Added support for -excludeLibs command line option

This helps us avoid pesky libraries which are optional by the main
binary but may be dragged in by some other libraries like
https://github.com/probonopd/linuxdeployqt/issues/235

Usage: -exclude-libs=libqsqlibase,libqsqlodbc,libqsqlpsql,libqsqltds

tools/linuxdeployqt/main.cpp

@@ -82,6 +82,8 @@ int main(int argc, char **argv)
         qInfo() << "   -no-copy-copyright-files : Skip deployment of copyright files.";
         qInfo() << "   -extra-plugins=<list>    : List of extra plugins which should be deployed,";
         qInfo() << "                              separated by comma.";
+        qInfo() << "   -exclude-libs=<list>     : List of extra plugins which should be deployed,";
+        qInfo() << "                              separated by comma.";
         qInfo() << "   -version                 : Print version statement and exit.";
         qInfo() << "";
         qInfo() << "linuxdeployqt takes an application as input and makes it";
@@ -207,6 +209,7 @@ int main(int argc, char **argv)
     QStringList qmlDirs;
     QString qmakeExecutable;
     extern QStringList extraQtPlugins;
+    extern QStringList excludeLibs;
     extern bool copyCopyrightFiles;
 
     /* FHS-like mode is for an application that has been installed to a $PREFIX which is otherwise empty, e.g., /path/to/usr.
@@ -416,6 +419,10 @@ int main(int argc, char **argv)
             LogDebug() << "Argument found:" << argument;
             int index = argument.indexOf("=");
             extraQtPlugins = QString(argument.mid(index + 1)).split(",");
+        } else if (argument.startsWith("-exclude-libs=")) {
+            LogDebug() << "Argument found:" << argument;
+            int index = argument.indexOf("=");
+            excludeLibs = QString(argument.mid(index + 1)).split(",");
         } else if (argument.startsWith("-")) {
             LogError() << "Error: arguments must not start with --, only -" << "\n";
             return 1;

tools/linuxdeployqt/shared.cpp

@@ -58,6 +58,7 @@ int qtDetected = 0;
 bool qtDetectionComplete = 0; // As long as Qt is not detected yet, ldd may encounter "not found" messages, continue anyway
 bool deployLibrary = false;
 QStringList extraQtPlugins;
+QStringList excludeLibs;
 bool copyCopyrightFiles = true;
 
 using std::cout;
@@ -473,6 +474,7 @@ LibraryInfo parseLddLibraryLine(const QString &line, const QString &appDirPath,
         */
 
         QStringList excludelist;
+        excludelist += excludeLibs;
         excludelist << "libasound.so.2" << "libcom_err.so.2" << "libcrypt.so.1" << "libc.so.6" << "libdl.so.2" << "libdrm.so.2" << "libexpat.so.1" << "libfontconfig.so.1" << "libgcc_s.so.1" << "libgdk_pixbuf-2.0.so.0" << "libgio-2.0.so.0" << "libglib-2.0.so.0" << "libGL.so.1" << "libgobject-2.0.so.0" << "libgpg-error.so.0" << "libICE.so.6" << "libkeyutils.so.1" << "libm.so.6" << "libnsl.so.1" << "libnss3.so" << "libnssutil3.so" << "libp11-kit.so.0" << "libpangoft2-1.0.so.0" << "libpangocairo-1.0.so.0" << "libpango-1.0.so.0" << "libpthread.so.0" << "libresolv.so.2" << "librt.so.1" << "libSM.so.6" << "libstdc++.so.6" << "libusb-1.0.so.0" << "libuuid.so.1" << "libX11.so.6" << "libxcb.so.1" << "libz.so.1";
         LogDebug() << "excludelist:" << excludelist;
         if (! trimmed.contains("libicu")) {
@@ -666,6 +668,8 @@ QList<LibraryInfo> getQtLibrariesForPaths(const QStringList &paths, const QStrin
     QSet<QString> existing;
 
     foreach (const QString &path, paths) {
+        if (!excludeLibs.contains(QFileInfo(path).baseName()))
+        {
             foreach (const LibraryInfo &info, getQtLibraries(path, appDirPath, rpaths)) {
                 if (!existing.contains(info.libraryPath)) { // avoid duplicates
                     existing.insert(info.libraryPath);
@@ -673,6 +677,7 @@ QList<LibraryInfo> getQtLibrariesForPaths(const QStringList &paths, const QStrin
                 }
             }
         }
+    }
     return result;
 }
 
@@ -1394,6 +1399,8 @@ void deployPlugins(const AppDirInfo &appDirInfo, const QString &pluginSourcePath
     foreach (const QString &plugin, pluginList) {
         sourcePath = pluginSourcePath + "/" + plugin;
         destinationPath = pluginDestinationPath + "/" + plugin;
+        if(!excludeLibs.contains(QFileInfo(sourcePath).baseName()))
+        {
             QDir dir;
             dir.mkpath(QFileInfo(destinationPath).path());
             QList<LibraryInfo> libraries = getQtLibraries(sourcePath, appDirInfo.path, deploymentInfo.rpathsUsed);
@@ -1413,6 +1420,7 @@ void deployPlugins(const AppDirInfo &appDirInfo, const QString &pluginSourcePath
             copyCopyrightFile(sourcePath);
         }
     }
+}
 
 void createQtConf(const QString &appDirPath)
 {

tools/linuxdeployqt/shared.h

@@ -46,6 +46,7 @@ extern bool bundleAllButCoreLibs;
 extern bool fhsLikeMode;
 extern QString fhsPrefix;
 extern QStringList extraQtPlugins;
+extern QStringList excludeLibs;
 
 class LibraryInfo
 {