMode(QCommandLineParser::ParseAsCompactedShortOptions),
+        : executable(QCoreApplication::instance()->arguments().constFirst()), // default executable name
+          singleDashWordOptionMode(QCommandLineParser::ParseAsCompactedShortOptions),
           optionsAfterPositionalArgumentsMode(QCommandLineParser::ParseAsOptions),
           builtinVersionOption(false),
           builtinHelpOption(false),
@@ -100,6 +101,9 @@ public:
     //! Application description
     QString description;
 
+    //! Application executable name
+    QString executable;
+
     //! Documentation for positional arguments
     struct PositionalArgumentDefinition
     {
@@ -456,6 +460,25 @@ QString QCommandLineParser::applicationDescription() const
     return d->description;
 }
 
+/*!
+    Sets the application \a executable shown by helpText().
+*/
+void QCommandLineParser::setApplicationExecutable(const QString &executable)
+{
+    d->executable = executable;
+}
+
+/*!
+    Returns the application \a executable name used by helpText().
+
+    If no custom application \a executable was set with setApplicationExecutable(),
+    the absolute path to the default executable will be returned.
+*/
+QString QCommandLineParser::applicationExecutable() const
+{
+    return d->executable;
+}
+
 /*!
     Defines an additional argument to the application, for the benefit of the help text.
 
@@ -1105,8 +1128,7 @@ QString QCommandLineParserPrivate::helpText() const
 {
     const QLatin1Char nl('\n');
     QString text;
-    QString usage;
-    usage += QCoreApplication::instance()->arguments().constFirst(); // executable name
+    QString usage = executable; // executable name
     if (!commandLineOptionList.isEmpty())
         usage += QLatin1Char(' ') + QCommandLineParser::tr("[options]");
     for (const PositionalArgumentDefinition &arg : positionalArgumentDefinitions)
diff --git a/src/corelib/tools/qcommandlineparser.h b/src/corelib/tools/qcommandlineparser.h
index 4584c384cc..9b7ce87a57 100644
--- a/src/corelib/tools/qcommandlineparser.h
+++ b/src/corelib/tools/qcommandlineparser.h
@@ -78,6 +78,8 @@ public:
     QCommandLineOption addHelpOption();
     void setApplicationDescription(const QString &description);
     QString applicationDescription() const;
+    void setApplicationExecutable(const QString &executable);
+    QString applicationExecutable() const;
     void addPositionalArgument(const QString &name, const QString &description, const QString &syntax = QString());
     void clearPositionalArguments();