QMake: Add option to set qt.conf file

Change-Id: Ie5db11892ccf2d357773a4db6a0464bf27be9a26
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@theqtcompany.com>
(cherry picked from qtbase/dbf1c2eb9f4e1feb24a58699b7b550016802e386)
Reviewed-by: Jake Petroules <jake.petroules@qt.io>

src/shared/proparser/qmakeevaluator.cpp

@@ -1006,6 +1006,8 @@ void QMakeEvaluator::loadDefaults()
         vars[ProKey("QMAKE_QMAKE")] << ProString(m_option->qmake_abslocation);
     if (!m_option->qmake_args.isEmpty())
         vars[ProKey("QMAKE_ARGS")] = ProStringList(m_option->qmake_args);
+    if (!m_option->qtconf.isEmpty())
+        vars[ProKey("QMAKE_QTCONF")] = ProString(m_option->qtconf);
     vars[ProKey("QMAKE_HOST.cpu_count")] = ProString(QString::number(idealThreadCount()));
 #if defined(Q_OS_WIN32)
     vars[ProKey("QMAKE_HOST.os")] << ProString("Windows");

src/shared/proparser/qmakeglobals.cpp

@@ -103,7 +103,7 @@ QString QMakeGlobals::cleanSpec(QMakeCmdLineParserState &state, const QString &s
 QMakeGlobals::ArgumentReturn QMakeGlobals::addCommandLineArguments(
         QMakeCmdLineParserState &state, QStringList &args, int *pos)
 {
-    enum { ArgNone, ArgConfig, ArgSpec, ArgXSpec, ArgTmpl, ArgTmplPfx, ArgCache } argState = ArgNone;
+    enum { ArgNone, ArgConfig, ArgSpec, ArgXSpec, ArgTmpl, ArgTmplPfx, ArgCache, ArgQtConf } argState = ArgNone;
     for (; *pos < args.count(); (*pos)++) {
         QString arg = args.at(*pos);
         switch (argState) {
@@ -128,6 +128,9 @@ QMakeGlobals::ArgumentReturn QMakeGlobals::addCommandLineArguments(
         case ArgCache:
             cachefile = args[*pos] = QDir::cleanPath(QDir(state.pwd).absoluteFilePath(arg));
             break;
+        case ArgQtConf:
+            qtconf = args[*pos] = QDir::cleanPath(QDir(state.pwd).absoluteFilePath(arg));
+            break;
         default:
             if (arg.startsWith(QLatin1Char('-'))) {
                 if (arg == QLatin1String("-after"))
@@ -138,6 +141,8 @@ QMakeGlobals::ArgumentReturn QMakeGlobals::addCommandLineArguments(
                     do_cache = false;
                 else if (arg == QLatin1String("-cache"))
                     argState = ArgCache;
+                else if (arg == QLatin1String("-qtconf"))
+                    argState = ArgQtConf;
                 else if (arg == QLatin1String("-platform") || arg == QLatin1String("-spec"))
                     argState = ArgSpec;
                 else if (arg == QLatin1String("-xplatform") || arg == QLatin1String("-xspec"))

src/shared/proparser/qmakeglobals.h

@@ -103,6 +103,7 @@ public:
     QString qmake_abslocation;
     QStringList qmake_args;
 
+    QString qtconf;
     QString qmakespec, xqmakespec;
     QString user_template, user_template_prefix;
     QString precmds, postcmds;