From: Steve Langasek <steve.langasek@ubuntu.com>
Date: Tue, 22 Aug 2023 13:42:24 +0000 (+0100)
Subject: include legacy pre-multiarch plugin paths
X-Git-Tag: archive/raspbian/4%4.8.7+dfsg-18+rpi1+deb10u2^2~18
X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=9d57d81dcdd352abf9ed4254ebd70332af144838;p=qt4-x11.git

include legacy pre-multiarch plugin paths

Last-Update: 2012-04-25

A full multiarch system requires an architecture-qualified plugin path for
Qt, but installed systems may still have plugins (e.g., from other
distribution packages) in another pre-multiarch directory.  When constructing
the plugin path, include both the configured plugin path and a plugin path
with the architecture triplet stripped out.

This applies to the general plugin loading system, and to the QML one.

Gbp-Pq: Name qt-multiarch-plugin-path-compat.diff
---

diff --git a/src/corelib/kernel/qcoreapplication.cpp b/src/corelib/kernel/qcoreapplication.cpp
index 83956dd83..ab5889dc6 100644
--- a/src/corelib/kernel/qcoreapplication.cpp
+++ b/src/corelib/kernel/qcoreapplication.cpp
@@ -2531,6 +2531,23 @@ QStringList QCoreApplication::libraryPaths()
             if (!app_libpaths->contains(installPathPlugins))
                 app_libpaths->append(installPathPlugins);
         }
+        QString pathSep("/");
+        QStringList dirnames = QString(installPathPlugins).split(QLatin1Char('/'), QString::SkipEmptyParts);
+        if (dirnames[0] == QLatin1String("usr") && dirnames[1] == QLatin1String("lib") && dirnames[3] == QLatin1String("qt4"))
+        {
+            QString legacyPathPlugins = pathSep;
+            int i = 0;
+            for (QStringList::const_iterator it = dirnames.constBegin(); it != dirnames.constEnd(); ++it) {
+                if (++i == 3)
+                    continue;
+                legacyPathPlugins = legacyPathPlugins + QString(*it) + pathSep;
+            }
+            if (QFile::exists(legacyPathPlugins)) {
+                legacyPathPlugins = QDir(legacyPathPlugins).canonicalPath();
+                if (!app_libpaths->contains(legacyPathPlugins))
+                    app_libpaths->append(legacyPathPlugins);
+            }
+        }
 #endif
 
         // If QCoreApplication is not yet instantiated,
diff --git a/src/declarative/qml/qdeclarativeimport.cpp b/src/declarative/qml/qdeclarativeimport.cpp
index 26ac527f1..e09691e1d 100644
--- a/src/declarative/qml/qdeclarativeimport.cpp
+++ b/src/declarative/qml/qdeclarativeimport.cpp
@@ -770,6 +770,22 @@ QDeclarativeImportDatabase::QDeclarativeImportDatabase(QDeclarativeEngine *e)
         addImportPath(installImportsPath);
     }
 #else
+    QStringList dirnames = installImportsPath.split(QLatin1Char('/'), QString::SkipEmptyParts);
+    if (dirnames[0] == QLatin1String("usr") && dirnames[1] == QLatin1String("lib") && dirnames[3] == QLatin1String("qt4"))
+    {
+        QString pathSep("/");
+        QString legacyImportPath = pathSep;
+        int i = 0;
+        for (QStringList::const_iterator it = dirnames.constBegin(); it != dirnames.constEnd(); ++it) {
+            if (++i == 3)
+                continue;
+            legacyImportPath = legacyImportPath + *it + pathSep;
+        }
+        if (QFile::exists(legacyImportPath)) {
+            addImportPath(legacyImportPath);
+        }
+    }
+
     addImportPath(installImportsPath);
 #endif